WO2019061434A1 - Method for detecting wavelength deviation, and sink node - Google Patents

Abstract

The invention relates to a method for detecting a wavelength difference, and a collector node. The method comprises: acquiring a wavelength division multiplexing signal; according to the wavelength division multiplexing signal, acquiring information relating to a pilot signal in each optical signal; and according to the information relating to the pilot signal in each optical signal, determining wavelength deviation information relating to a transmitter for sending each optical signal. The method of the present invention improves the wavelength deviation information detection efficiency, and real-time monitoring of a wavelength deviation.

Description

Method for detecting wavelength deviation and convergence node Technical field

The present application relates to communication technologies, and in particular, to a method and a convergence node for detecting wavelength deviation.

Background technique

With the popularity of high-definition video services and the demand for 5G bearer networks, the traffic of metropolitan area networks has exploded. Taking Dense Wavelength Division Multiplexing (DWDM) in a metropolitan area network as an example, the DWDM system has a fixed 50 GHz channel spacing (the channel refers to a channel for transmitting optical signals in a DWDM system). The wavelength deviation or frequency offset of the optical signal transmitted by the optical transmitter in the system is between [-2.5 GHz, +2.5 GHz].

In order to improve the wavelength stability of the optical signal transmission in the DWDM system, the prior art uses the wavelength control device shown in FIG. 1 to filter out the optical signals in different channels one by one by using the adjustable band pass filter in the device. Then, wavelength control adjustment operations are respectively performed for the optical signals of each channel one by one. The wavelength control adjustment operation specifically includes: transmitting the optical signal to the broadband wavelength locking device, and performing signal processing of the signal processor to obtain wavelength deviation information when each optical transmitter emits the optical signal, and then the signal processor will obtain The wavelength deviation information is provided to the controller, and the controller adjusts the wavelength of the transmitted light of the transmitter that transmits the optical signal according to the wavelength deviation information.

However, when the system has 80 or more channels, for example, when the system is an Ultra Dense Wavelength Division Multiplexing (UDWDM), the wavelength deviation of each optical transmitter is determined by the above wavelength control method. The efficiency of the information is low, which affects the adjustment efficiency of the wavelength of the transmitted light of the optical transmitter, and the real-time performance of the wavelength monitoring of the system is poor.

Summary of the invention

The present invention provides a method for detecting wavelength deviation and a convergence node, which solves the technical problem that the detection efficiency of the wavelength deviation information of the optical transmitter in the prior art is low, and the real-time performance of the wavelength monitoring of the system is poor.

In a first aspect, an embodiment of the present application provides a method for detecting a wavelength deviation, including:

Acquiring a wavelength division multiplexed signal, the wavelength division multiplexed signal includes optical signals of at least two wavelengths, and the optical signals of different wavelengths carry pilot signals of different frequencies;

Obtaining information of a pilot signal in each optical signal according to the wavelength division multiplexed signal; the information of the pilot signal includes a frequency of the pilot signal;

The wavelength deviation information of the transmitter transmitting each optical signal is determined based on the information of the pilot signals in each optical signal.

In the method provided by the first aspect, the sink node obtains the wavelength division multiplexed signal, and combines the wavelength division multiplexed signal to obtain information of the pilot signal in each optical signal in the wavelength division multiplexed signal, and then according to each light The information of the pilot signals in the signal determines the wavelength deviation information of the transmitter of each transmitted optical signal. In the method of this embodiment, the sink node determines the light of each optical signal in parallel by synchronously determining the information of the pilot signals of each optical signal. The wavelength deviation information of the transmitter does not need to detect the wavelength deviation one by one for each optical signal. Therefore, the detection efficiency of the wavelength deviation information in the embodiment is high, and real-time monitoring of the wavelength deviation is realized.

In a possible design, the information of the pilot signal includes: the information of the pilot signal further includes: amplitude information of the pilot signal.

The method provided by the possible design uses the amplitude information of the pilot signal and the frequency of the pilot signal to determine the wavelength deviation information of each transmitter transmitting the optical signal, and the determining manner is simple, thereby further improving the detection of the wavelength deviation information. effectiveness

In a possible design, the foregoing information about acquiring a pilot signal in each optical signal according to the wavelength division multiplexed signal includes:

The wavelength division multiplexed signal is photoelectrically converted to obtain information of a pilot signal in each of the wavelength division multiplexed signals.

In a possible design, the obtaining the wavelength division multiplexing signal includes:

The pilot signals of different frequencies are used to modulate the optical signals emitted by different optical transmitters of the convergence node to obtain at least two first optical signals; wherein different first optical signals carry pilot signals of different frequencies;

Performing a wavelength division multiplexing operation on the at least two first optical signals to obtain a first wavelength division multiplexed signal.

In a possible design, the above-mentioned photoelectric conversion of the wavelength division multiplexed signal to obtain the information of the pilot signal in each of the wavelength division multiplexed signals includes:

Performing a power splitting operation on the first wavelength division multiplexed signal to obtain a first multiplexed signal and a second multiplexed signal; the first multiplexed signal and the second multiplexed signal each include at least two first optical signals, the first complex The signal is the same as the first optical signal included in the second multiplexed signal;

Performing photoelectric conversion on the first multiplexed signal to obtain a first electrical signal corresponding to the first multiplexed signal, and performing a first operation on each of the first multiplexed signals to obtain each first light a first amplitude of the pilot signal in the signal, the first operation comprising: determining, according to a frequency of the pilot signal in the first optical signal, an amplitude of the first electrical signal at a frequency of the pilot signal as a guide in the first optical signal The first amplitude of the frequency signal;

Processing the second multiplexed signal to the wavelength reference device, and photoelectrically converting the optical signal output by the wavelength reference device to obtain a second electrical signal corresponding to the second multiplexed signal, and for the second multiplexed signal Performing a second operation for each first optical signal to obtain a second amplitude of the pilot signal of each first optical signal, the second operation comprising: determining the second electrical quantity according to a frequency of the pilot signal in the first optical signal The amplitude of the signal at the frequency of the pilot signal is the second amplitude of the pilot signal in the first optical signal;

For each first optical signal, an operation is performed to determine an amplitude change value of the pilot signal in the first optical signal based on the first amplitude and the second amplitude of the pilot signal in the first optical signal.

In a possible design, the wavelength deviation information of the optical transmitter that transmits each optical signal is determined according to the information of the pilot signal in each optical signal, which specifically includes:

For each of the first optical signals, the following operations are performed: according to the amplitude change value of the pilot signal in the first optical signal, and the amplitude change value of the pilot signal in the first optical signal and the power change of the first optical signal The proportional relationship of the values determines the first wavelength deviation information of the optical transmitter transmitting the first optical signal in the sink node.

The method provided by each of the above possible designs, the aggregation node modulates the optical signals emitted by different optical transmitters in the convergence node by using pilot signals of different frequencies to obtain at least two first optical signals, and at least two Performing a wavelength division multiplexing operation on the first optical signal to obtain a first wavelength division multiplexed signal, based on the first wavelength division multiplexing signal The aggregation node performs a power splitting operation on the first multiplexed signal and the second multiplexed signal, and separately processes the first multiplexed signal and the second multiplexed signal to obtain each first optical signal. Determining a first amplitude and a second amplitude of the pilot signal, and determining a magnitude of the pilot signal in each of the first optical signals based on the first amplitude and the second amplitude of the pilot signal in each of the first optical signals And changing a value, and determining a first wavelength deviation information of each optical transmitter that transmits the first optical signal in the convergence node according to a proportional relationship between the amplitude change value and a power variation value of the first optical signal. In this embodiment, for the amplitude change value of each first optical signal, the convergence nodes are all acquired in parallel. Therefore, when the first wavelength deviation information of each first optical signal is determined, the convergence node is also acquired in parallel, so In this embodiment, the parallel detection of the wavelength deviation is realized, the detection efficiency of the wavelength deviation information is improved, and real-time monitoring of the wavelength deviation is realized.

In a possible design, the above method further includes:

And adjusting, according to the first wavelength deviation information, a wavelength of a transmission light of the optical transmitter that transmits the first optical signal in the aggregation node.

The method provided by the possible design adjusts the wavelength of the transmitted light of the optical transmitter that transmits the first optical signal in the convergence node by using the first wavelength deviation information determined in the foregoing, and the adjustment precision is high, and the interference between the optical signals is avoided.

In a possible design, the obtaining the wavelength division multiplexing signal includes:

Receiving a second wavelength division multiplexed signal formed by the second optical signal sent by the at least one access node; wherein the second optical signal is sent by the access node to the optical transmitter of the access node by using the pilot signal of the corresponding frequency The optical signal is modulated, and the different second optical signals carry pilot signals of different frequencies.

In a possible design, the above-mentioned photoelectric conversion of the wavelength division multiplexed signal to obtain the information of the pilot signal in each of the wavelength division multiplexed signals includes:

Performing photoelectric conversion on the second wavelength division multiplexed signal to obtain a modulated electrical signal corresponding to the second wavelength division multiplexed signal;

Band-pass filtering the modulated electrical signal to obtain an electrical signal corresponding to each second optical signal, wherein the electrical signal corresponding to each second optical signal carries a pilot signal in the second optical signal, and each second The electrical signal corresponding to the optical signal includes two DC component signals;

For each electrical signal corresponding to the second optical signal, performing an operation of: determining a frequency of the pilot signal in the second optical signal according to a frequency difference between the two DC component signals in the electrical signal; wherein the two DC component signals The frequency difference is equal to twice the frequency of the pilot signal.

