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WO2016000183A1 - Procédé et dispositif d'alignement de longueur d'onde d'un laser, onu, olt et système de pon - Google Patents

Procédé et dispositif d'alignement de longueur d'onde d'un laser, onu, olt et système de pon Download PDF

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Publication number
WO2016000183A1
WO2016000183A1 PCT/CN2014/081289 CN2014081289W WO2016000183A1 WO 2016000183 A1 WO2016000183 A1 WO 2016000183A1 CN 2014081289 W CN2014081289 W CN 2014081289W WO 2016000183 A1 WO2016000183 A1 WO 2016000183A1
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WIPO (PCT)
Prior art keywords
optical power
laser
power spectrum
point
indicated
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Ceased
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PCT/CN2014/081289
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English (en)
Chinese (zh)
Inventor
陈健
王衡
徐之光
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN201480012297.1A priority Critical patent/CN105409073B/zh
Priority to PCT/CN2014/081289 priority patent/WO2016000183A1/fr
Publication of WO2016000183A1 publication Critical patent/WO2016000183A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
    • H01S5/12—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region the resonator having a periodic structure, e.g. in distributed feedback [DFB] lasers
    • H01S5/125—Distributed Bragg reflector [DBR] lasers

Definitions

  • the present invention relates to communication technologies, and in particular, to a wavelength alignment method and apparatus for a laser, 0NU
  • a tunable laser is a laser that can adjust the wavelength of an outgoing light, such as a distributed Bragg reflective (DBR) laser.
  • the tunable laser can be placed in a Passive Optical Network (PON) system.
  • the Optical Network Unit (0NU) can also be installed in an Optical Line Terminal (0LT).
  • the DBR laser includes a gain region for emitting light waves, and a phase shift region and a DBR region are sequentially disposed in the opposite direction of the light exiting the gain region.
  • MUX multiplexer
  • an injection current (I DBR ) and a phase shift region are injected into the DBR region (I Phas J.
  • a mapping relationship between a laser parameter and an outgoing light wavelength is established, so that when the wavelength of the laser is aligned, the laser parameter corresponding to the desired outgoing light wavelength is determined according to the mapping relationship table.
  • the required wavelength must be predicted, and then the wavelength alignment of the laser can be performed according to the foregoing mapping table.
  • the operation process is cumbersome and requires manual participation.
  • the mapping relationship between the laser parameters and the wavelength of the outgoing light is established. The cost of the watch is higher, thereby increasing the cost of the laser. Summary of the invention
  • Embodiments of the present invention provide a wavelength alignment method and apparatus for a laser, 0NU, 0LT, and PON systems, which avoid using a mapping relationship between laser parameters and outgoing light wavelengths, and determining parameters of the DBR laser to reduce the cost of the DBR laser. .
  • the first aspect provides a method for wavelength alignment of a laser, comprising: adjusting a phase injection current Ip of a laser or a temperature of a gain region in an adjustment range to obtain an optical power spectrum of the laser, the optical power spectrum indicating laser
  • the outgoing light is the optical signal emitted by the laser through a part of the mirror and the wavelength division multiplexer MUX, reaching the second a partial mirror, reflected by the second partial mirror and passing through the MUX to the first partial mirror, to obtain reflected light
  • the emitted light is an optical signal emitted by the laser through the MUX , the obtained transmitted light; determining the optical power spectrum with the best axial symmetry from the obtained optical power spectrum as the target optical power spectrum; determining the target optical power spectrum corresponding to the I phas6 or the temperature of the gain region, and the target At least two of the I DBRs indicated by the peak points in the optical power
  • determining, from the obtained optical power spectrum, an optical power spectrum with optimal axial symmetry as a target optical power spectrum comprising: calculating each optical power spectrum
  • the I DBR indicated by the mode hopping point, / m is the I DBR indicated by the peak point of the optical power spectrum ; the first hopping point is the hop closest to the peak point of the optical power spectrum along the I direction.
  • a second mode hopping point is a mode hopping point that is closest to a peak point of the optical power spectrum along the I direction; in each of the optical power spectra, the optical power spectrum having the smallest symmetry value is used as a symmetry The best target optical power spectrum.
  • the adjusting the phase region of the laser to inject the current I or the gain region Temperature obtaining the optical power spectrum of the laser, comprising: adjusting the temperature of the Ip or the gain region according to a preset length within the adjustment range, and measuring the optical power spectrum; determining the measurement for each measured optical power spectrum Whether the obtained optical power spectrum satisfies the first determining condition, the second determining condition, and the third determining condition; if the measured optical power spectrum satisfies the first determining condition, the second determining condition, and the third determining condition, Determining the measured optical power spectrum as the obtained optical power spectrum; if the measured optical power spectrum does not satisfy the first determination condition, and the obtained optical power spectrum already exists, stopping the measurement;
  • the first determining condition is that the optical power of the reflected light indicated by the peak point of the optical power spectrum is greater than a first threshold, and the first threshold is based on the optical power and reflection
  • the second determining condition is that the absolute value of the optical power difference of the reflected light between the first mode hopping point and the second hopping point is less than a second threshold,
  • the second threshold is a symmetric value of the optical power spectrum according to the optical power of the laser and the isolation of the reflected light on the optical transmission link MUX.
  • the optical power of the reflected light indicated by the mode hopping point is greater than the at least one of the hopping points
  • the optical power of the reflected light indicated by the adjacent neighboring point and the difference between the optical power indicated by the adjacent point is greater than a fourth threshold; the fourth threshold is based on the optical power of the laser and the MUX
  • the isolation is determined.
  • the first possible implementation of the first aspect, the second possible implementation of the first aspect, and the third possible implementation of the first aspect, the fourth possibility in the first aspect In an implementation manner, at least two parameters of the I Ph ⁇ or the gain region corresponding to the determined target optical power spectrum and the I indicated by the peak point in the target optical power spectrum are used as parameters of the adjustment laser After that, the method further includes: transmitting the parameter of the adjustment laser.
  • the sending the parameter of the adjusting laser comprises: sending a physical layer operation management and maintaining a PL0AM message;
  • the reserved Reserve field in the PL0AM message or the Tuning Control Tuning Control field in the PL0AM message carries the parameters of the adjustment laser.
