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WO2017179241A1 - Appareil de relais de signaux optiques et procédé de relais - Google Patents

Appareil de relais de signaux optiques et procédé de relais Download PDF

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Publication number
WO2017179241A1
WO2017179241A1 PCT/JP2016/087392 JP2016087392W WO2017179241A1 WO 2017179241 A1 WO2017179241 A1 WO 2017179241A1 JP 2016087392 W JP2016087392 W JP 2016087392W WO 2017179241 A1 WO2017179241 A1 WO 2017179241A1
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Prior art keywords
signal
optical
burst
output
burst reception
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PCT/JP2016/087392
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English (en)
Japanese (ja)
Inventor
大助 梅田
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Sumitomo Electric Industries Ltd
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Sumitomo Electric Industries Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/27—Arrangements for networking
    • H04B10/272—Star-type networks or tree-type networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/29—Repeaters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/44—Star or tree networks

Definitions

  • an optical signal between a station-side device and a home-side device is converted into an optical signal again by an electric / optical module after being optical / electrically converted by the optical / electric module.
  • the present invention relates to an optical repeater that performs relaying.
  • a peak hold circuit is installed in a post-amplifier (post-amplifier, comparator) installed in the subsequent stage of the photodetecting element of the optical / electric module (see Patent Document 2), and the burst received signal is received by the peak hold circuit.
  • post-amplifier post-amplifier, comparator
  • the head of the burst signal can be detected at high speed (at a time earlier than when the receiver in the optical signal repeater reproduces the burst signal and synchronization is established).
  • the preamble can be complemented.
  • a reset circuit that resets the peak hold circuit based on the detection of the end of the burst signal is necessary in order to enter the reception state of the next burst signal.
  • An optical signal relay device includes an optical / electrical conversion module that converts a received optical burst signal into a burst reception signal, and a signal detection (Signal_Detection) signal (Signal_Detection) signal (Signal_Detection) signal ( Hereinafter, the signal detection unit that outputs an SD signal) and detects the end of one burst reception signal, the signal detection starts detection of the next burst reception signal after a predetermined reset time has elapsed.
  • a delay buffer unit that accumulates and delays the burst reception signal output from the optical / electric module, and outputs the delayed burst reception signal, and the synchronization pattern of the optical burst signal is a synchronization pattern signal.
  • a switching unit that performs switching with the synchronization pattern signal, a timing control unit that controls switching of the switching unit, an electrical / optical converter that converts the output signal switched by the switching unit into an optical burst signal, and The output of the signal detector is monitored, and after the end of one SD signal, if it is determined that the next SD signal has been detected when the reset time has elapsed, a continuous burst reception determination signal is output over a predetermined time And a timing control unit that switches a synchronization pattern of the delayed burst reception signal output from the buffer unit to the synchronization pattern signal over a period in which the continuous burst reception determination signal exists.
  • the switching unit is controlled.
  • the relay method of the present disclosure relates to an optical signal relay method executed in the optical signal relay device.
  • Optical subscriber line station side device Optical Line Terminal; hereinafter referred to as “station side device” or “OLT”
  • Optical Network Unit Optical Network Unit
  • OLT Optical Line Terminal
  • ONU optical subscriber line termination devices
  • optical communication system in which two-way communication is performed via a fiber optic communication network.
  • a single star optical fiber communication network in which the OLT and each ONU are radially connected by optical fibers is constructed and put into practical use.
  • the configuration of the system and communication equipment is simplified, but one ONU occupies one optical fiber, and this optical fiber must be directly connected to the OLT by wiring. Therefore, if there are N ONU stations, N optical fibers directly connected by wiring from the OLT are required, and it is difficult to reduce the price of the optical communication system.
  • a PON (Passive Optical Network) system has been put to practical use as an optical communication system in which one optical fiber connected by wiring from the OLT is shared by a plurality of ONUs.
  • a passive optical branching device hereinafter also simply referred to as “optical coupler” that passively branches and multiplexes an input signal without requiring an external power supply and an OLT are optically connected. Connected via fiber.
  • optical fibers branched by optical couplers are provided according to the number of ONUs.
  • the OLT and the ONU of the N station are based on 1 to N transmission connected via an optical fiber and an optical coupler. Thereby, many ONUs can be allocated to one OLT, and the overall equipment cost can be suppressed.