In a possible design, the wavelength deviation information of the optical transmitter that transmits each optical signal is determined according to the information of the pilot signal in each optical signal, which specifically includes:

For each second optical signal, do the following:

Determining an intermediate frequency point of the two DC component signals according to a frequency of the pilot signal in the second optical signal and a frequency of two DC component signals on the electrical signal corresponding to the second optical signal;

Determining the difference between the intermediate frequency point and the frequency of the optical signal emitted by the local oscillator source of the sink node;

And determining, according to the frequency and the difference of the pilot signals, second wavelength deviation information of the transmitter in the access node that transmits the second optical signal including the pilot signal.

The method provided by each of the foregoing possible designs, the access node loads the pilot signals of different frequencies by using different uplink optical signals sent by the internal optical transmitters, thereby obtaining second optical signals of different wavelengths, based on different wavelengths. The second optical signal forms a second wavelength division multiplexed signal, and sends the second wavelength division multiplexed signal to the convergence node; the convergence node photoelectrically converts the second wavelength division multiplexed signal to obtain a second wave division Signal corresponding Modulating an electrical signal, and band-pass filtering the modulated electrical signal to obtain an electrical signal corresponding to each second optical signal, and then determining each electrical signal corresponding to each frequency signal based on a frequency difference between the two DC component signals on each electrical signal The frequency of the pilot signal in the second optical signal, thereby determining the difference between the frequency of the pilot signal and the frequency of the optical signal emitted by the local oscillator source of the sink node, and determining the access node based on the difference Second wavelength deviation information of the transmitter transmitting the second optical signal. In this embodiment, when the access node has no wave lock, the wavelength deviation or the frequency offset may be detected by the coherent reception of the sink node, and the access node receives the frequency offset information or the second wavelength deviation information, and according to the The information adjusts the wavelength of the transmitted light at the access node to achieve wavelength stability control. In addition, the sink node obtains the second wavelength deviation information corresponding to each second optical signal in parallel. Therefore, the wavelength is implemented in this embodiment. The parallel detection of the deviation improves the detection efficiency of the wavelength deviation information and realizes real-time monitoring of the wavelength deviation.

In a possible design, the above method further includes:

Transmitting the second wavelength deviation information to the access node, so that the access node adjusts the transmit light wavelength of the optical transmitter that transmits the second optical signal in the access node according to the second wavelength deviation information.

The possible design provides a method for detecting the wavelength deviation or the frequency offset by the coherent reception of the sink node in the case that the access node has no wave lock, and the frequency offset information or the second wavelength deviation is received by the access node. The information is adjusted according to the information to adjust the wavelength of the transmitted light at the access node to achieve wavelength stability control, and the detection cost of the wavelength control is also reduced.

In a second aspect, in order to implement the method for detecting a wavelength deviation in the first aspect, the embodiment of the present application provides an optical communication network element, where the optical communication network element is a convergence node, where the aggregation node has the foregoing detection wavelength. The function of the deviation method. The functions may be implemented by hardware or by corresponding software implemented by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

In a possible implementation manner of the second aspect, the convergence node includes a plurality of functional modules or units for implementing the method for detecting a wavelength deviation in any of the foregoing first aspects.

In another possible implementation manner of the second aspect, the structure of the sink node may include a processor and a transceiver, and may further include: a modulator, a wavelength division multiplexer, a beam splitter, a photodetector, and a filter. And wavelength reference devices such as wave locks. The processor is configured to support a corresponding function of the method in which the sink node performs any of the first aspects of detecting the wavelength offset. The transceiver is configured to support communication between the sink node and the access node, such as a light emitting and optical receiver. The sink node may also include a memory for coupling with the processor, which stores program instructions and data necessary for the method for detecting the wavelength deviation by the sink node.

In a third aspect, an embodiment of the present application provides a computer storage medium for storing computer software instructions used by a processor of the aggregation node, which includes a program designed to execute the foregoing first aspect.

In a fourth aspect, the embodiment of the present application provides a computer program product, where the computer program product includes a computer program, which can implement the detection provided by the foregoing embodiment of the present application when being read and executed by a processor or other type of chip. The method of wavelength deviation. The beneficial effects and specific working principles of the computer program product are referred to the foregoing embodiments, and are not described herein again.

In a fifth aspect, the embodiment of the present application further provides a communication system, where the system includes a sink node and at least one access node; wherein, the sink node is configured to perform the foregoing first aspect and each possible design of the first aspect. The method provided.

Compared with the prior art, the method for detecting wavelength deviation and the convergence node provided by the present application, the sink node acquires a wavelength division multiplexed signal, and combines the wavelength division multiplexed signal to obtain each optical signal in the wavelength division multiplexed signal. The information of the pilot signal is then determined based on the information of the pilot signal in each optical signal, and the wavelength deviation information of each transmitter transmitting the optical signal. In the method of the embodiment, the sink node determines the wavelength deviation information of the optical transmitter of each optical signal in parallel by synchronously determining the information of the pilot signals of each optical signal, which does not need to be performed one by one for each optical signal. The wavelength deviation is detected in the order, and therefore, the detection efficiency of the wavelength deviation information in the present embodiment is high, and real-time monitoring of the wavelength deviation is realized.

DRAWINGS

1 is a schematic structural diagram of a wavelength control apparatus in a DWDM system in the prior art provided by the present application;

2 is a schematic diagram of a network architecture provided by the present application;

3 is a schematic flow chart of Embodiment 1 of a method for detecting wavelength deviation provided by the present application;

4 is a schematic flow chart of Embodiment 2 of a method for detecting wavelength deviation provided by the present application;

FIG. 5 is a schematic structural diagram 1 of a pilot-based wavelength locking device provided by the present application; FIG.

6 is a schematic structural diagram 2 of a pilot-based wavelength locking device provided by the present application;

FIG. 7 is a schematic flowchart of acquiring information of a pilot signal in each first optical signal in a first wavelength division multiplexed signal by a sink node according to the present application;

8 is a schematic structural diagram of a wavelength locking module provided by the present application;

9 is a schematic diagram showing relationship between power variation values and frequency deviations provided by the present application;

10 is a schematic flowchart of Embodiment 3 of a method for detecting wavelength deviation provided by the present application;

11 is a schematic structural diagram of an access node provided by the present application;

12 is a schematic diagram of an electrical signal corresponding to a second optical signal provided by the present application;

FIG. 13 is a schematic structural diagram of Embodiment 1 of a convergence node provided by the present application;

FIG. 14 is a schematic structural diagram of Embodiment 2 of a convergence node provided by the present application;

15 is a schematic structural diagram of Embodiment 3 of a convergence node provided by the present application;

FIG. 16 is a schematic structural diagram of Embodiment 4 of a convergence node provided by the present application.

Detailed ways

The method for detecting the wavelength deviation provided by the present application can be applied to the network architecture diagram shown in FIG. 2. As shown in FIG. 2, the network may include a sink node and at least one access node. The traffic or services of all the access nodes are aggregated to the aggregation node, and the aggregation node is connected to each access node by using the optical wavelength. Each access node may contain one or more optical transceivers of different wavelengths. The sum of the number of wavelengths of light emitted by all access nodes is equal to the number of wavelengths of light at the sink node. Optionally, the network architecture shown in FIG. 1 may be a DWDM system, or may be a UDWDM system, which is not limited in this embodiment.

It should be noted that the channel involved in this embodiment refers to a channel for transmitting an optical signal transmitted by an optical transmitter. Different channels have different wavelengths or different frequencies, and optical signals of different wavelengths or different frequencies (the frequency of the optical signal=the speed of the light/the wavelength of the optical signal) transmitted by the optical transmitter are transmitted in different channels.

In the current wavelength control method, generally, the adjustable band pass filter in the wavelength control device shown in FIG. 1 is utilized. The wave filter filters out the optical signals in different channels one by one, and then performs wavelength control adjustment operations for the optical signals of each channel one by one. However, when the system has a large number of channels, the wavelength control method for determining the wavelength deviation information of each optical signal is low, thereby affecting the adjustment efficiency of the wavelength of the transmitted light of the optical transmitter, and the real-time performance of the wavelength monitoring of the system is poor. . Therefore, the method for detecting wavelength deviation provided by the present application aims to solve the above technical problems of the prior art.

It should be understood that although the terms first, second, third, etc. may be used in this application to describe certain features (assuming features are represented by XXX), these terms are only used to distinguish certain features from one another. For example, the first XXX may also be referred to as a second XXX without departing from the scope of the embodiments of the present application. Similarly, the second XXX may also be referred to as a first XXX.

The technical solutions of the present application are described in detail below with specific embodiments. The following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be described in some embodiments.

FIG. 3 is a schematic flowchart diagram of Embodiment 1 of a method for detecting wavelength deviation provided by the present application. Optionally, the execution entity of the method embodiment may be a sink node, and may also be other devices having the function of the sink node in this application. The following embodiments are described by taking the execution subject as a sink node as an example. In this embodiment, the sink node obtains the information of the pilot signal in each optical signal in the wavelength division multiplexed signal by analyzing the wavelength division multiplexed signal, thereby determining the light emission of the transmitted optical signal based on the information of the pilot signal. The specific process of the wavelength deviation information of the machine (or light source, laser). As shown in FIG. 3, the method includes the following steps:

S101: The convergence node acquires a wavelength division multiplexing signal, where the wavelength division multiplexing signal includes optical signals of at least two wavelengths, and the optical signals of different wavelengths carry pilot signals of different frequencies.