  • a second aspect provides a wavelength aligning device for a laser, comprising: an obtaining module, configured to adjust a phase of a laser to inject a current I or a temperature of a gain region, to obtain an optical power spectrum of the laser, the optical power spectrum indicating a laser
  • the emitted light is the optical signal emitted by the laser, and passes through a part of the mirror and the wavelength division multiplexer MUX to reach the first a two-part mirror, which is reflected by the second partial mirror and reaches the first partial mirror through the MUX, and obtains reflected light; or, the emitted light is an optical signal emitted by the laser,
  • the MUX the obtained transmitted light
  • a determining module configured to determine an optical power spectrum with the best axial symmetry from the obtained optical power spectrum as a target optical power spectrum
  • a parameter module for corresponding to the determined target optical power spectrum The temperature of the I or gain
  • the determining module includes: a calculating unit, configured to calculate a symmetric value of each optical power spectrum + I is an I DBR , / indicated by the third modulus point.
  • the dish is the I DBR indicated by the second mode point, / m is the i DBR indicated by the peak point of the optical power spectrum ;
  • the first mode hop point is the peak of the optical power spectrum along the I, decreasing direction distance Pointing the nearest mode hopping point;
  • the second hopping point is a mode hopping point closest to the peak point of the optical power spectrum along the increasing direction; and determining means for minimizing each of the optical power spectra Symmetrical value of light work
  • the rate spectrum is used as the best target optical power spectrum for symmetry.
  • the obtaining module is specifically configured to adjust according to a preset length within the adjustment range Ip or the temperature of the gain region, measuring the optical power spectrum; determining, for each measured optical power spectrum, whether the measured optical power spectrum satisfies the first determining condition, the second determining condition, and the third determining condition; The measured optical power spectrum satisfies the first determining condition, the second determining condition, and the third determining condition, and the measured optical power spectrum is taken as the obtained optical power spectrum; if the measured optical power If the spectrum does not satisfy the first determining condition, and the obtained optical power spectrum already exists, the measurement is stopped; wherein the first determining condition is that the optical power of the outgoing light indicated by the peak point of the optical power spectrum is greater than the first a threshold, the first threshold is determined according to an optical power of the laser and an optical loss of the outgoing light in the optical transmission link; the second determining condition is between the first mode
  • the I DBR , the third threshold is determined according to the optical power of the laser, the range of the I DBR , the channel bandwidth of the MUX, and the isolation of the MUX.
  • the calculating unit is specifically configured to calculate a symmetric value of each optical power spectrum + I; wherein 1 is a first mode hop point indicated I DBR, / 2 is the second mode hop point indicated I DBR, / m is the optical power spectrum of the peak point marked I DBR; the first mode hopping The point is a mode hopping point that is closest to the peak point of the optical power spectrum along the I direction; the second hopping point is a mode hopping point that is closest to the peak point of the optical power spectrum along the I DBR increasing direction; The optical power of the outgoing light indicated by the mode hopping point is greater than the optical power of the outgoing light indicated by at least one adjacent point adjacent to the hopping point, and the difference between the optical power indicated by the adjacent point is greater than a fourth threshold; the fourth threshold is determined according to an optical power of the laser and an isolation of the MUX.
  • the device further includes:
  • a sending module configured to send the parameter of the adjusting laser.
  • the sending module is specifically configured to send a physical layer operation management and maintain a PL0AM message; a reserved reserve field in the PL0AM message or an adjustment control in the PL0AM message
  • the Tuning Control field carries the parameters of the adjustment laser.
  • a third aspect provides an optical network unit ONU, including: a laser, a first partial mirror, a second partial mirror, a wavelength division multiplexer MUX, and a photodiode PD, wherein the laser passes through the first partial mirror,
  • the MUX is connected to the second partial mirror, and the PD is connected to the first partial mirror;
  • the ONU further includes: a processor, connected to the PD and the laser; Outputting an optical signal within an adjustment range according to an instruction of the processor;
  • the PD configured to detect, by the first partial mirror and the MUX, an optical signal emitted by the laser to reach a second partial reflection a mirror, the reflected light reflected by the second partial mirror and passing through the MUX to the first partial mirror, obtaining optical power of the reflected light, and transmitting the optical power of the reflected light to the processor;
  • the processor is configured to indicate that the laser is within an adjustment range, and adjusts a phase of the laser to inject a current I or a temperature of a
  • the determining, by the processor, the optical power spectrum with the best axis symmetry from the obtained optical power spectrum as the target optical power spectrum specifically: the processing Calculates the symmetry value of each optical power spectrum + I is the first mode hopping point
  • Marked I DBR 2 is the second mode hop point indicated I DBR, / m is the optical power spectrum indicated a peak point i DBR; mode hopping of the first point along an decrease direction distance a mode hopping point closest to a peak point of the optical power spectrum; the second hopping point is a mode hopping point closest to a peak point of the optical power spectrum along an I DBR increasing direction; the processor is in each of the optical power spectra In the optical power spectrum with the smallest symmetry value, the target optical power spectrum with the best symmetry is used.
  • the processor indicates that the laser is within an adjustment range, and adjusts a phase of the laser Injecting the current Ip or the temperature of the gain region to obtain the optical power spectrum of the laser
  • the method specifically includes: the processor instructing the laser to be within an adjustment range and adjusting according to a preset length
  • the processor determines the measured optical power spectrum for each measured optical power spectrum Whether the first judgment condition, the second judgment condition, and the third judgment condition are satisfied; if the measured optical power spectrum satisfies the first determination condition, the second determination condition, and the third determination condition, the measured light is a power spectrum as the obtained optical power spectrum; if the measured optical power spectrum does not satisfy the first determination condition, and the obtained optical power spectrum already exists, stopping the measurement; wherein, the first Judge The threshold is determined according to the optical power of the laser and the optical loss of the reflected light in the optical transmission link; the second determining condition is the optical power difference of the reflected light between the first mode hopping point and the second mode hopping point.
  • the absolute value is smaller than the second threshold, and the second threshold is determined according to the optical power of the laser, the optical loss of the reflected light in the optical transmission link, and the isolation of the MUX; the third determining condition is a pair of optical power spectra.
  • I DBR indicated by the second mode hop, / m is the I DBR indicated by the peak point, and the third threshold is based on the laser power, the range of values of I, the channel bandwidth of the MUX, and the isolation of the MUX. Degree determined.