  • a group of signals (referred to as optical burst signals) including a large number of 0s and 1s are transmitted from one ONU to the OLT.
  • Optical burst signals are also transmitted from other ONUs.
  • the OLT allocates a time slot for transmitting an optical burst signal to each ONU so that these optical burst signals do not compete in time. That is, each optical burst signal is multiplexed in a time division manner and transmitted to the OLT.
  • the optical signal may be converted into a burst reception signal by the optical / electric module, and optically converted again by the electric / optical module and relayed. Has been done.
  • This repeater is called an “optical signal repeater”.
  • the optical burst signal is provided with a synchronization bit portion as a preamble (payload). This synchronization bit portion is originally provided for use by the OLT optical burst signal receiving circuit.
  • the optical signal repeater it is necessary to accurately reproduce and repeat the synchronization bit portion so as not to hinder the operation of the OLT optical burst signal receiving circuit.
  • the reproduction of preamble bit information may be inaccurate in the optical signal repeater. If the reproduction of the bit information of the preamble is inaccurate in the optical signal repeater, there is a possibility that the reception of the OLT optical burst signal may be hindered.
  • a peak hold circuit is installed in a post-amplifier (post-amplifier, comparator) installed in the subsequent stage of the photodetecting element of the optical / electric module (see Patent Document 2), and the burst received signal is received by the peak hold circuit.
  • post-amplifier post-amplifier, comparator
  • the head of the burst signal can be detected at high speed (at a time earlier than when the receiver in the optical signal repeater reproduces the burst signal and synchronization is established).
  • the preamble can be complemented.
  • a reset circuit that resets the peak hold circuit based on the detection of the end of the burst signal is necessary in order to enter the reception state of the next burst signal.
  • the reset circuit monitors the pattern of the burst signal, detects the end of the burst signal, and generates a reset signal. Specifically, the end of the burst signal is detected based on the continuation of the 0 signal (in the case of GE-PON) or the burst end delimiter (in the case of 10G-EPON), and the reset signal is generated. The time until the reset circuit detects the end of the burst signal, generates the reset signal, and cancels it, that is, the time for discharging the charge accumulated in the peak hold capacitor (reset time) is set.
  • the reset time needs to be set in consideration of not only the peak hold circuit but also the response to the burst signal of the preamplifier (preamplifier) and the AC coupling circuit in the preceding stage of the peak hold circuit. If only the peak hold circuit is considered, there are the following disadvantages. That is, even if the peak hold circuit is reset based on the end of the burst signal, charge remains in the preamplifier (preamplifier) and AC coupling circuit in the previous stage, so the remaining charge is erroneously detected as the next burst signal. There is a risk that. Therefore, it is necessary to set the reset time longer than the time for discharging the charge of the preamplifier (preamplifier) or the AC coupling circuit.
  • the reset time should be shorter as long as it satisfies the condition that the charge of the preamplifier and the AC coupling circuit is longer than the time of discharge (that is, the time for the charge of the preamplifier and AC coupling circuit to discharge).
  • the IEEE802.3av 10G-EPON has adopted 64B / 66B code as the encoding method for PON systems, which is the conventional IEEE802.3ah GE- Unlike the PON 8B / 10B code, the balance between the code 0 and code 1 (mark rate) is allowed to some extent. For this reason, it is better to set the response of the preamplifier (preamplifier) or the AC coupling circuit slower.
  • Patent Document 3 has a description regarding deviation of 0 signal and 1 signal (baseline wander) when receiving a signal encoded by a 64B / 66B code used in 10G-EPON. For this reason, 10G-EPON requires a longer reset time than GE-PON. In this case, a problem arises when adjacent burst signals come in at short intervals. Since the next burst signal comes in without the previous burst signal being reset and the signal cannot be detected during the reset time, the bits near the beginning of the next burst signal are largely lost. In this case, even if the technique for complementing the preamble described in Patent Document 1 is applied, it may be possible to complement the optical burst signal from the middle of the preamble, but it is difficult to complement from the vicinity of the beginning of the preamble.
  • An object of the present invention is to provide an optical signal relay device and a relay method that can be complemented.
  • the optical signal repeater of the present embodiment includes an optical / electrical conversion module that converts a received optical burst signal into a burst received signal, and an SD signal during a period in which the converted burst received signal is detected.