Specifically, in this embodiment, the wavelength division multiplexing signal obtained by the aggregation node may be a first wavelength division multiplexing signal obtained by the convergence node combining the first optical signal sent by the optical transmitter inside the aggregation node, The second wavelength division multiplexing signal formed by the second optical signal sent by the at least one access node received by the aggregation node may also be the wavelength division multiplexing signal obtained by the aggregation node by other means, which is in this embodiment. The manner in which the sink node obtains the wavelength division multiplexed signal is not limited, as long as the acquired wavelength division multiplexed signal includes at least two wavelengths of optical signals, and the optical signals of different wavelengths carry the pilot signals of different frequencies.

S102: The sink node acquires information of a pilot signal in each optical signal according to the wavelength division multiplexing signal, where the information of the pilot signal includes a frequency of the pilot signal.

Optionally, after receiving the wavelength division multiplexed signal, the sink node may perform parsing or photoelectric conversion processing on the wavelength division multiplexed signal, convert the wavelength division multiplexed signal in the optical domain into an electrical signal in the electrical domain, and then The information of the pilot signal of each optical signal in the wavelength division multiplexed signal is acquired based on an operation of analyzing and filtering the electrical signal.

Optionally, the information of the pilot signal may include a frequency of the pilot signal. Optionally, the information of the pilot signal may include a direct frequency value of the pilot signal, and may also include a pilot signal and a certain frequency. The frequency difference of the signal. Optionally, the information of the pilot signal may include amplitude information of the pilot signal in addition to the frequency of the pilot signal. Optionally, the amplitude information of the pilot signal may be a direct amplitude value of the pilot signal, or may be a amplitude change value of the pilot signal in different processing modes, or may be a pilot signal and a certain amplitude frequency are known. The amplitude difference of the signal.

S103: The sink node determines, according to information of the pilot signal in each optical signal, wavelength deviation information of a transmitter that transmits each of the optical signals.

Specifically, after the sink node obtains the information of the pilot signal in each optical signal, each of the information may be combined The relationship between the information of the pilot signal of the optical signal and the power of the optical transmitter to transmit the optical signal determines the wavelength deviation information of each optical transmitter that transmits the optical signal, and optionally, each transmission is also determined Frequency deviation information of the optical signal. Alternatively, the wavelength deviation information of each transmitter transmitting the optical signal may be determined by combining the relationship between the information of the pilot signal and the frequency or amplitude of the local oscillator source in the convergence node.

Optionally, the wavelength deviation information may be wavelength deviation information of the optical signal of the optical transmitter in the aggregation node, or may be wavelength deviation information of the optical signal of the optical transmitter in the access node, where the wavelength deviation information is specifically The optical transmitter of the sink node is also the optical transmitter of the access node, which is determined by the manner of the wavelength division multiplexed signal acquired by the sink node. For example, when the wavelength division multiplexed signal acquired by the sink node is the first wavelength division multiplexed signal formed by the first optical signal sent by the plurality of optical transmitters of the sink node, the wavelength deviation information determined by the sink node is aggregated. Wavelength deviation information of the optical transmitter in the node; when the convergence node acquires the second wavelength division multiplexing signal formed by the second optical signal sent by the at least one access node, the wavelength deviation information determined by the convergence node is Wavelength deviation information of the optical transmitter in the ingress node.

It can be seen from the above description that, in the embodiment, when the convergence node determines the wavelength deviation information of the optical signal, the wavelength deviation information of each optical signal is determined based on the synchronization and synchronization of the pilot signals of each optical signal, which is not targeted Each optical signal is determined one by one and in order. Therefore, the detection efficiency of the wavelength deviation information in the present embodiment is high, and real-time monitoring of the wavelength deviation is realized.

The method for detecting a wavelength deviation provided by the present application, the sink node acquires a wavelength division multiplexed signal, and combines the wavelength division multiplexed signal to obtain information of a pilot signal in each optical signal in the wavelength division multiplexed signal, and then according to each The information of the pilot signals in the optical signals determines the wavelength deviation information of the transmitters of each of the transmitted optical signals. In the method of the embodiment, the sink node determines the wavelength deviation information of the optical transmitter of each optical signal in parallel by synchronously determining the information of the pilot signals of each optical signal, which does not need to be performed one by one for each optical signal. The wavelength deviation is detected in the order, and therefore, the detection efficiency of the wavelength deviation information in the present embodiment is high, and real-time monitoring of the wavelength deviation is realized.

FIG. 4 is a schematic flowchart diagram of Embodiment 2 of a method for detecting wavelength deviation provided by the present application. FIG. 5 is a schematic structural diagram 1 of a pilot-based wavelength locking apparatus provided by the present application, and FIG. 6 is a schematic structural diagram 2 of a pilot-based wavelength locking apparatus provided by the present application. In this embodiment, when the wavelength division multiplexing signal acquired by the sink node is a multiplexed signal formed by the optical signal sent by the optical transmitter of the sink node, the sink node obtains the wavelength deviation of the optical signal transmitted by the optical transmitter of the sink node. An optional implementation of information. As shown in FIG. 4, the method may include:

S201: The aggregation node modulates the optical signals sent by different optical transmitters in the convergence node by using pilot signals of different frequencies to obtain at least two first optical signals. The different first optical signals carry different frequencies. Pilot signal.

Referring to FIG. 5, the apparatus includes at least two pilot generating modules (assuming PT1 . . . PTn respectively), at least one optical transmitter (assuming semiconductor lasers LD1 . . . LDn respectively), a modulator, and wavelength division multiplexing. The device, the wavelength locking module, the pilot extraction analysis module, and optionally, may also include a controller (eg, an FPGA). Wherein each optical transmitter is connected to a corresponding modulator, each optical transmitter is also connected to a wavelength division multiplexer (or a combiner), the wavelength division multiplexer is connected to the wavelength locking module, and the wavelength locking module is connected via a signal. The processing module is connected to the pilot extraction analysis module, which is respectively connected to the LD1...LDn through a controller (for example, an FPGA). The difference between FIG. 6 and FIG. 5 is mainly in the optical transmitter. The optical transmitter in FIG. 6 is used as both the transmitting source of the transmitting end and the local oscillator source of the receiving end signal, that is, the integrated coherent receiver of FIG. 6 (Integrated coherent). Receiver (ICR) is a device used by a sink node to receive an optical signal from an external node. The ICR can receive an optical signal from an external node and receive a part of the optical signal separated by a laser diode (LD). The two optical signals are mixed and output. CH ₁ ... CH _n in Fig. 5 and Fig. 6 are signal output channels modulated by a modulator for a part of the optical signal of the LD output.

In conjunction with the apparatus shown in FIG. 5 and FIG. 6, the sink node generates a pilot signal by using a pilot generation module, which is: a first pilot signal generated by PT1 (frequency f1), and a second pilot signal generated by PT2 (frequency) The nth pilot signal (frequency fn) generated for f2), ..., PTn; the optical transmitters inside the convergence node respectively transmit respective optical signals, and the optical signals emitted by each optical transmitter have different frequencies or wavelengths. As shown in FIG. 5 and FIG. 6, the aggregation node modulates the optical signal transmitted by the LD1 by using the first pilot signal generated by the PT1 to obtain a first optical signal carrying the first pilot signal. Similarly, the PTn is generated. The nth pilot signal modulates the optical signal transmitted by the LDn to obtain a first optical signal carrying the nth pilot signal. Based on this, the sink node can obtain at least two first optical signals, and the first optical signals of different wavelengths carry pilot signals of different frequencies.

Optionally, in the above FIG. 5 and FIG. 6, an optical transmitter can transmit an optical signal, and can also send multiple optical signals, that is, one optical transmitter can transmit optical signals of multiple wavelengths (when an optical transmitter only When an optical signal is sent, the sink node includes at least two optical transmitters, and the sink node modulates different optical signals with pilot signals of different frequencies, so that the sink node can also obtain at least two first optical signals. That is to say, if an optical transmitter generates only one optical signal, it can be modulated by only one pilot signal, but the method is also applicable to a super-dense wavelength division multiplexing (UDWDM) system with a wavelength channel spacing of less than 50 GHz. Each optical transmitter in the system can generate a plurality of optical signals, and then generate a plurality of first optical signals in the optical domain by modulation of pilot signals of different frequencies.

S202: The aggregation node performs a wavelength division multiplexing operation on the at least two first optical signals to obtain a first wavelength division multiplexing signal.

Specifically, after the sink node obtains at least two first optical signals, optionally, a device such as a splitter inside the optical transmitter may be used to divide each of the first optical signals into a modulator for modulation and pass. The wavelength channel outputs the modulated optical signal, and another portion of each of the first optical signals is sent to the wavelength division multiplexer for wavelength division multiplexing operation to obtain a first wavelength division multiplexed signal.

It should be noted that S201 and S202 in this embodiment are an optional implementation manner of S101 in the first embodiment.

S203: The aggregation node performs photoelectric conversion on the first wavelength division multiplexed signal to obtain information of a pilot signal in each of the first optical multiplexing signals.