  • the optical power of the reflected light indicated by the mode hopping point is greater than the at least one of the hopping points
  • the optical power of the reflected light indicated by the adjacent neighboring point and the difference between the optical power indicated by the adjacent point is greater than a fourth threshold; the fourth threshold is based on the optical power of the laser and the MUX The isolation is determined.
  • the ONU further includes: a driving circuit; the driving circuit is connected to the processor and the laser, and is configured to adjust the laser within an adjustment range according to an instruction of the processor The phase region injects a current Ip or a temperature of the gain region; and the laser emits an optical signal under the driving of the driving circuit.
  • a fourth aspect provides an optical line terminal OLT, including: a laser, a first partial mirror, a second partial mirror, a wavelength division multiplexer MUX, and a photodiode PD, wherein the laser passes through the first partial mirror,
  • the MUX is connected to the second partial mirror, and the PD is connected to the first partial mirror;
  • the OLT further includes: a processor, connected to the PD and the laser; Outputting an optical signal within an adjustment range according to an instruction of the processor;
  • the PD configured to detect, by the first partial mirror and the MUX, an optical signal emitted by the laser to reach a second partial reflection a mirror, the reflected light reflected by the second partial mirror and passing through the MUX to the first partial mirror, obtaining optical power of the reflected light, and transmitting the optical power of the reflected light to the processor;
  • the processor is configured to indicate that the laser is within an adjustment range, and adjusts a phase of the laser to inject a current I or a temperature of a
  • the determining, by the processor, the optical power spectrum with the best axis symmetry from the obtained optical power spectrum as the target optical power spectrum specifically includes: the processor Calculate the symmetry value of each optical power spectrum + I
  • the dish is the I DBR indicated by the second mode point, / m is the I DBR indicated by the peak point of the optical power spectrum ;
  • the first mode hop point is the peak of the optical power spectrum along the decreasing direction of the I DBR Pointing the nearest mode hopping point;
  • the second hopping point is a mode hopping point that is closest to the peak point of the optical power spectrum along the increasing direction; the processor will have the smallest among the optical power spectra
  • the optical power spectrum of the symmetry value is used as the symmetrical optimal target optical power spectrum.
  • the processor indicates that the laser is within an adjustment range, and adjusts a phase of the laser Injecting the current Ip or the temperature of the gain region to obtain the optical power spectrum of the laser
  • the method specifically includes: the processor instructing the laser to adjust the temperature of the Iphas6 or the gain region according to a preset length within the adjustment range, and Instructing the PD to measure the optical power of the reflected light to measure an optical power spectrum; the processor determining, for each measured optical power spectrum, whether the measured optical power spectrum satisfies a first determining condition, a second determination condition and a third determination condition; if the measured optical power spectrum satisfies the first determination condition, the second determination condition, and the third determination condition, the measured optical power spectrum is taken as the obtained light a power spectrum; if the measured optical power spectrum does not satisfy the first determining condition, and the obtained optical power spectrum already exists, stopping the measurement; wherein, the processor instructing the laser to adjust the temperature of the Iphas6 or the gain region according to a preset length within the
  • I is less than a third threshold, wherein I DBR 1 is indicated by the first mode hop point
  • I DBR indicated by the second mode hop, / m is the I DBR indicated by the peak point, and the third threshold is based on the laser power, the range of values of I, the channel bandwidth of the MUX, and the isolation of the MUX. Degree determined.
  • the optical power of the reflected light indicated by the jumping mode point is greater than the at least one of the jumping mode points
  • the optical power of the reflected light indicated by the adjacent neighboring point and the difference between the optical power indicated by the adjacent point is greater than a fourth threshold; the fourth threshold is based on the optical power of the laser and the MUX Isolation
  • the 0LT further includes: a driving circuit; the driving circuit, and the processing And the laser is connected to adjust a phase injection current Ip or a temperature of the gain region of the laser within an adjustment range according to an indication of the processor; the laser is driven by the driving circuit , the light signal is emitted.
  • a fifth aspect provides an optical line terminal OLT comprising: a wavelength division multiplexer MUX, a receiver, a transmitter, and a processor; wherein the processor is respectively connected to the receiver and the transmitter; a receiver for detecting an optical signal emitted by the laser through the transmitted light of the MUX to obtain optical power of the transmitted light; the processor, configured to instruct the laser to adjust a phase region injection within an adjustment range a current I Phas6 or a temperature of the gain region, the optical power spectrum of the laser is obtained, the optical power spectrum indicating a correspondence between a current I of a Bragg reflection region of the laser and an optical power of the transmitted light obtained by the receiver; Obtaining an optical power spectrum with the best axial symmetry in the obtained optical power spectrum as the target optical power spectrum; determining the temperature of the I or gain region corresponding to the target optical power spectrum, and the peak point in the target optical power spectrum I, at least two parameters are used as parameters for adjusting the laser; and the transmitter is configured to transmit parameters of the adjustment laser.
  • the determining, by the processor, the optical power spectrum with the best axis symmetry from the obtained optical power spectrum as the target optical power spectrum specifically includes:
  • I DBR , / 2 is the I DBR indicated by the second mode hopping point
  • ⁇ is the i DBR of the peak point of the optical power spectrum marked with /"
  • the first mode hopping point is decreased along 1, a mode hopping point that is closest to a peak point of the optical power spectrum
  • the second hopping point is a mode hopping point that is closest to a peak point of the optical power spectrum along an I DBR increasing direction
  • the processor is in each of the light In the power spectrum, the optical power spectrum with the smallest symmetry value is taken as the target optical power spectrum with the best symmetry.
  • the processor in the adjustment range, instructs the laser to adjust the phase region injection current Ip or gain The temperature of the region, obtaining the optical power spectrum of the laser, specifically: the processor is within the adjustment range, instructing the laser to adjust the temperature of the Ip or the gain region according to a preset length, and measuring the optical power spectrum; Determining, for each measured optical power spectrum, whether the measured optical power spectrum satisfies a first determining condition, a second determining condition, and a third determining condition; if the measured optical power spectrum satisfies the first determination a condition, the second determining condition, and the third determining condition, storing the measured optical power spectrum; if the measured optical power spectrum does not satisfy the first determining condition, and the obtained The optical power spectrum is used to stop the measurement; wherein the first determining condition is that the optical power of the transmitted light indicated by the peak point of the optical power spectrum is greater than a first determining condition
  • T + I is less than the third threshold, where /. I DBR indicated by the first hop point, 1 is
  • the I DBR indicated by the second mode hopping point, / m is the I DBR indicated by the peak point, and the third threshold is based on the optical power of the laser, the range of the I DBR , the channel bandwidth of the MUX, and the isolation of the MUX. definite.