  • An output signal detection unit that detects the end of one burst reception signal and starts detection of the next burst reception signal after a predetermined reset time has elapsed, and the optical / electric module
  • a delay buffer unit that accumulates and delays the burst reception signal output from the output unit and outputs the delayed burst reception signal; and a holding unit that holds a synchronization pattern of the optical burst signal as a synchronization pattern signal; Switching between the delayed burst reception signal output from the delay buffer unit and the synchronization pattern signal held by the synchronization pattern holding unit.
  • a switching unit that performs switching, a timing control unit that controls switching of the switching unit, and an electrical / optical converter that converts an output signal switched by the switching unit into an optical burst signal, and the signal detection unit And a determination unit that outputs a continuous burst reception determination signal for a predetermined time when it is determined that the next SD signal has been detected when the reset time has elapsed after the end of one SD signal,
  • the timing control unit controls the switching unit to switch a synchronization pattern of a delayed burst reception signal output from the buffer unit to the synchronization pattern signal over a period in which the continuous burst reception determination signal exists.
  • the following operation is obtained. If the received optical burst signal is converted into a burst reception signal and the end of one burst reception signal is detected, detection of the next burst reception signal is started after a predetermined reset time has elapsed. During the detection period, an SD signal is output, the converted burst reception signal is accumulated and delayed, the synchronization pattern of the optical burst signal is held as a synchronization pattern signal, and the delayed burst reception is performed. Switching between the signal and the held synchronization pattern signal is performed.
  • the output of the signal detection unit is monitored, and after the completion of one SD signal, it is determined that the next SD signal is detected when the reset time has elapsed.
  • a continuous burst reception determination signal is output over a predetermined time, and a synchronization pattern of a delayed burst reception signal output from the buffer unit is output over the period in which the continuous burst reception determination signal exists. You can switch to a signal.
  • the synchronization pattern signal can be supplemented from the beginning of the next burst signal.
  • the predetermined time for the determination unit to output the continuous burst reception determination signal is the time for ensuring the minimum burst interval after the reset time has elapsed. Preferably later. The minimum burst interval can be ensured, and the processing of the station side device (OLT) of the PON system is facilitated.
  • OLT station side device
  • the delay buffer unit further accumulates and delays the SD signal output from the signal detection unit, outputs the delayed SD signal, and the switching unit. Switches the delayed burst reception signal output from the buffer unit to the synchronization pattern signal over both the period in which the delayed SD signal exists and the period in which the continuous burst reception determination signal exists. It is preferable that In this case, the part before the SD signal is detected can be complemented.
  • the determination unit monitors the output of the signal detection unit, and after the end of one SD signal, the next SD signal is not detected when the reset time has elapsed. In this case, the continuous burst reception determination signal may not be output. In this case, it is possible to supplement the portion of the next received burst signal after the SD signal is detected.
  • the burst signal may collide on the station side device (OLT) side rather than the relay device.
  • the delay buffer unit delays the burst reception signal at least the reset time.
  • the next SD signal can supplement the part that has entered before the lapse of the reset time by the delay time.
  • the upper limit of the delay time is preferably a preamble time. This is because if it is longer than the preamble time, it is not necessary to perform processing based on the timing of the SD signal, and the head of the data section can be found and processing can be performed according to the timing.
  • the predetermined time for the determination unit to output the continuous burst reception determination signal is set in a range from the detection of the next SD signal to the reset time. It is preferable. As a result, the portion before the SD signal can be complemented by the time for outputting the continuous burst reception determination signal. If this time is set longer than the reset time, it may collide with the previous burst signal.
  • the relay method of the present embodiment relates to a relay method executed by the optical signal relay devices (1) to (6) described above. Therefore, the relay method of the present embodiment has the same effects as the relay devices (1) to (6) described above.
  • FIG. 1 is a schematic diagram illustrating a configuration example of an optical communication system 1 in which a station-side device and a plurality of home-side devices are connected by an optical fiber.
  • the optical communication system 1 includes an OLT (station side device) 2 provided in a control station side station, and ONUs (home side devices) 3a, 3b,. . . (Hereinafter collectively referred to as “ONU3”), a trunk optical fiber 4a connected to the OLT 2, and a branch optical fiber 4b connected to each ONU 3 (hereinafter collectively referred to as “optical fiber 4”); An optical coupler 5 for connecting the trunk optical fiber 4a and a plurality of branch optical fibers 4b, and an optical signal repeater 7 inserted in the middle of the trunk optical fiber 4a are provided.