Optionally, in combination with the foregoing FIG. 5 and FIG. 6, the sink node may convert the first wavelength division multiplexed signal into an electrical signal, where the electrical signal includes at least two pilot signals, based on the processing of the electrical signal. The information of the pilot signal in each of the first optical signals can be obtained. Optionally, the information of the pilot signal may be a frequency of the pilot signal and amplitude information of the pilot signal. Optionally, as an optional implementation manner of S203, the S203 may include the steps shown in FIG. 7:

S203a: The aggregation node performs a power splitting operation on the first wavelength division multiplexed signal to obtain a first multiplexed signal and a second multiplexed signal; the first multiplexed signal and the second multiplexed signal both include at least Two first light letters No. The first multiplexed signal and the first optical signal included in the second multiplexed signal are the same.

Optionally, the sink node may perform power splitting operation on the first wavelength division multiplexed signal according to power, and split the first wavelength division multiplexed signal to obtain a first multiplexed signal and a second multiplexed signal of different powers. It should be noted that the first optical signal included in the first multiplexed signal and the first optical signal included in the second multiplexed signal are the same. For example, the first multiplexed signal includes four first lights of A, B, C, and D. Signal, A carries the first pilot signal with frequency f1, B carries the second pilot signal with frequency f2, C carries the third pilot signal with frequency f3, and D carries the fourth frequency with f4 The pilot signal, then the second multiplexed signal also includes the above four first optical signals A, B, C, and D. This power splitting operation can be performed by the wavelength locking module of FIGS. 5 and 6 described above.

S203b: performing photoelectric conversion on the first multiplexed signal to obtain a first electrical signal corresponding to the first multiplexed signal, and performing a first operation on each of the first multiplexed signals Obtaining a first amplitude of a pilot signal in each first optical signal, the first operation comprising: determining, according to a frequency of a pilot signal in the first optical signal, the first electrical signal in the The amplitude at the frequency of the pilot signal is the first amplitude of the pilot signal in the first optical signal.

As shown in FIG. 5 and FIG. 6 above, the first multiplexed signal and the second multiplexed signal respectively enter different branches in the wavelength locking module for subsequent processing. For the first multiplexed signal, the sink node directly performs photoelectric conversion on the first multiplexed signal by using the photodetection diode (PD1) in the wavelength locking module to obtain a first electrical signal corresponding to the first multiplexed signal (the first electrical signal) For one). The sink node then performs a first operation on each of the first multiplexed signals to obtain a first amplitude of the pilot signals in each of the first optical signals. Taking the first optical signal A as exemplified in S203a as an example, the sink node determines the amplitude of the first electrical signal at f1 according to the frequency f1 of the pilot signal in the A signal, thereby obtaining the pilot signal in the A signal. A magnitude. Similarly, for the three first optical signals B, C, and D in S203a, the first operation is also performed, thereby obtaining the first amplitude of the pilot signal in the B signal and the first pilot signal in the C signal. The amplitude, and the first amplitude of the pilot signal in the D signal.

S203c: performing processing by transmitting the second multiplexed signal to a wavelength reference device, and performing photoelectric conversion on the optical signal output by the wavelength reference device to obtain a second electrical signal corresponding to the second multiplexed signal, and Performing a second operation on each of the first multiplexed signals to obtain a second amplitude of the pilot signal of each of the first optical signals, the second operation comprising: according to the first The frequency of the pilot signal in the optical signal determines the amplitude of the second electrical signal at the frequency of the pilot signal as the second amplitude of the pilot signal in the first optical signal.

Specifically, for the second multiplexed signal, the sink node processes the second multiplexed signal in advance by using a wavelength reference device in the wavelength locking module, and transmits the optical signal output by the wavelength reference device to the PD2 in the wavelength locking module. Performing photoelectric conversion to obtain a second electrical signal corresponding to the second multiplexed signal (the second electrical signal is one). Then, the sink node performs a second operation on each of the first multiplexed signals to obtain a first amplitude of the pilot signal of each of the first multiplexed signals. Taking the first optical signal A as exemplified in S203a as an example, the sink node determines the amplitude of the second electrical signal at f1 according to the frequency f1 of the pilot signal in A, thereby obtaining the pilot signal in the A signal. Two amplitudes. Similarly, for the three first optical signals B, C, and D in S203a, a second operation is also performed, thereby obtaining a second amplitude of the pilot signal in the B signal and a second pilot signal in the C signal. The amplitude, and the second amplitude of the pilot signal in the D signal.

Optionally, the wavelength reference device may be a wave lock. Optionally, the wave lock may be an etalon wave lock, or may be other wave locks, which is not limited in this embodiment.

It can be seen from the descriptions of S203b and S203c that the first multiplexed signal and the second multiplexed signal are respectively processed by two different processes in the wavelength locking module, so that the amplitudes of the pilot signals in the first optical signal of the same wavelength are different. For example, continuing to combine the example given in S203a, taking the A signal in the first multiplexed signal and the second multiplexed signal as an example, the A signal in the first multiplexed signal and the A signal in the second multiplexed signal are The first optical signal of the same wavelength, the A signal is processed by S203b, and the amplitude of the pilot signal (f1) in the obtained A signal is M1, and the A signal is processed by S203c, and the pilot signal in the obtained A signal (f1) The magnitude of this is M2.

S203d: for each first optical signal, performing an operation of: determining, according to the first amplitude and the second amplitude of the pilot signal in the first optical signal, a change in amplitude of the pilot signal in the first optical signal value.

Based on the processes of S203a to S203c, the sink node may obtain a first amplitude and a second amplitude of the pilot signal in each of the first optical signals, and then, for each first optical signal, the sink node may be based on the first optical signal. The first amplitude and the second amplitude of the pilot signal in the obtained amplitude variation value of the pilot signal in each of the first optical signals. Taking the first optical signal A as mentioned above as an example, the A signal is processed by S203b, and the amplitude of the pilot signal (f1) in the obtained A signal is M1, and the A signal is processed by S203c, and the obtained A signal is The amplitude of the pilot signal (f1) is M2, and the sink node obtains the amplitude change value of the pilot signal in the A signal as ∣M1-M2∣ based on the M1 and M2. Similarly, the operations of S203d are also performed for the three first optical signals B, C, and D in S203a, and the amplitude change values of the pilot signals in each of the first optical signals are obtained.

Optionally, the process of S203d may be performed by the signal processing module shown in FIG. 5 and FIG. 6 above.

S204: The sink node determines, according to information of the pilot signal in each of the first optical signals in the first wavelength division multiplexed signal, wavelength deviation information of the optical transmitter that transmits each first optical signal.

Optionally, the process of S204 may be performed by the pilot extraction analysis module shown in FIG. 5 and FIG. 6 above. Optionally, since the first multiplexed signal and the second multiplexed signal enter the wavelength locking module and perform two different processes, the same first optical signal in the first multiplexed signal and the second multiplexed signal enters After the wavelength locking module, the power of the first optical signal outputted through the first path of the wavelength locking module is different from the power of the first optical signal outputted through the second path of the wavelength locking module. In addition, the change of the optical power of the first optical signal causes a corresponding change in the amplitude of the pilot signal carried by the first optical signal, that is, the amplitude change value of the pilot signal in the first optical signal and the first optical signal. The power change values have a proportional relationship between each other. Therefore, the sink node can determine the optical power change value of each first optical signal according to the amplitude change value of the pilot signal in each of the first optical signals, and then based on each The optical power variation values of the first optical signals obtain first wavelength deviation information or frequency deviation information of the optical transmitters that transmit each of the first optical signals in the convergence node. It should be noted that, for each amplitude change value of the first optical signal, the convergence nodes are acquired in parallel. Therefore, when the first wavelength deviation information of each first optical signal is determined, the convergence node is also acquired in parallel, so In this embodiment, the detection efficiency of the wavelength deviation information is improved, and real-time monitoring of the wavelength deviation is realized.

The following is a simple example to illustrate the amplitude change value of the pilot signal according to the pilot signal in each first optical signal, and the amplitude change value of the pilot signal in each first optical signal and the first optical signal. The proportional relationship of the power change values determines the first wavelength deviation information of the optical transmitter transmitting each of the first optical signals in the sink node. Taking the A signal in the first multiplexed signal and the second multiplexed signal as an example, refer to the internal structure diagram of the wavelength locking module shown in FIG.

As shown in FIG. 8, the wavelength locking module includes two paths, which are a straight path (including only the photodetection diode PD1) and a non-straight path (including an etalon wave lock and a photodetection diode PD2), and the A signal passes through a straight path. After processing, the first amplitude of the pilot signal in the A signal is M1, and after the A signal is processed through the non-straight path, the second amplitude of the pilot signal in the A signal is M2. In addition, the modulation depth of the pilot signal is set to m, the responsiveness of PD1 and PD2 is R, then there is the following relationship: M = k × P × m × R, where k is a constant and M is the amplitude of the pilot signal. Based on the formula, the optical power P1 of the A signal passing through the straight path and the optical power P2 of the A signal passing through the non-straight path can be separately calculated, thereby obtaining the power variation value of the ∣P1-P2∣.

Further, in conjunction with the relationship between the power variation value and the frequency deviation shown in FIG. 9, the abscissa in FIG. 9 is the frequency deviation, and the ordinate is the power variation value. As can be seen from Fig. 9, the result of ∣P1-P2∣ has a linear characteristic (as indicated by the broken line in Fig. 9), and based on Fig. 9 and the obtained values of ∣P1-P2∣, the value of the abscissa can be calculated, thereby The frequency offset information of the A signal is obtained, and based on the frequency offset information, the first wavelength deviation information when the optical transmitter transmits the A signal can be obtained.