  • the optical power of the reflected light indicated by the jumping mode point is greater than the at least one of the jumping mode points
  • the optical power of the reflected light indicated by the adjacent neighboring point and the difference between the optical power indicated by the adjacent point is greater than a fourth threshold; the fourth threshold is based on the optical power of the laser and the MUX The isolation is determined.
  • the sending, by the sending, the parameter of the adjusting laser specifically: the sending, by the sending, the physical layer operation management and the maintenance of the PL0AM message; the reserved Reserve field in the PL0AM message or the PL0AM message
  • the adjustment controller Tuning Control field carries the parameters of the adjustment laser.
  • a sixth aspect is to provide a passive optical network PON system, including the optical line terminal OLT as described in the fifth aspect, and an optical network unit ONN; the OLT is connected to the ONU; The indication of 0LT is to adjust the phase injection current I Pha of the laser or the temperature of the gain region; and receive the parameters of the adjustment laser transmitted by the OLT, and perform wavelength alignment according to the parameters of the adjustment laser.
  • the wavelength alignment method and device for the laser provided by the embodiment of the present invention, the 0NU, 0LT , and PON systems adjust the temperature of the I Phas6 or the gain region of the laser by adjusting the range.
  • the optical power spectrum of the optical device, and then determining the optical power spectrum with the best axial symmetry from the respective optical power spectra as the target optical power spectrum, the I P or the temperature of the gain region corresponding to the determined target optical power spectrum, and the target light At least two parameters of the I DBR indicated by the peak points in the power spectrum are used as parameters for adjusting the laser, thereby avoiding the use of a mapping table between the laser parameters and the wavelength of the emitted light, determining the parameters of the adjustment laser, and reducing the cost of the laser.
  • Figure 1 is a schematic view showing the structure of a DBR laser
  • FIG. 2 is a schematic flow chart of a method for wavelength alignment of a laser according to a first embodiment of the present invention
  • Figure 3 is an optical path diagram of reflected light
  • FIG. 4 is a schematic structural view of a wavelength aligning device for a laser according to a second embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a 0NU according to a third embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of an 0LT according to a fourth embodiment of the present invention.
  • FIG. 7 is a schematic flowchart of a wavelength alignment method of a laser according to a fifth embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a wavelength aligning device for a laser according to a sixth embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a 0LT 90 according to a seventh embodiment of the present invention
  • FIG. 10 is a schematic structural diagram of a P0N system according to an eighth embodiment of the present invention.
  • the DBR laser is a tunable laser, including a gain region for emitting light waves, and a phase shift region and a DBR region are sequentially disposed in the opposite direction of the light exiting the gain region.
  • FIG. 1 is a schematic structural view of the DBR laser, as shown in FIG. The method includes: a gain region, a phase shift region, and a DBR region, wherein the DBR region includes a DBR grating for performing DBR reflection on the light wave phase-shifted by the phase shift region.
  • DBR lasers can not only Using I Ph ⁇ and I, these two parameters adjust the wavelength of the light emitted by the DBR laser; in the implementation process, for the sake of simplicity, the temperature of the gain region and the two parameters can be adjusted to adjust the wavelength of the light emitted by the DBR laser.
  • the wavelength is aligned, that is, the wavelength of the exiting light of the laser is matched to the pass band of the MUX.
  • the lasers mentioned in the following embodiments may each be a DBR laser.
  • optical power spectra mentioned in the following embodiments are all used to indicate the correspondence between the I of the laser and the optical power of the emitted light of the laser.
  • the emitted light may be an optical signal emitted by the laser passing through a part of the mirror and the MUX, reaching the second partial mirror, being reflected by the second partial mirror and passing through the MUX to the first partial mirror, and the obtained reflected light;
  • the embodiment can be referred to the following first embodiment, second embodiment, third embodiment and fourth embodiment.
  • the emitted light may be a transmitted light obtained by passing the optical signal emitted by the laser through the MUX; and the fifth embodiment, the sixth embodiment, the seventh embodiment, and the eighth An embodiment.
  • FIG. 2 is a schematic flowchart of a method for wavelength alignment of a laser according to a first embodiment of the present invention.
  • the method in this embodiment may be implemented by the ONU to perform wavelength alignment on a laser in the ONU, or may be implemented by 0LT.
  • the implementation is performed to perform wavelength alignment on the laser in the OLT.
  • the embodiment may include:
  • the optical power spectrum is established in a two-dimensional Cartesian coordinate system, the horizontal axis indicates the injection current I DBR of the DBR region, and the vertical axis indicates the optical power of the reflected light, which is used to indicate the injection current I DBR and the vertical axis of the DBR region indicated by the horizontal axis.
  • the reflected light is obtained by the partial mirror reflection of the portion of the DBR laser that is transmitted through the MUX.
  • FIG. 3 is an optical path diagram of the reflected light. As shown in FIG.
  • the laser 30 passes through A part of the mirror 31, the MUX 33 and the second partial mirror 32 are connected, a photodiode (PD) 34 is connected to the first partial mirror 31, and the emitted light of the laser 30 passes through the first partial mirror 31 and the MUX 33 to reach the second
  • the first partial mirror 31 may be a polarization beam splitter (PBS, Polarization Beam Splitter) or a beam splitter or the like
  • the second partial mirror 32 may be a Faraday Rotation Mirror (F body, Faraday Rotation Mirror), etc.; Think of Array Wave Grat ing (AWG).
  • the temperature of the Ip or the gain region of the laser is gradually increased or decreased, and the adjustment is performed according to a preset length, and each Ip is measured. Or the optical power spectrum corresponding to the temperature of the gain region.