  • the ONU 3 is a device for each subscriber to enjoy the optical network service, and is installed in the subscriber's home.
  • the ONU 3 is connected to a terminal device such as a personal computer (hereinafter simply referred to as a PC) 9.
  • the optical coupler 5 does not require any external power supply and passively branches and multiplexes the signal input from the optical fiber 4 connected to one side and outputs it to the optical fiber 4 connected to the other side. It can be made of a star coupler. Thereby, many ONU3 can be allocated with respect to one OLT2, and the whole installation cost can be suppressed.
  • the optical communication system 1 including the OLT 2 and the ONU 3 includes, for example, a GE-PON (Gigabit Ethernet) technology that realizes access section communication at a communication speed of 1.25 Gbps using an optical fiber.
  • a GE-PON Gigabit Ethernet
  • IEEE802.3ah Gigabit Ethernet-Passive Optical Network
  • 10G-EPON (IEEE802.3av) system may be adopted.
  • the OLT 2 and the ONU 3 communicate with each other in units of variable length frames.
  • This frame has a synchronization bit portion including sampling data and a data portion of 64 bytes or more.
  • the transmission / reception procedure of the signals in the downlink direction and the uplink direction of the signals of the ONU 3 and the OLT 2 will be described.
  • the flow of a downstream signal transmitted from the upper network such as the Internet network toward the ONU 3 will be described.
  • a predetermined bridge process is performed in order to identify the logical link to be relayed.
  • the OLT 2 adds information such as a synchronization bit part including a logical link identifier and a PON header to the frame signal, converts it into an optical signal, and sends it to the trunk optical fiber 4a.
  • This downstream optical signal is composed of a combination of a transmission signal that specifies a specific ONU 3 and an idle signal that does not specify the ONU 3, and is a continuous signal that does not stop.
  • the optical signal sent to the trunk optical fiber 4a passes through the optical signal repeater 7, branches at the optical coupler 5, and is sent to each ONU 3 via each branch optical fiber 4b. At this time, only the ONU 3 provided with the logical link can take in a predetermined optical signal. Then, the ONU 3 that has fetched the frame signal relays the home network interface and sends data to a terminal device such as the PC 9.
  • the transmission rate of the bits constituting the optical burst signal is, for example, 1.25 Gbps for GE-PON and 10.3125 Gbps for 10G-EPON.
  • optical burst signals are transmitted through the branch optical fibers 4, and the optical burst signals are multiplexed and transmitted through the optical coupler 5 on the trunk optical fiber 4a. At this time, these optical burst signals are controlled to be transmitted so as not to compete with each other in time.
  • a window hereinafter also simply referred to as a window
  • an upstream optical signal may be transmitted is assigned to each ONU 3, and is notified as a control frame. Is done. Therefore, in the same optical communication system 1, the upstream optical signal transmitted from each ONU 3 can avoid contention. In this way, mutual optical communication between the ONU 3 and the OLT 2 is performed.
  • FIG. 2 is a schematic diagram showing optical burst transmission of an upstream optical frame signal sent from each ONU 3 to the OLT 2 via the optical fiber 4 using a time division method.
  • the upstream optical frame signal is transmitted under the control of the window so that the optical burst signal 6a from the ONU 3a, the optical burst signal 6b from the ONU 3b, the optical burst signal 6c from the ONU 3c, etc. do not compete with each other in time. .
  • the signal included in the optical burst signal from each ONU 3 includes a synchronization bit portion that constitutes the preamble PA, and a signal such as a data portion DATA that includes a plurality of frames and cells.
  • the synchronization bit part is used for bit synchronization establishment of an optical burst bit synchronization circuit provided in the OLT 2.
  • the pattern of the synchronization bit portion is an 8B10B idle signal in GE-PON.
  • the mark ratio (ratio of 0, 1) is usually 50%, and the number of bits is fixed. In 10G-EPON, a fixed 66-bit sync pattern is repeated.
  • the mark rate is usually 50% in the synchronous bit part, and the number of bits is fixed.