Optionally, after the convergence node obtains the wavelength deviation information corresponding to each of the first optical signals, the wavelength of the transmission light of the optical transmitter that sends the first optical signal in the aggregation node may be adjusted according to each of the first wavelength deviation information. Optionally, the pilot extraction analysis module in the aggregation node may transmit the wavelength deviation information corresponding to each first optical signal to a controller (for example, an FPGA), where the controller adjusts each of the convergence nodes to send the first optical signal. The wavelength of the transmitted light of the optical transmitter.

The method for detecting a wavelength deviation provided by the present application, the convergence node modulates an optical signal emitted by different optical transmitters in the convergence node by using pilot signals of different frequencies to obtain at least two first optical signals, and at least The two first optical signals perform a wavelength division multiplexing operation to obtain a first wavelength division multiplexed signal, and based on the first wavelength division multiplexed signal, the sink node performs a power splitting operation thereon to obtain a first multiplexed signal and a second Multiplexing the signals, and respectively performing different processing on the first multiplexed signal and the second multiplexed signal to obtain a first amplitude and a second amplitude of the pilot signal in each of the first optical signals, and then according to each first a first amplitude and a second amplitude of the pilot signal in the optical signal, determining an amplitude variation value of the pilot signal in each of the first optical signals, and proportional to the power variation value of the first optical signal according to the amplitude variation value A relationship determining first wavelength deviation information of each of the optical transmitters transmitting the first optical signal in the sink node. In this embodiment, for the amplitude change value of each first optical signal, the convergence nodes are all acquired in parallel. Therefore, when the first wavelength deviation information of each first optical signal is determined, the convergence node is also acquired in parallel, so In this embodiment, the parallel detection of the wavelength deviation is realized, the detection efficiency of the wavelength deviation information is improved, and real-time monitoring of the wavelength deviation is realized.

The foregoing embodiment 2 mainly describes how the aggregation node detects the wavelength deviation information when the optical transmitter transmits the optical signal inside the aggregation node. The following third embodiment mainly describes how the aggregation node detects the optical transmitter transmitting the optical signal inside the access node. Wavelength deviation information. In the access node, the frequency of the wave lock is actually equal to the spacing of the channel spacing. When facing a UDWDM system with channel spacing less than 50 GHz, for example, when the wavelength channel spacing is less than 12.5 GHz, the small frequency wave lock is difficult to manufacture and cost. High, and there is a relatively large production error, resulting in a large error in the wavelength deviation of the optical transmitter of the determined access node. Based on the problem, the present application provides a technical solution of the following embodiments, which eliminates the wavelength reference device (such as a wave lock) in the access node, so as to solve the problem that the small frequency wave lock is difficult to manufacture and costly.

FIG. 10 is a schematic flowchart diagram of Embodiment 3 of a method for detecting wavelength deviation provided by the present application. FIG. 11 is a schematic structural diagram of an access node provided by the present application. This embodiment relates to an optional implementation manner in which a sink node acquires wavelength deviation information of an optical signal transmitted by an internal optical transmitter of an access node. As shown in Figure 10, the method can be packaged include:

S301: The sink node receives a second wavelength division multiplexed signal formed by the second optical signal sent by the at least one access node, where the second optical signal is used by the access node to transmit a pilot signal corresponding to the corresponding frequency. The optical signals emitted by the optical transmitters of the access node are modulated, and the different second optical signals carry pilot signals of different frequencies.

Specifically, in this embodiment, an access node may send one or more optical signals of optical wavelengths. Therefore, the second wavelength division multiplexed signal in this embodiment may be at least two lights that only transmit one optical wavelength. The signal obtained by combining the uplink optical signals transmitted by the access nodes of the signal may also be a signal obtained by converging the upstream optical signals transmitted by the access nodes capable of transmitting optical signals of multiple wavelengths.

Taking the second wavelength division multiplexing signal as a plurality of uplink optical signal transmissions sent by one access node as an example, the access node shown in FIG. 11 includes at least two pilot generation modules ( It is assumed that PT1', PT2', ... PTm'), at least one optical transmitter (assuming LD1', ... LDm', respectively), and a wavelength division multiplexer. Wherein each optical transmitter is connected to a corresponding modulator, and each modulator is connected to a wavelength division multiplexer. Different pilot generating modules can generate pilot signals of different frequencies, and different optical transmitters can transmit optical signals of different wavelengths. Specifically, the access node generates a pilot signal by using a pilot generation module, which is: pilot signal 1 generated by PT1' (frequency is f1'), pilot signal 2 generated by PT2 (frequency is f2'), ... The pilot signal m (frequency fm') generated by PTm'; the optical transmitters of the access node respectively transmit respective optical signals, and the optical signals emitted by each optical transmitter have different frequencies or wavelengths. As shown in FIG. 11, the sink node modulates the optical signal transmitted by LD1' using the pilot signal 1 generated by PT1' to obtain a second optical signal carrying the pilot signal 1. In the same way, the pilot generated by PTm' is used. The frequency signal m modulates the optical signal transmitted by the LDm' to obtain a second optical signal carrying the pilot signal m. The second optical signals are transmitted to a wavelength division multiplexer for corresponding processing to obtain a second wavelength division multiplexed signal and sent to the sink node. The sink node can receive the second wavelength division multiplexed signal by means of coherent reception through an internal coherent transceiver. Optionally, the transmitter in the coherent transceiver refers to an LD, a modulator, and a Digital Signal Processing (DSP) module in a sink node (CR), and the receiver in the coherent transceiver is a CR. The local oscillator source and ICR.

S302: The aggregation node performs photoelectric conversion on the second wavelength division multiplexed signal to obtain information of a pilot signal in each second optical signal in the second wavelength division multiplexed signal.

Specifically, the sink node converts the received second wavelength division multiplexed signal into a modulated electrical signal, and based on the processing of the modulated electrical signal, information of the pilot signal in each second optical signal can be obtained. Optionally, the information of the pilot signal may be a frequency of the pilot signal.

Optionally, as an optional implementation manner of S302, the sink node may perform photoelectric conversion on the second wavelength division multiplexed signal to obtain a modulated electrical signal corresponding to the second wavelength division multiplexed signal, and then the convergence node performs the modulation The electrical signal is subjected to band pass filtering to obtain an electrical signal corresponding to each of the second optical signals in the second wavelength division multiplexed signal. The electrical signal corresponding to each second optical signal carries the pilot signal in the second optical signal, and the electrical signal corresponding to each second optical signal includes two DC component signals, as shown in FIG. Show. Therefore, for the electrical signal corresponding to each second optical signal, the following operation is performed: taking the second optical signal carrying the pilot signal 1 as an example, and setting the electrical signal corresponding to the second optical signal to R, the convergence node is configured according to The frequency difference between the two DC component signals in the R signal determines the frequency of the pilot signal in the second optical signal corresponding to the R signal (ie, the second optical signal carrying the pilot signal 1); The frequency difference of the DC component signal is equal to the pilot signal of the second optical signal 2 times the frequency. Therefore, based on the relationship, the sink node can determine the frequency of carrying the pilot signal 1 described above. Similarly, the sink node can determine the frequency fm′ of the pilot signal in each second optical signal according to the frequency difference between the two DC component signals on the electrical signal corresponding to each second optical signal (ie, using two The frequency difference of the DC component signals is 2fm' divided by 2).

After the sink node obtains the frequency of the pilot signal in each of the second optical signals, the operations of S303 to S305 described below are performed for each of the second optical signals, and the processes of the following S303 to S305 are both a second optical signal. As an example to illustrate:

S303: The aggregation node determines the middle of the two DC component signals according to a frequency of a pilot signal in the second optical signal and a frequency point of two DC component signals on an electrical signal corresponding to the second optical signal. Frequency.

Specifically, after the sink node determines the frequency fm′ of the pilot signal in each second optical signal, the sink node can learn which of the two DC component signals on the electrical signal corresponds to which pilot signal (aggregation node) Before the frequency of the pilot signal is determined, the sink node only knows the frequency of the two DC component signals, and does not know which pilot signal of the frequency is included in the electrical signal where the DC component signal is located. Based on the correspondence relationship and the frequency points of the two DC component signals on the electrical signal, the intermediate frequency point of the DC component signal can be determined, and it is known which pilot signal of the frequency corresponds to the intermediate frequency point. Set the frequency of the two DC component signals on the electrical signal to F1 and F2 (where F2 is greater than F1), then the intermediate frequency of the two DC component signals is equal to F1+fm', or F2-fm', Or (F1+F2)/2. That is, in the electrical signal corresponding to the second optical signal including the pilot signal m, the intermediate frequency of the DC component signal is F1 + fm', or F2-fm', or (F1 + F2)/2. The location of this intermediate frequency point can be seen in Figure 12.

S304: The convergence node determines a difference between the intermediate frequency point and a frequency of an optical signal emitted by the local oscillator source of the convergence node.

S305: The sink node determines second wavelength deviation information of the transmitter that sends the second optical signal that includes the pilot signal in the access node according to the frequency of the pilot signal and the difference.

Specifically, since the convergence node itself can know the frequency of the optical signal emitted by the local oscillator light source (LO) in the sink node, the difference between the two can be obtained based on the intermediate frequency point and the frequency of the optical signal emitted by the local oscillator source. Δfm, the difference Δfm is the frequency offset information of the optical transmitter transmitting the second optical signal including the pilot signal m in the access node. In combination with the frequency offset information and the relationship between the wavelength and the frequency, the second wavelength deviation information of the transmitter transmitting the second optical signal including the pilot signal m in the access node can be determined.