  • the steps A and B are repeatedly performed until the measured optical power spectrum does not satisfy the first determination condition, and the obtained optical power spectrum already exists, then the measurement is stopped:
  • Step A In the adjustment range, the temperature of the Ip or the gain zone is gradually increased or gradually decreased, and adjusted according to the preset length, and the optical power spectrum corresponding to the temperature of the current Ip or the gain zone is measured;
  • Step B determining whether the measured optical power spectrum satisfies a first determining condition, a second determining condition, and a third determining condition; if the measured optical power spectrum satisfies a first determining condition, a second determining condition, and In the third determination condition, the measured optical power spectrum is taken as the obtained optical power spectrum.
  • the first determining condition is that the optical power of the reflected light indicated by the peak point of the optical power spectrum is greater than a first threshold, and the first threshold is based on the optical power of the laser and the light of the reflected light in the optical transmission link. Determining the loss; the second determining condition is that the absolute value of the optical power difference of the reflected light between the first mode hopping point and the second hopping point is less than a second threshold, and the second threshold is based on the optical power of the laser
  • the three judgment conditions of the reflected light on the optical transmission link are the symmetric values of the optical power spectrum.
  • the value range, the channel bandwidth of the MUX, and the isolation of the MUX are determined.
  • the optical power spectrum is filtered by using the first determining condition, the second determining condition, and the third determining condition in the process of obtaining the optical power spectrum, and the light obtained by the current test is selected when the optical power spectrum satisfying the above three conditions is selected. At the power spectrum, the test is stopped, thereby accelerating the progress of obtaining the optical power spectrum.
  • the first mode hop point is along I.
  • the BR reduces a mode hopping point that is closest to a peak point of the optical power spectrum; the second hopping point is a mode hopping point that is closest to the peak point in an I DBR increasing direction.
  • the optical power of the reflected mode of the reflected mode is greater than the optical power of the reflected light indicated by the adjacent point adjacent to the jumping point, and the optical power indicated by the adjacent point
  • the difference is greater than a fourth threshold, wherein the fourth threshold is determined according to the optical power of the DBR laser and the isolation of the MUX, such as: taking a fourth threshold of 8 dB.
  • the interval between the main mode and the side mode of the three-stage DBR laser generally exceeds the channel bandwidth of the MUX. When the main mode is located near the bandwidth of the MUX channel, the side mode will fall on the channel.
  • the side mode transmittance is very low, and a significant optical power abrupt change can be detected, which is generally a tens of dB change, so that the first mode hop point can be clearly detected.
  • the position of the second-hop mode point is 0 2
  • the center point 0 between the two mode-hopping points is generally the place where the Side Mode Suppression Ratio (SSR) is the largest.
  • SSR Side Mode Suppression Ratio
  • the dish is the i DBR indicated by the second mode point, / m is the i DBR indicated by the peak point. Determining the mode hopping point in this way allows the wavelength aligned laser to have a higher SMSR.
  • the i Ph ⁇ or gain zone temperature of the laser when the target optical power spectrum is measured, and the I DBR indicated by the peak point in the target optical power spectrum are used as parameters of the adjustment laser to implement the laser Wavelength alignment.
  • the emission-eye reduction ratio of the wavelength-aligned laser can also be adjusted.
  • ER emission eye extinction ratio
  • a laser driver LDD, LD Driver
  • LDD laser driver
  • extinction ratio monitoring and adjustment function given ER value
  • LDD can adjust the ER to the set value.
  • the emitted light indicating a series of "1" and "0" signals is transmitted at a certain frequency, and the respective indications "1” and "0" reflected by the Faraday rotating mirror are monitored. "The optical power of the outgoing light and P.
  • El ⁇ lOlg d/Pa) (dB), that is, the ER can be adjusted by changing the modulation and bias current of the DBR laser. Sending a string of "1" and "0" at a certain frequency is for more accurate measurement of the ER.
  • 201 it may also include: Performing a factory inspection of the laser. Specifically, if the temperature range of the gain region of the laser is , 2 ), generally 0 ⁇ 1 2 -1 ⁇ 10, and the range of I phasE is (I P1 , I P2 ), and the range of I DBR is (I D1 , I D2 ) , where T ⁇ T 2 , I P1 ⁇ I P2 , I D1 ⁇ I D2 , then the temperature in the gain region of the laser is T 2 , 1 ⁇ is I D1
  • a fifth threshold such as: taking a fifth threshold of 35 dB; operating temperature of the laser is T 2 , 1, Under the condition of I D2 , by adjusting I phas 6 , a second exit light that satisfies the exit mode of the laser and has a side mode suppression ratio greater than
  • corresponds to the wavelength adjustable range ( , ⁇ 2 ) , ⁇ 3 - ⁇ 4
  • the wavelength adjustable range of the emitted light of the laser can cover the channel bandwidth of all channels in the MUX, that is, determine that the laser matches the MUX.
  • the wavelength alignment method of the laser determines the optical power spectrum of the laser by adjusting the temperature of the I P or the gain region of the laser within the adjustment range, and then determines the most axial symmetry from each optical power spectrum.
  • the good optical power spectrum is the target optical power spectrum, and the temperature of the Ip or the gain region corresponding to the determined target optical power spectrum, and at least two parameters of the I DBR indicated by the peak point in the target optical power spectrum are used as parameters for adjusting the laser. Therefore, the mapping between the laser parameters and the wavelength of the emitted light is avoided, and the parameters of the laser are determined to reduce the cost of the laser.
  • 4 is a schematic structural diagram of a wavelength aligning device for a laser according to a second embodiment of the present invention.
  • the wavelength aligning device provided in this embodiment may be disposed in the 0LT to perform wavelength alignment on the laser in the 0LT.
  • the wavelength alignment device of the laser in the ONU can also be disposed in the ONU.
  • the wavelength alignment device of the laser in this embodiment includes: an obtaining module 41, a determining module 42 and a parameter module 43.
  • the obtaining module 41 is configured to adjust the phase of the laser injection current I Ph ⁇ or the temperature of the gain region within the adjustment range to obtain an optical power spectrum of the laser.
  • the optical power spectrum indicates a correspondence between the current I of the Bragg reflection region of the laser and the optical power of the reflected light of the laser; the reflected light is emitted by the laser through the first partial mirror and the MUX Reaching the second partial mirror, reflected by the second partial mirror and reaching the first partial mirror through the MUX, obtained by the PD detection.