  • FIG. 3 is a block diagram showing the configuration of the optical signal repeater 7 of the present invention, and FIGS. 4 and 5 show details of the optical / electrical module 71 therein.
  • FIG. 6 is a signal waveform diagram of the signal (j) from the signal (a) of each part in the optical signal relay device 7.
  • the optical signal relay device 7 is a device that converts an optical burst signal into a burst received signal (referred to as a burst received signal; see signal (a) in FIG. 6), and relays it back to an optical signal.
  • the optical signal repeater 7 is a bidirectional optical signal repeater 7, one of which relays an upstream optical burst signal from the ONU 3 to the OLT 2, and the other is a downstream of the OLT 2 to the ONU 3. Repeat optical continuous signal.
  • the optical signal repeater 7 that relays the upstream optical burst signal detects the optical / electric module 71 that converts the optical burst signal into a burst reception signal, and the start / end of reception of the optical burst signal.
  • a timing control unit 77 capable of performing the above.
  • the optical / electrical module 71 includes an optical / electrical conversion element 711, a preamplifier 712 that amplifies a light detection signal (referred to as a burst reception signal) by the optical / electrical conversion element 711, and an output of the preamplifier 712.
  • a post-amplifier 713 that is AC-coupled via a capacitor and further amplifies the output signal of the preamplifier 712 is provided.
  • the postamplifier 713 includes an amplifying unit 81 that amplifies the output signal of the preamplifier 712, and a binarizing unit 82 that binarizes the burst reception signal using a predetermined threshold.
  • the post-amplifier 713 further includes a peak hold circuit 83 (intensity detection circuit) for detecting whether or not a burst reception signal is present, and a signal detection unit 84.
  • the signal detection unit 84 compares the output of the peak hold circuit 83 with a detection threshold value, and outputs an SD signal (see signal (b) in FIG. 6) for a time during which the output of the peak hold circuit 83 exceeds the detection threshold value. .
  • the peak hold circuit 83 receives the SD reset signal (see the signal (c) in FIG. 6) from the timing control unit 77.
  • the SD reset signal is determined by the timing control unit 77 to monitor the burst reception signal, for example, when the burst reception signal is completed when it is detected that “0” of the binary values of the burst reception signal continues for a predetermined time. This is a signal (SD reset signal) that is determined and sent to the peak hold circuit 83.
  • the time of this SD reset signal is called reset time Trst.
  • the reset time Trst is a time set by the optical signal repeater 7. If the reset time Trst is too short, the preamplifier 712 or the AC coupling circuit in the previous stage is used even if the peak hold circuit 83 is reset by the SD reset signal. Since charges remain in (AC coupling), the remaining charges may be erroneously detected as the next burst signal.
  • the reset time Trst is preferably set shorter than the minimum burst signal length used in the PON system. If the burst signal is set to be equal to or greater than the minimum burst signal, the next burst signal transmitted by an ONU that does not pass through the optical signal repeater 7 (for example, ONU 3d shown in FIG. 1) may overlap within the reset time when a continuous burst reception determination is output. Because there is. By setting it shorter than the burst signal length, it is ensured that no collision occurs with such a next burst signal.
  • the optical / electrical module 71 supplies a signal detection signal (SD signal) indicating the presence of the optical burst signal to the timing control unit 77.
  • SD signal signal detection signal
  • the timing control unit 77 can know the reception start of the optical burst signal based on the SD signal. Further, the timing control unit 77 can monitor the output of the optical / electrical module 71 to know the end of reception. When the end of reception is detected, an SD reset signal is supplied to the optical / electrical module 71 as described above.
  • the continuous burst reception determination unit 72 receives the SD signal and the SD reset signal, determines that the next SD signal has been detected when one SD signal ends and the reset time Trst has elapsed. In this case, the continuous burst reception determination signal is output to the timing control unit 77 over a predetermined time. If one SD signal ends and the next SD signal is not detected after the reset time Trst has elapsed, the continuous burst reception determination signal is not output.
  • the adjacent upstream optical burst signal enters the optical signal repeater 7 in a substantially continuous state.
  • the continuous burst reception determination unit 72 determines such a continuous reception state of the upstream optical burst signal.
  • the duration of the continuous burst reception determination signal is from time T1 to T2 when the elapsed time of the reset time Trst is 0 (see signal (d) in FIG. 6).