After the sink node obtains the frequency offset information of each optical transmitter that sends the second optical signal in the access node, optionally, the sink node may directly send the frequency offset information to the access node, or may be the second The wavelength deviation information is sent to the access node. After receiving the frequency offset information or the second wavelength deviation information, the access node adjusts the wavelength of the uplink optical signal accordingly. Since the accuracy of the pilot signal in the sink node for the pilot signal detection is at the MHz level and the slow variation of the wavelength shift of the LD, the coherent reception of the sink node can be achieved without the wave lock of the access node. The wavelength deviation or the frequency offset is detected, and the access node receives the frequency offset information or the second wavelength deviation information, and adjusts the wavelength of the transmitted light at the access node according to the information to implement wavelength stabilization control.

It can be seen from the above description that the method for detecting the wavelength deviation provided by the present application, the access node loads the pilot signals of different frequencies by using different uplink optical signals sent by the optical transmitters connected to the internal signals, thereby obtaining the second light of different wavelengths. a signal, forming a second wavelength division multiplexed signal based on the second optical signal of different wavelengths, and dividing the second wavelength The multiplexed signal is sent to the sink node; the sink node photoelectrically converts the second wavelength division multiplexed signal to obtain a modulated electrical signal corresponding to the second wavelength division multiplexed signal, and performs band pass filtering on the modulated electrical signal to obtain each And determining an electric signal corresponding to the second optical signal, and then determining a frequency of the pilot signal in the second optical signal corresponding to each electrical signal based on a frequency difference between the two DC component signals on each electrical signal, thereby determining the guiding The difference between the frequency of the frequency signal and the frequency of the optical signal emitted by the local oscillator source of the sink node, and based on the difference, determines second wavelength offset information of the transmitter transmitting the second optical signal in the access node. In this embodiment, when the access node has no wave lock, the wavelength deviation or the frequency offset may be detected by the coherent reception of the sink node, and the access node receives the frequency offset information or the second wavelength deviation information, and according to the The information adjusts the wavelength of the transmitted light at the access node to achieve wavelength stability control. In addition, the sink node obtains the second wavelength deviation information corresponding to each second optical signal in parallel. Therefore, the wavelength is implemented in this embodiment. The parallel detection of the deviation improves the detection efficiency of the wavelength deviation information and realizes real-time monitoring of the wavelength deviation.

FIG. 13 is a schematic structural diagram of Embodiment 1 of a convergence node provided by the present application. As shown in FIG. 13 , the aggregation node may include: a first obtaining module 11 , a second acquiring module 12 , and a determining module 13 .

Specifically, the first obtaining module 11 is configured to acquire a wavelength division multiplexed signal, where the wavelength division multiplexed signal includes optical signals of at least two wavelengths, and optical signals of different wavelengths carry pilot signals of different frequencies;

The second obtaining module 12 is configured to acquire, according to the wavelength division multiplexing signal, information of a pilot signal in each optical signal; the information of the pilot signal includes a frequency of the pilot signal;

The determining module 13 is configured to determine wavelength deviation information of a transmitter that transmits each of the optical signals according to information of pilot signals in each optical signal.

The aggregation node provided by the present application may perform the foregoing method embodiments, and the implementation principles and technical effects thereof are similar, and details are not described herein again.

Optionally, the information about the pilot signal further includes: amplitude information of the pilot signal.

Further, the second obtaining module 12 is specifically configured to perform photoelectric conversion on the wavelength division multiplexed signal to obtain information of a pilot signal in each of the wavelength division multiplexed signals.

FIG. 14 is a schematic structural diagram of Embodiment 2 of a convergence node provided by the present application. On the basis of the device embodiment shown in FIG. 13 , the first acquiring module 11 may further include: a modulation unit 111 and a wavelength division multiplexing unit 112.

Specifically, the modulating unit 111 is configured to modulate the optical signals sent by different optical transmitters of the convergence node by using pilot signals of different frequencies to obtain at least two first optical signals; wherein different first optical signals carry different Frequency pilot signal;

The wavelength division multiplexing unit 112 is configured to perform a wavelength division multiplexing operation on the at least two first optical signals to obtain a first wavelength division multiplexing signal.

Continuing to refer to FIG. 14 , optionally, the foregoing second obtaining module 12 may include: a light splitting unit 121 , a first photoelectric conversion unit 122 , a second photoelectric conversion unit 123 , and a signal processing unit 124 .

Specifically, the light splitting unit 121 is configured to perform a power splitting operation on the first wavelength division multiplexed signal to obtain a first multiplexed signal and a second multiplexed signal; the first multiplexed signal and the second complex The signal includes at least two first optical signals, the first multiplexed signal and the first optical signal included in the second multiplexed signal being the same;

The first photoelectric conversion unit 122 is configured to perform photoelectric conversion on the first multiplexed signal to obtain the first And multiplexing a first electrical signal corresponding to the signal, and performing a first operation on each of the first multiplexed signals to obtain a first amplitude of the pilot signal in each of the first optical signals, The first operation includes determining, according to a frequency of a pilot signal in the first optical signal, an amplitude of the first electrical signal at a frequency of the pilot signal as a pilot in the first optical signal The first amplitude of the signal;

a second photoelectric conversion unit 123, configured to perform processing by transmitting the second multiplexed signal to a wavelength reference device, and performing photoelectric conversion on the optical signal output by the wavelength reference device to obtain the second multiplexed signal corresponding to a second electrical signal and performing a second operation for each of the first multiplexed signals to obtain a second amplitude of the pilot signal for each first optical signal, the second operation The determining, according to the frequency of the pilot signal in the first optical signal, determining that the amplitude of the second electrical signal at the frequency of the pilot signal is the second of the pilot signal in the first optical signal Amplitude

The signal processing unit 124 is configured to, for each first optical signal, perform an operation of: determining, according to the first amplitude and the second amplitude of the pilot signal in the first optical signal, a guide in the first optical signal The amplitude change value of the frequency signal.

Optionally, the determining module 13 is configured to perform, according to each first optical signal, an operation according to: a amplitude change value of the pilot signal in the first optical signal, and the first optical signal. The first wavelength deviation information of the optical transmitter transmitting the first optical signal in the convergence node is determined by a proportional relationship between the amplitude change value of the pilot signal and the power variation value of the first optical signal.

Optionally, the device shown in FIG. 14 may further include: the adjusting node 14;

The adjusting module 14 is further configured to adjust, according to the first wavelength deviation information, a wavelength of a transmitting light of the optical transmitter that sends the first optical signal in the aggregation node.

Optionally, the modulation unit 111 in FIG. 14 may be the PT and the LD in FIG. 5, the wavelength division multiplexing unit 112 in FIG. 14 may be the wavelength division multiplexer in FIG. 5, and the optical splitting unit 121 may be a picture. In the wavelength locking module of 5, the first photoelectric conversion unit 122 may be PD1 in FIG. 8, the second photoelectric conversion unit 123 may be PD2 in FIG. 8, and the signal processing unit 124 may be the signal processing module in FIG. Module 13 may be the pilot extraction analysis module of FIG. 5, and adjustment module 14 may be the FPGA of FIG.

The aggregation node provided by the present application may perform the foregoing method embodiments, and the implementation principles and technical effects thereof are similar, and details are not described herein again.

FIG. 15 is a schematic structural diagram of Embodiment 3 of a convergence node provided by the present application. On the basis of the device embodiment shown in FIG. 13 , the first acquiring module 11 is configured to receive a second wavelength division multiplexing signal formed by the second optical signal sent by the at least one access node. The second optical signal is obtained by the access node modulating an optical signal sent by the optical transmitter of the access node by using a pilot signal of a corresponding frequency, and the different second optical signals carry different frequencies. Pilot signal. Optionally, the first obtaining module 11 in FIG. 15 may be the ICR in FIG. 5. The second obtaining module 12 may include a third photoelectric conversion unit 125, a filtering unit 126, and a determining unit 127.

Specifically, the third photoelectric conversion unit 125 is configured to perform photoelectric conversion on the second wavelength division multiplexed signal to obtain a modulated electrical signal corresponding to the second wavelength division multiplexed signal; optionally, the third photoelectric The conversion unit 125 can also be a photodetector PD.

The filtering unit 126 is configured to perform band-pass filtering on the modulated electrical signal to obtain an electrical signal corresponding to each second optical signal, where the electrical signal corresponding to each second optical signal carries the second optical signal Pilot signal, And the electrical signal corresponding to each second optical signal includes two DC component signals; optionally, the filtering unit 126 can be a bandpass filter.

The determining unit 127 is configured to: for each electrical signal corresponding to the second optical signal, perform an operation of: determining a pilot signal in the second optical signal according to a frequency difference of two DC component signals in the electrical signal The frequency of the two DC component signals is equal to twice the frequency of the pilot signal.

Optionally, the determining module 13 is specifically configured to perform the following operations for each second optical signal:

Determining an intermediate frequency point of the two DC component signals according to a frequency of a pilot signal in the second optical signal and a frequency point of two DC component signals on an electrical signal corresponding to the second optical signal;

Determining a difference between the intermediate frequency point and a frequency of an optical signal emitted by the local oscillator source of the convergence node;

Determining, according to the frequency of the pilot signal and the difference, second wavelength deviation information of a transmitter in the access node that transmits a second optical signal including the pilot signal.