  • the obtaining module 41 is specifically configured to: in the adjustment range, adjust the temperature of the I or the gain region according to the preset length, and measure the optical power spectrum; and determine, for each measured optical power spectrum, the measured Whether the optical power spectrum satisfies the first determining condition, the second determining condition, and the third determining condition; if the measured optical power spectrum satisfies the first determining condition, the second determining condition, and the third determining condition, the measuring Obtaining an optical power spectrum as the obtained optical power spectrum; if the measured optical power spectrum does not satisfy the first determination condition, and the obtained optical power spectrum already exists, stopping the measurement;
  • the first determining condition is that the optical power of the reflected light indicated by the peak point of the optical power spectrum is greater than a first threshold, and the first threshold is determined according to the optical power of the laser and the optical loss of the reflected light in the optical transmission link.
  • the second determining condition is that the absolute value of the optical power difference of the reflected light between the first mode hopping point and the second hopping point is less than a second threshold, and the second threshold is based on the optical power of the laser, Light loss in the optical transmission link and determine the MUX isolation;
  • third determination condition is a mode-hopping point
  • the labeled I DBR 2 is the i DBR indicated by the second mode hop point, / m is the I DBR indicated by the peak point, and the third threshold is based on the laser light output power, I, the value range, and the MUX channel. The bandwidth and the isolation of the MUX are determined.
  • the determining module 42 is coupled to the obtaining module 41 for determining an optical power spectrum having the best axis symmetry from the obtained optical power spectrum as a target optical power spectrum.
  • the determining module may include: a calculating unit, configured to calculate each optical power spectrum
  • the i DBR indicated by the mode point, / m is the i DBR indicated by the peak point of the optical power spectrum ;
  • the first mode hopping point is the mode hop closest to the peak point of the optical power spectrum along the decreasing direction of the I DBR Point;
  • the second mode hopping point is a mode hopping point which is closest to the peak point of the optical power spectrum along the I direction;
  • the determining unit is configured to, in each of the optical power spectra, the light having the smallest symmetry value The power spectrum is used as the best target optical power spectrum for symmetry.
  • the optical power of the reflected light indicated by the mode hopping point is greater than the optical power of the reflected light indicated by at least one adjacent point adjacent to the hopping point, and the optical power indicated by the adjacent point is The difference is greater than a fourth threshold; the fourth threshold is determined according to the optical power of the laser and the isolation of the MUX.
  • a parameter module 43 is connected to the determining module 42 and configured to correspond to the determined target optical power spectrum
  • the temperature of the Ip or gain region, and at least two of the I, indicated by the peak point in the target optical power spectrum, are used as parameters for adjusting the laser.
  • the functional modules of the wavelength aligning device of the laser provided in this embodiment are used to perform the wavelength aligning method of the laser shown in the first embodiment.
  • the specific working principle is not described here. For details, refer to the description of the method embodiment.
  • the optical power spectrum of the laser is obtained, and then the optical power spectrum with the best axial symmetry is determined from each optical power spectrum as the target optical power.
  • the spectrum, the Ip or the temperature of the gain region corresponding to the determined target optical power spectrum, and the I indicated by the peak point in the target optical power spectrum, at least two parameters are used as parameters for adjusting the laser, thereby avoiding the use of laser parameters and outgoing light wavelengths.
  • the mapping table determines the parameters of the laser and reduces the cost of the laser.
  • FIG. 5 is a schematic structural diagram of a 0NU according to a third embodiment of the present invention, including: a laser 51, a first partial mirror 52, a second partial mirror 53, an MUX 54 and a PD 55, and the 0NU further includes a processor 56.
  • the laser 51 is connected by the first partial mirror 52, the MUX 54 and the second partial mirror 53, the PD 55 is connected to the first partial mirror 52, and the processor 56 and the PD 55 and the The laser 51 is connected.
  • the connection between the processor 56 and the PD 55 and the laser 51 is electrically connected; the laser 51 passes through the connection between the first partial mirror 52, the MUX 54 and the second partial mirror 53, And the connection between the PD 55 and the first partial mirror 52 is an optical connection.
  • the solid line is an electrical connection
  • the solid arrow line is an optical connection
  • the direction of the arrow is a light propagation direction.
  • the laser 51 is configured to emit an optical signal within an adjustment range according to an indication of the processor 56.
  • the PD 55 is configured to detect emission by the laser 51 through the first partial mirror
  • the processor 56 is configured to instruct the laser 51 to adjust a phase current injection current Ip or a temperature of a gain region of the laser within an adjustment range to obtain an optical power spectrum of the laser.
  • the optical power spectrum indicates the correspondence between the current I of the Bragg reflection region of the laser and the optical power of the reflected light obtained by the PD detection; determining the optical power spectrum with the best axial symmetry from the obtained optical power spectrum as the target light Power spectrum; the temperature of the I or gain region corresponding to the determined target optical power spectrum, at least two parameters of the I DBR indicated by the peak point in the standard optical power spectrum as the adjustment laser
  • the processor 56 indicates that the laser is within the adjustment range, and adjusts the phase injection current I Phas6 or the temperature of the gain region of the laser to obtain the optical power spectrum of the laser, which specifically includes: the processor 56 indicates The laser adjusts the temperature of the Ip or the gain region according to a preset length within the adjustment range, and instructs the PD to measure the optical power of the reflected light to measure an optical power spectrum; the processor 56 for each measurement Obtaining an optical power spectrum, determining whether the measured optical power spectrum satisfies a first determining condition, a second determining condition, and a third determining condition; if the measured optical power spectrum satisfies a first determining condition, a second determining a condition and a third determining condition, the measured optical power spectrum is taken as the obtained optical power spectrum; if the measured optical power spectrum does not satisfy the first determining condition, and the obtained The optical power spectrum of the optical power spectrum is stopped, wherein the first determining condition is that the optical power of the reflected light indicated by the peak point
  • I DBR indicated by the second mode hop, / m is the I DBR indicated by the peak point, and the third threshold is based on the laser power, the range of values of I, the channel bandwidth of the MUX, and the isolation of the MUX. Degree determined.
  • the processor 56 determines the optical power spectrum with the best axis symmetry from the obtained optical power spectrum as the target optical power spectrum, and specifically includes: the processor 56 calculates a symmetric value hopping of each optical power spectrum.