  • T2-T1 is set to a value satisfying 0 ⁇ (T2-T1) ⁇ Trst.
  • T2 is set to a value equal to or greater than Trst and equal to or less than the time that the synchronization bit portion in one optical burst signal continues.
  • the meaning of providing T1 which is not 0 is to secure a minimum burst interval between adjacent burst signals output from the optical signal repeater 7.
  • the burst reception signal converted by the optical / electrical module 71 is input to a clock recovery unit (not shown).
  • the clock recovery unit extracts a clock signal synchronized with each bit of the optical burst signal based on the optical burst signal. This signal is referred to as “regenerated clock”. Then, each bit of the burst reception signal is sampled by the reproduction clock and written to the delay buffer unit 73.
  • the delay buffer unit 73 is composed of a FIFO memory having a depth corresponding to the delay time, and reads out with the reference clock of the optical signal relay device 7.
  • a reference clock a recovered clock extracted when relaying a downstream signal from the station side terminal device OLT2 to the slave station ONU3 can be used.
  • a reference clock may be input from the outside and time management may be performed based on the reference clock.
  • the signal (e) in FIG. 6 shows the burst reception signal before being written in the delay buffer unit 73
  • the signal (f) in FIG. 6 shows the burst reception signal after being written in the delay buffer unit 73.
  • the upper limit of the setting of the delay time Tdelay is the time that the synchronization bit part continues in one optical burst signal.
  • the switching unit 75 switches between the synchronization pattern signal output from the synchronization pattern holding unit 74 and the burst reception signal output from the delay buffer unit 73 based on the switching signal from the timing control unit 77.
  • the timing control unit 77 sends a switching signal to the switching unit 75 and is delayed while the continuous burst reception determination signal continues (see the signal (d) in FIG. 6). The burst reception signal is switched to the synchronization pattern signal.
  • the delayed burst reception signal is replaced with the synchronization pattern signal. This replacement makes it possible to supplement the first portion of the burst reception signal that could not be received during the reset signal period with a minimum burst interval for the “next burst reception signal”. .
  • not only the burst reception signal but also the SD signal is sent to the delay buffer unit 73, and the delayed burst reception signal and the SD signal are extracted from the delay buffer unit 73.
  • the delay time of the burst reception signal and the SD signal may be the same time.
  • the waveform of the delayed SD signal is shown in signal (g) of FIG.
  • the timing control unit 77 is in a period in which the continuous burst reception determination signal continues (see signal (d) in FIG. 6) and in a period in which the delayed SD signal continues (signal (g) in FIG. 6). (Refer to the signal (h) in FIG. 6), and based on the logical sum, a switching signal is sent to the switching unit 75, and the delayed burst reception signal is switched to the synchronization pattern signal.
  • the delay buffer unit 73 and the synchronization pattern holding unit 74 are synchronized with the reproduction clock or the reference clock, and switching control is also performed by synchronizing with the reproduction clock or the reference clock. No frequency fluctuations or phase fluctuations due to. Although there is a possibility that the synchronization pattern is broken at the time of switching, since it is limited to before and after one bit that has been switched, no frequency fluctuation / phase fluctuation occurs, and the mark rate does not fluctuate greatly. (OLT) reception is not affected.
  • the electrical / optical module 76 converts the restoration signal in which the head of the synchronization bit portion is replaced with the correct synchronization pattern in this way into an optical burst signal (see signal (j) in FIG. 6). As described above, the optical burst signal can be relayed while maintaining its accurate code form. The process when one SD signal ends and the next SD signal enters later than the time when the reset time Trst has elapsed, that is, when the optical burst signal does not continuously enter is shown in FIG. I will explain.
  • the burst reception signal is delayed as described above, but the continuous burst reception determination signal is not generated (see the left part of the signal (d) in FIG. 6). Accordingly, a switching signal is sent to the switching unit 75 based on the delayed SD signal (see signal (h) in FIG. 6), and the head portion of the delayed burst reception signal is switched to the synchronization pattern signal. By this processing, the beginning part of the burst reception signal which may be damaged can be replaced with the synchronization pattern signal.
  • the burst signal When the burst signal is not continuous and the portion before the SD signal is detected is complemented and relayed, the burst signal may collide on the station side device (OLT) side rather than the relay device.