Continuing to refer to FIG. 15, optionally, the foregoing aggregation node further includes: a sending module 15;

The sending module 15 is configured to send the second wavelength deviation information to the access node, so that the access node adjusts, according to the second wavelength deviation information, the sending the The wavelength of the transmitted light of the optical transmitter of the two optical signals.

The aggregation node provided by the present application may perform the foregoing method embodiments, and the implementation principles and technical effects thereof are similar, and details are not described herein again.

FIG. 16 is a schematic structural diagram of Embodiment 4 of a convergence node provided by the present application. As shown in FIG. 16, the sink node may include a receiver 31, a memory 32, a processor 33, at least one communication bus 34, a transmitter 35, a modulator 36, a wavelength division multiplexer 37, a beam splitter 38, and a photodetector. 39 and filter 40 and wavelength reference device 41 are for example wave locks. Communication bus 34 is used to implement a communication connection between components. Memory 32 may include high speed RAM memory, and may also include non-volatile memory NVM, such as at least one disk memory, in which various programs may be stored for performing various processing functions and implementing the method steps of the present embodiments. In this embodiment, the transmitter 35 can aggregate the optical transmitters in the node, and the receiver 31 can also be an optical receiver in the sink node. The transmitter 35 and the receiver 31 can be integrated to implement the transceiver. Both the processor 35 and the receiver 31 can be coupled to the processor 33, which can effect an action of receiving or transmitting under the direction or control of the processor 33. The modulator 36, the wavelength division multiplexer 37, the optical splitter 38, and the photodetector 39 and the filter 40 can each be coupled to the processor 33 via a communication bus 34. Alternatively, the modulator 36, wavelength division multiplexing The device 37, the beam splitter 38, and the photodetector 39 and the filter 40 can also be coupled directly or indirectly to each other. The specific functions of these devices can be seen in the following embodiments.

In this embodiment, the processor 33 is configured to acquire a wavelength division multiplexed signal, where the wavelength division multiplexed signal includes an optical signal of at least two wavelengths, and acquire each light according to the wavelength division multiplexed signal. Information of the pilot signal in the signal, and determining wavelength deviation information of the transmitter transmitting each of the optical signals according to information of the pilot signal in each optical signal; wherein the optical signals of different wavelengths carry different frequencies a pilot signal; the information of the pilot signal includes a frequency of the pilot signal;

Optionally, the information about the pilot signal further includes: amplitude information of the pilot signal.

Optionally, the photodetector 39 can perform photoelectric conversion on the wavelength division multiplexed signal under the control of the processor 33 to obtain a guide in each of the wavelength division multiplexed signals. Frequency signal information.

In a possible implementation manner of the present application, the modulator 36 may be configured to modulate optical signals emitted by different optical transmitters of the convergence node by using pilot signals of different frequencies to obtain at least two first optical signals. Wherein the different first optical signals carry pilot signals of different frequencies; the wavelength division multiplexer 37 is configured to perform wavelength division multiplexing operation on the at least two first optical signals to obtain the first wavelength division multiplexing signal.

Optionally, the optical splitter 38 is configured to perform a power splitting operation on the first wavelength division multiplexed signal to obtain a first multiplexed signal and a second multiplexed signal; the first multiplexed signal and the The second multiplexed signals each include at least two first optical signals, and the first multiplexed signals and the first optical signals included in the second multiplexed signals are the same;

The photodetector 39 is configured to perform photoelectric conversion on the first multiplexed signal to obtain a first electrical signal corresponding to the first multiplexed signal, and for each of the first multiplexed signals The optical signal performs a first operation to obtain a first amplitude of the pilot signal in each of the first optical signals, the first operation comprising: determining the first according to a frequency of a pilot signal in the first optical signal An amplitude of an electrical signal at a frequency of the pilot signal is a first amplitude of a pilot signal in the first optical signal; and, for transmitting the second multiplexed signal to a wavelength reference device 41 Processing, and performing photoelectric conversion on the optical signal output by the wavelength reference device 41 to obtain a second electrical signal corresponding to the second multiplexed signal, and for each first light in the second multiplexed signal The signal performs a second operation to obtain a second amplitude of the pilot signal of each of the first optical signals, the second operation comprising: determining the second according to a frequency of a pilot signal in the first optical signal The frequency of the electrical signal at the pilot signal The amplitude of the amplitude of the second pilot signal in the first optical signal;

The processor 33 may perform, for each first optical signal, determining, according to the first amplitude and the second amplitude of the pilot signal in the first optical signal, the first optical signal. The amplitude change value of the pilot signal.

Optionally, the processor 33 may further perform, according to each first optical signal, an operation according to: a change value of the amplitude of the pilot signal in the first optical signal, and a guide in the first optical signal And determining, in a proportional relationship between the amplitude change value of the frequency signal and the power change value of the first optical signal, determining first wavelength deviation information of the optical transmitter transmitting the first optical signal in the convergence node.

Optionally, the processor 33 is further configured to adjust, according to the first wavelength deviation information, a transmit optical wavelength of the optical transmitter that sends the first optical signal in the convergence node.

In another possible implementation manner of the present application, the receiver 31 is configured to receive a second wavelength division multiplexing signal formed by a second optical signal sent by at least one access node, where the second light The signal is obtained by the access node modulating an optical signal sent by the optical transmitter of the access node by using a pilot signal of a corresponding frequency, and the different second optical signals carry pilot signals of different frequencies.

The photodetector 39 can also be configured to perform photoelectric conversion on the second wavelength division multiplexed signal to obtain a modulated electrical signal corresponding to the second wavelength division multiplexed signal;

The filter 40 is configured to perform band-pass filtering on the modulated electrical signal to obtain an electrical signal corresponding to each second optical signal, where the electrical signal corresponding to each second optical signal carries the second optical signal a pilot signal in the middle, and an electrical signal corresponding to each second optical signal includes two DC component signals;

The processor 33 may further perform an operation of determining, according to a frequency difference of two DC component signals of the electrical signal, a pilot in the second optical signal, for each electrical signal corresponding to the second optical signal. The frequency of the signal; wherein the frequency difference of the two DC component signals is equal to twice the frequency of the pilot signal.

Further, the processor 33 may further perform the following operations for each second optical signal:

Determining an intermediate frequency point of the two DC component signals according to a frequency of a pilot signal in the second optical signal and a frequency point of two DC component signals on an electrical signal corresponding to the second optical signal;

Determining a difference between the intermediate frequency point and a frequency of an optical signal emitted by the local oscillator source of the convergence node;

Determining, according to the frequency of the pilot signal and the difference, second wavelength deviation information of a transmitter in the access node that transmits a second optical signal including the pilot signal.

Optionally, the transmitter 35 is configured to send the second wavelength deviation information to the access node, so that the access node adjusts the sending in the access node according to the second wavelength deviation information. The wavelength of the transmitted light of the optical transmitter of the second optical signal.

The aggregation node provided by the present application may perform the foregoing method embodiments, and the implementation principles and technical effects thereof are similar, and details are not described herein again.

The present application also provides a computer readable storage medium having stored therein instructions that, when executed on a computer, cause the computer to execute a method performed by a processor of a sink node in the above method embodiments .

Embodiments of the present application also provide a computer program product comprising instructions that, when executed by a computer, cause the computer to perform the functions performed by a processor of a sink node in the above method.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using a software program, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present application are generated in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium. For example, the computer instructions can be from a website site, computer, server, or data center to another website site via a wired (eg, coaxial cable, fiber optic digital subscriber line DSL) or wireless (eg, infrared, wireless, microwave, etc.) Transfer from a computer, server, or data center. The computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media. The usable medium may be a magnetic medium such as a floppy disk, a hard disk, a magnetic tape, an optical medium (such as a DVD), or a semiconductor medium (such as a solid state hard disk SSD) or the like.

Claims (22)