  • the labeled I DBR , / m is the I DBR indicated by the peak point of the optical power spectrum ;
  • the first mode hopping point is the mode hop point along the I, decreasing direction from the peak point of the optical power spectrum;
  • the second mode hopping point is a mode hopping point that is closest to the peak point of the optical power spectrum along the I DBR increasing direction;
  • the processor 56 uses the optical power spectrum having the smallest symmetry value in each of the optical power spectra as The target optical power spectrum with the best symmetry.
  • the optical power of the reflected light indicated by the mode hopping point is greater than the optical power of the reflected light indicated by at least one adjacent point adjacent to the hopping point, and the difference between the optical power indicated by the adjacent point is greater than a fourth threshold; the fourth threshold is determined according to an optical power of the laser and an isolation of the MUX.
  • 0NU may further include a driving circuit connected to the processor 56 and the laser 51 for adjusting the phase of the laser 51 within an adjustment range according to the instruction of the processor 56.
  • the region injects current I Phas6 or the temperature of the gain region.
  • the functional modules of the ONU provided in this embodiment can be used to perform the wavelength alignment method of the laser shown in the first embodiment. The specific working principle is not described here. For details, refer to the description of the method embodiments.
  • FIG. 6 is a schematic structural diagram of an OLT according to a fourth embodiment of the present invention.
  • the OLT in the embodiment includes a laser 61, a first partial mirror 62, a second partial mirror 63, and a MUX 64.
  • the PD 65, 0LT also includes a processor 66.
  • the laser 61 is connected by the first partial mirror 62, the MUX 64 and the second partial mirror 63, the PD 65 is connected to the first partial mirror 62, and the processor 66 and the PD 65 and the The laser 61 is connected.
  • the connection between the processor 66 and the PD 65 and the laser 61 is electrically connected; the laser 61 passes through the connection between the first partial mirror 62, the MUX 64 and the second partial mirror 63, And the connection between the PD 65 and the first partial mirror 62 is optically connected.
  • the solid line is an electrical connection
  • the solid arrow line is an optical connection
  • the direction of the arrow is a light propagation direction.
  • the laser 61 is configured to emit an optical signal within an adjustment range according to an indication of the processor 66.
  • the PD 65 is configured to be detected by the laser 61, passes through the first partial mirror 62 and the MUX 64, reaches the second partial mirror 63, is reflected by the second partial mirror 63, and passes through the The reflected light of the MUX 64 reaching the first partial mirror 62 is obtained to obtain the optical power of the reflected light.
  • the processor 66 is configured to instruct the laser 61 to adjust a phase of the laser to inject a current I or a temperature of a gain region within an adjustment range to obtain an optical power spectrum of the laser, where the optical power spectrum indicates a laser Corresponding relationship between the current I of the Bragg reflection region and the optical power of the reflected light obtained by the PD detection; determining the optical power spectrum having the best axial symmetry from the obtained optical power spectrum as the target optical power spectrum; The Ip or the temperature of the gain region corresponding to the target optical power spectrum, And at least two parameters in the i DBR indicated by the peak point in the target optical power spectrum are used as parameters of the adjustment laser.
  • the processor 66 indicates that the laser is within the adjustment range, and adjusts the phase injection current I Phas6 or the temperature of the gain region of the laser to obtain the optical power spectrum of the laser, which specifically includes: the processor 66 indicates The laser adjusts the temperature of the Ip or the gain region according to a preset length within the adjustment range, and instructs the PD to measure the optical power of the reflected light to measure an optical power spectrum; the processor 66 for each measurement Obtaining an optical power spectrum, determining whether the measured optical power spectrum satisfies a first determining condition, a second determining condition, and a third determining condition; if the measured optical power spectrum satisfies a first determining condition, a second determining a condition and a third determining condition, the measured optical power spectrum is taken as the obtained optical power spectrum; if the measured optical power spectrum does not satisfy the first determining condition, and the obtained The optical power spectrum of the optical power spectrum is stopped, wherein the first determining condition is that the optical power of the reflected light indicated by
  • I DBR indicated by the second mode hop, / m is the I DBR indicated by the peak point, and the third threshold is based on the laser power, the range of values of I, the channel bandwidth of the MUX, and the isolation of the MUX. Degree determined.
  • the processor 66 determines the optical power spectrum with the best axis symmetry from the obtained optical power spectrum as the target optical power spectrum, and specifically includes: the processor 56 calculates the symmetry value of each optical power spectrum is the first Two-hop mode point
  • the labeled I DBR , / m is the I DBR indicated by the peak point of the optical power spectrum ;
  • the first mode hopping point is the mode hop point along the I, decreasing direction from the peak point of the optical power spectrum;
  • the second mode hopping point is a mode hopping point that is closest to the peak point of the optical power spectrum along the I DBR increasing direction;
  • the processor 56 uses the optical power spectrum having the smallest symmetry value in each of the optical power spectra as The target optical power spectrum with the best symmetry.
  • the optical power of the reflected light indicated by the mode hopping point is greater than the optical power of the reflected light indicated by at least one adjacent point adjacent to the hopping point, and the difference between the optical power indicated by the adjacent point is greater than a fourth threshold; the fourth threshold is determined according to an optical power of the laser and an isolation of the MUX.
  • a driving circuit is further included, and the driving circuit is connected to the processor 66 and the laser 61 for adjusting a phase region of the laser 61 within an adjustment range according to an instruction of the processor 66. Inject current I Phas6 or the temperature of the gain region.
  • the functional modules of the 0LT provided in this embodiment can be used to perform the wavelength alignment method of the laser shown in the first embodiment.
  • the specific working principle is not described here. For details, refer to the description of the method embodiments.
  • FIG. 7 is a flowchart of a method for wavelength alignment of a laser according to a fifth embodiment of the present invention.
  • the wavelength alignment method of the laser in this embodiment can be implemented by 0LT, and the laser in the ONU is wavelength-aligned, and the laser is connected to the optical line terminal OLT through the MUX, and the emitted light of the laser passes through The MUX is sent to the OLT, and the OLT detects that the transmitted light is obtained.
  • the method includes:
  • the optical power spectrum indicates the correspondence between the current I of the Bragg reflection region of the laser and the optical power of the transmitted light.
  • the laser is instructed to adjust the temperature of the Ip or the gain region according to a preset length, and the optical power spectrum is measured; and the measured optical power spectrum is determined for each measured optical power spectrum. Whether the first judgment condition, the second judgment condition, and the third judgment condition are satisfied; if the measured optical power spectrum satisfies the first judgment condition, the second judgment condition, and the third judgment condition, the measurement is saved Optical power spectrum; if the measured optical power spectrum does not satisfy the first determination condition, and the obtained optical power spectrum already exists, the measurement is stopped.