  • OLT station side device
  • the relay signal from the relay device 7 and the burst signal 6d from the slave station ONU 3d may collide, and this collision can be avoided.
  • the synchronization pattern holding unit 74 includes, for example, a memory that holds a synchronization pattern, and the synchronization pattern is repeatedly read with the reference clock of the optical signal relay device 7.
  • the switching unit 75 includes, for example, a 2: 1 (2 inputs, 1 output) selector circuit.
  • the timing control unit 77 includes, for example, a logic circuit that operates with the reference clock of the optical signal relay device 7, and can control the timing with the accuracy of the reference clock.
  • the continuous burst signal reception determination unit 72 also includes, for example, a logic circuit that operates with the reference clock of the optical signal relay device 7 and performs determination in units of reference clock.
  • Optical communication system 2 Station side equipment (OLT) 3.
  • Home unit (ONU) 4
  • Optical fiber 5
  • Optical burst signal 7
  • Optical signal repeater 9
  • Personal computer 71
  • Optical / electrical module 72
  • Continuous burst reception determination unit 73
  • Delay buffer unit 74
  • Synchronization pattern holding unit 75
  • Switching unit 76
  • Electric / optical module 77
  • Timing Control unit 81
  • Binarization unit 83
  • Peak hold circuit (intensity detection circuit) 84
  • Signal Detection Unit 711
  • Preamplifier 713
  • Postamplifier 84

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  • Signal Processing (AREA)
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  • Small-Scale Networks (AREA)

Abstract

La présente invention concerne un appareil de relais de signaux optiques comportant: un module de conversion opto-électrique qui convertit un signal de salve optique reçu en un signal de réception de salve; une unité de détection de signaux qui délivre un signal de détection de signal (SD) pendant qu'elle détecte le signal de réception de salve converti et qui entame, lorsqu'elle détecte la fin d'un signal de réception de salve, la détection du signal de réception de salve suivant après qu'un temps de réinitialisation prédéterminé s'est écoulé; une unité de tampon de retard qui accumule et retarde le signal de réception de salve émanant du module opto-électrique et délivre le signal de réception de salve retardé; et une unité de détermination qui surveille la sortie émanant de l'unité de détection de signaux et qui délivre un signal de détermination de réception de salve continue pendant un temps prédéterminé dans le cas où, après qu'un signal de SD s'est terminé, il est déterminé que le signal de SD suivant est détecté lorsque le temps de réinitialisation est écoulé. L'appareil de relais de signaux optiques comporte en outre: une unité de commande de temporisation qui réalise une commande telle qu'un diagramme de synchronisation du signal de réception de salve retardé émanant de l'unité de tampon est commuté vers un signal de diagramme de synchronisation sur une période pendant laquelle le signal de détermination de réception de salve continue est présent.
PCT/JP2016/087392 2016-04-12 2016-12-15 Appareil de relais de signaux optiques et procédé de relais Ceased WO2017179241A1 (fr)

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EP3984585A4 (fr) * 2019-06-11 2022-07-27 FUJIFILM Corporation Unite ensemble de micro-aiguilles et contenant associe
JP2023119083A (ja) * 2022-02-16 2023-08-28 三菱電機株式会社 光通信装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002271271A (ja) * 2001-03-06 2002-09-20 Hitachi Ltd 再生中継方法及び再生中継装置
JP2007184908A (ja) * 2005-12-09 2007-07-19 Furukawa Electric Co Ltd:The 光伝送システム
JP2007221688A (ja) * 2006-02-20 2007-08-30 Sumitomo Electric Ind Ltd 光信号中継装置及び中継方法
JP2010534989A (ja) * 2007-08-10 2010-11-11 華為技術有限公司 受動光ネットワークにおいてデータ伝送延長を実現する方法、システム、及び装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002271271A (ja) * 2001-03-06 2002-09-20 Hitachi Ltd 再生中継方法及び再生中継装置
JP2007184908A (ja) * 2005-12-09 2007-07-19 Furukawa Electric Co Ltd:The 光伝送システム
JP2007221688A (ja) * 2006-02-20 2007-08-30 Sumitomo Electric Ind Ltd 光信号中継装置及び中継方法
JP2010534989A (ja) * 2007-08-10 2010-11-11 華為技術有限公司 受動光ネットワークにおいてデータ伝送延長を実現する方法、システム、及び装置

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