A method for detecting a wavelength deviation, comprising: Obtaining a wavelength division multiplexed signal, where the wavelength division multiplexed signal includes optical signals of at least two wavelengths, and optical signals of different wavelengths carry pilot signals of different frequencies; Acquiring information of a pilot signal in each optical signal according to the wavelength division multiplexed signal; the information of the pilot signal includes a frequency of the pilot signal; Wavelength deviation information of a transmitter transmitting each of the optical signals is determined based on information of pilot signals in each optical signal. The method according to claim 1, wherein the information of the pilot signal further comprises: amplitude information of the pilot signal. The method according to claim 1 or 2, wherein the acquiring the information of the pilot signal in each optical signal according to the wavelength division multiplexed signal comprises: The wavelength division multiplexed signal is photoelectrically converted to obtain information of a pilot signal in each of the wavelength division multiplexed signals. The method according to claim 3, wherein the acquiring the wavelength division multiplexed signal comprises: The pilot signals of different frequencies are used to modulate the optical signals emitted by different optical transmitters of the convergence node to obtain at least two first optical signals; wherein different first optical signals carry pilot signals of different frequencies; Performing a wavelength division multiplexing operation on the at least two first optical signals to obtain a first wavelength division multiplexed signal. The method according to claim 4, wherein the optically converting the wavelength division multiplexed signal to obtain the information of the pilot signal in each of the wavelength division multiplexed signals comprises: Performing a power splitting operation on the first wavelength division multiplexed signal to obtain a first multiplexed signal and a second multiplexed signal; each of the first multiplexed signal and the second multiplexed signal includes at least two first An optical signal, the first multiplexed signal and the first optical signal included in the second multiplexed signal being the same; Performing photoelectric conversion on the first multiplexed signal to obtain a first electrical signal corresponding to the first multiplexed signal, and performing a first operation on each of the first multiplexed signals to Obtaining a first amplitude of the pilot signal in each of the first optical signals, the first operation comprising: determining, according to a frequency of the pilot signal in the first optical signal, the first electrical signal at the pilot The amplitude at the frequency of the signal is the first amplitude of the pilot signal in the first optical signal; And performing the photoelectric conversion by transmitting the second multiplexed signal to the wavelength reference device, and performing photoelectric conversion on the optical signal output by the wavelength reference device, to obtain a second electrical signal corresponding to the second multiplexed signal, and Performing a second operation on each of the first multiplexed signals to obtain a second amplitude of the pilot signal of each of the first optical signals, the second operation comprising: according to the first optical signal a frequency of the pilot signal, determining that the amplitude of the second electrical signal at the frequency of the pilot signal is a second amplitude of the pilot signal in the first optical signal; For each of the first optical signals, an operation of determining an amplitude change value of the pilot signal in the first optical signal based on the first amplitude and the second amplitude of the pilot signal in the first optical signal. The method according to claim 5, wherein the determining the wavelength deviation information of the optical transmitter that transmits each of the optical signals according to the information of the pilot signals in each optical signal comprises: For each first optical signal, performing an operation of: determining a magnitude of a pilot signal in the first optical signal a value of the change, and a proportional relationship between the amplitude change value of the pilot signal in the first optical signal and the power change value of the first optical signal, determining the light in the sink node transmitting the first optical signal The first wavelength deviation information of the transmitter. The method of claim 6 wherein the method further comprises: And adjusting, according to the first wavelength deviation information, a wavelength of a transmission light of an optical transmitter that transmits the first optical signal in the aggregation node. The method according to claim 3, wherein the acquiring the wavelength division multiplexed signal comprises: Receiving a second wavelength division multiplexed signal formed by the second optical signal sent by the at least one access node; wherein the second optical signal is used by the access node to transmit the pilot signal of the corresponding frequency to the access node The optical signals emitted by the optical transmitter are modulated, and the different second optical signals carry pilot signals of different frequencies. The method according to claim 8, wherein the optically converting the wavelength division multiplexed signal to obtain the information of the pilot signal in each of the wavelength division multiplexed signals comprises: Performing photoelectric conversion on the second wavelength division multiplexed signal to obtain a modulated electrical signal corresponding to the second wavelength division multiplexed signal; Band-pass filtering the modulated electrical signal to obtain an electrical signal corresponding to each second optical signal, wherein the electrical signal corresponding to each second optical signal carries a pilot signal in the second optical signal, and Each of the electrical signals corresponding to the second optical signal includes two DC component signals; Determining, for each electrical signal corresponding to the second optical signal, determining a frequency of the pilot signal in the second optical signal according to a frequency difference of two DC component signals in the electrical signal; The frequency difference between the two DC component signals is equal to twice the frequency of the pilot signal. The method according to claim 9, wherein the determining the wavelength deviation information of the optical transmitter that transmits each of the optical signals according to the information of the pilot signals in each optical signal comprises: For each second optical signal, do the following: Determining an intermediate frequency point of the two DC component signals according to a frequency of a pilot signal in the second optical signal and a frequency point of two DC component signals on an electrical signal corresponding to the second optical signal; Determining a difference between the intermediate frequency point and a frequency of an optical signal emitted by the local oscillator source of the convergence node; Determining, according to the frequency of the pilot signal and the difference, second wavelength deviation information of a transmitter in the access node that transmits a second optical signal including the pilot signal. The method of claim 10, wherein the method further comprises: Transmitting the second wavelength deviation information to the access node, so that the access node adjusts, according to the second wavelength deviation information, an optical transmitter that sends the second optical signal in the access node. Send light wavelength. A convergence node, comprising: a first acquiring module, configured to acquire a wavelength division multiplexed signal, where the wavelength division multiplexed signal includes optical signals of at least two wavelengths, and optical signals of different wavelengths carry pilot signals of different frequencies; a second acquiring module, configured to acquire, according to the wavelength division multiplexing signal, information of a pilot signal in each optical signal; the information of the pilot signal includes a frequency of the pilot signal; And a determining module, configured to determine wavelength deviation information of a transmitter that transmits each of the optical signals according to information of pilot signals in each optical signal. The sink node according to claim 12, wherein the information of the pilot signal further comprises: amplitude information of the pilot signal. The aggregation node according to claim 12 or 13, wherein the second obtaining module is specifically configured to perform photoelectric conversion on the wavelength division multiplexed signal to obtain each of the wavelength division multiplexed signals Information of the pilot signal in the optical signal. The aggregation node according to claim 14, wherein the first obtaining module comprises: a modulating unit, configured to modulate optical signals emitted by different optical transmitters of the convergence node by using pilot signals of different frequencies to obtain at least two first optical signals; wherein different first optical signals carry pilots of different frequencies signal; And a wavelength division multiplexing unit, configured to perform a wavelength division multiplexing operation on the at least two first optical signals to obtain a first wavelength division multiplexing signal. The aggregation node according to claim 15, wherein the second obtaining module comprises: a light splitting unit, configured to perform a power splitting operation on the first wavelength division multiplexed signal to obtain a first multiplexed signal and a second multiplexed signal; the first multiplexed signal and the second multiplexed signal both include At least two first optical signals, the first multiplexed signal and the first optical signal included in the second multiplexed signal being the same; a first photoelectric conversion unit configured to perform photoelectric conversion on the first multiplexed signal to obtain a first electrical signal corresponding to the first multiplexed signal, and for each of the first multiplexed signals The optical signal performs a first operation to obtain a first amplitude of the pilot signal in each of the first optical signals, the first operation comprising: determining the first according to a frequency of a pilot signal in the first optical signal An amplitude of an electrical signal at a frequency of the pilot signal is a first amplitude of a pilot signal in the first optical signal; a second photoelectric conversion unit, configured to perform processing by transmitting the second multiplexed signal to a wavelength reference device, and performing photoelectric conversion on the optical signal output by the wavelength reference device to obtain a corresponding corresponding to the second multiplexed signal a second electrical signal, and performing a second operation for each of the first multiplexed signals to obtain a second amplitude of the pilot signal for each of the first optical signals, the second operation comprising Determining, according to a frequency of the pilot signal in the first optical signal, an amplitude of the second electrical signal at a frequency of the pilot signal as a second amplitude of a pilot signal in the first optical signal ; a signal processing unit, configured to: for each first optical signal, determine a pilot in the first optical signal according to a first amplitude and a second amplitude of a pilot signal in the first optical signal The amplitude change value of the signal. The aggregation node according to claim 16, wherein the determining module is configured to perform, for each first optical signal, an operation according to: a change value of a amplitude of the pilot signal in the first optical signal And determining, in a proportional relationship between the amplitude change value of the pilot signal in the first optical signal and the power change value of the first optical signal, determining an optical transmitter in the sink node that transmits the first optical signal First wavelength deviation information. The aggregation node according to claim 17, wherein the aggregation node further comprises: an adjustment module; The adjusting module is further configured to adjust, according to the first wavelength deviation information, a wavelength of a transmitting light of an optical transmitter that sends the first optical signal in the aggregation node. The convening node according to claim 14, wherein the first acquiring module is configured to receive a second wavelength division multiplexed signal formed by the second optical signal sent by the at least one access node; Description The second optical signal is obtained by the access node modulating the optical signal sent by the optical transmitter of the access node by using a pilot signal of a corresponding frequency, and the different second optical signals carry pilot signals of different frequencies. The aggregation node according to claim 19, wherein the second obtaining module comprises: a third photoelectric conversion unit, configured to perform photoelectric conversion on the second wavelength division multiplexed signal to obtain a modulated electrical signal corresponding to the second wavelength division multiplexed signal; a filtering unit, configured to perform band-pass filtering on the modulated electrical signal to obtain an electrical signal corresponding to each second optical signal, where the electrical signal corresponding to each second optical signal carries the second optical signal a pilot signal, and the electrical signal corresponding to each second optical signal includes two DC component signals; a determining unit, configured to: for each electrical signal corresponding to the second optical signal, perform an operation of: determining a pilot signal in the second optical signal according to a frequency difference of two DC component signals in the electrical signal a frequency; wherein a frequency difference of the two DC component signals is equal to twice a frequency of the pilot signal. The aggregation node according to claim 20, wherein the determining module is specifically configured to perform the following operations for each second optical signal: Determining an intermediate frequency point of the two DC component signals according to a frequency of a pilot signal in the second optical signal and a frequency point of two DC component signals on an electrical signal corresponding to the second optical signal; Determining a difference between the intermediate frequency point and a frequency of an optical signal emitted by the local oscillator source of the convergence node; Determining, according to the frequency of the pilot signal and the difference, second wavelength deviation information of a transmitter of the access node that transmits a second optical signal including the pilot signal. The aggregation node according to claim 21, wherein the aggregation node further comprises: a sending module; The sending module is configured to send the second wavelength deviation information to the access node, so that the access node adjusts, according to the second wavelength deviation information, the second node to send the second The wavelength of the transmitted light of the optical transmitter of the optical signal.

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