  • the first determining condition is that the optical power of the transmitted light indicated by the peak point of the optical power spectrum is greater than a first threshold, and the first threshold is based on the optical power of the laser and the light of the transmitted light in the optical transmission link. Determining the loss; the second determining condition is that an absolute value of the optical power difference of the transmitted light between the first mode hopping point and the second mode hopping point is less than a second threshold, and the second threshold is based on the optical power of the laser And determining, by the optical loss of the transmitted light in the optical transmission link and the isolation of the MUX; the third determining condition is that the symmetric value of the optical power spectrum + I is less than a third threshold, wherein / is.
  • the dish is the I DBR , I DBR2 3 ⁇ 4 as indicated by the first jump point
  • the I DBR indicated by the second mode hopping point, / m is the I DBR indicated by the peak point, and the third threshold is based on the optical power of the laser, the range of the I DBR , the channel bandwidth of the MUX, and the isolation of the MUX. definite.
  • Mode-hop point indicated i DBR 2 is a second mode hop point indicated i DBR
  • ⁇ is the optical power spectrum of the peak point marked I DBR
  • mode hopping of the first point along the I Save a mode hopping point that is closest to the peak point of the optical power spectrum in the small direction
  • the second hopping point is a mode hopping point that is closest to the peak point of the optical power spectrum along the I DBR increasing direction
  • the optical power spectrum with the smallest symmetry value is taken as the target optical power spectrum with the best symmetry.
  • the optical power of the reflected light indicated by the mode hopping point is greater than the optical power of the reflected light indicated by at least one adjacent point adjacent to the hopping point, and the optical power indicated by the adjacent point is The difference is greater than a fourth threshold; the fourth threshold is determined according to the optical power of the laser and the isolation of the MUX.
  • the Tuning Control field carries the parameters of the adjustment laser. In order for the 0NU to align the laser in the 0NU according to the parameters of the adjustment laser.
  • FIG. 8 is a schematic structural diagram of a wavelength aligning device for a laser according to a sixth embodiment of the present invention.
  • the wavelength aligning device of the laser in the embodiment is disposed in the 0LT to perform wavelength alignment on the laser in the ONU.
  • the wavelength aligning device of the laser includes: an obtaining module 81 determining module 82, a parameter module 83, and a transmitting module 84.
  • the obtaining module 81 is configured to, within the adjustment range, instruct the laser to adjust the phase region injection current Ip or the temperature of the gain region to obtain an optical power spectrum of the laser.
  • the optical power spectrum indicates a correspondence between the current I of the Bragg reflection region of the laser and the optical power of the transmitted light; and the transmitted light is the wavelength of the emitted light of the laser disposed in the optical network unit ONN.
  • the multiplexer MUX arrives at the optical line terminal OLT and is obtained by the OLT detection.
  • the obtaining module 81 is specifically configured to: in the adjustment range, instruct the laser to adjust the temperature of the Ip haS e or the gain region according to a preset length, and measure the optical power spectrum; for each measured optical power spectrum, Determining whether the measured optical power spectrum satisfies the first determining condition, the second determining condition, and the third determining condition; if the measured optical power spectrum satisfies the first determining condition, the second determining condition, and the And determining, by the third determining condition, the measured optical power spectrum; if the measured optical power spectrum does not satisfy the first determining condition, and the obtained optical power spectrum already exists, stopping the measurement;
  • the first determining condition is that the optical power of the transmitted light indicated by the peak point of the optical power spectrum is greater than a first threshold, and the first threshold is determined according to the optical power of the laser and the optical loss of the transmitted light in the optical transmission link.
  • the second determining condition is that the absolute value of the optical power difference of the transmitted light between the first mode hopping point and the second mode hopping point is less than a second threshold, and the second threshold is based on the optical power of the laser, MUX emitted light loss and isolation in the optical transmission link is determined; and the third determination condition is L marked by the jump point For the I DBR indicated by the peak point, the third threshold is determined according to the optical power of the laser, the range of values of I, the channel bandwidth of the MUX, and the isolation of the MUX.
  • the determining module 82 is connected to the obtaining module 81 for determining the optical power spectrum with the best axis symmetry from the obtained optical power spectrum as the target optical power spectrum.
  • the determining module may include: a calculating unit, configured to calculate each optical power spectrum
  • the I DBR indicated by the mode point, / m is the I DBR indicated by the peak point of the optical power spectrum ;
  • the first mode hopping point is the mode hop closest to the peak point of the optical power spectrum along the decreasing direction of the I DBR
  • a second mode hopping point is a mode hopping point which is closest to a peak point of the optical power spectrum along an increasing direction, and an optical power of the reflected light indicated by the hopping point is greater than at least one and the hopping mode
  • the optical power of the reflected light indicated by the adjacent adjacent point of the point, and the difference between the optical power indicated by the adjacent point is greater than a fourth threshold; the fourth threshold is based on the optical power of the laser and the The isolation of the MUX is determined.
  • the determining module may further include a determining unit configured to use, in each of the optical power spectra, an optical power spectrum having a minimum symmetry value as a target optical power spectrum that is optimal in symmetry.
  • a parameter module 83 connected to the determining module 82, for determining the determined target optical power spectrum
  • Ipha or the temperature of the gain zone, and the I indicated by the peak point in the target optical power spectrum, at least two: the number is used as a parameter for adjusting the laser.
  • the sending module 84 is connected to the parameter module 83 for transmitting parameters of the adjusting laser.
  • the sending module 84 is specifically configured to send a PL0AM message; a Reserve field in the PL0AM message or a Tuning Control field in the PL0AM message carries a parameter of the adjusting laser.
  • the functional modules of the wavelength aligning device of the laser provided in this embodiment can be used to perform the wavelength alignment method of the laser of the fifth embodiment. The specific working principle is not described here. For details, refer to the description of the method embodiment.
  • FIG. 9 is a schematic structural diagram of an OLT 90 according to a seventh embodiment of the present invention. As shown in FIG. 9, the 0LT 90 in this embodiment is used for wavelength alignment of a laser in the ONU, including: MUX 91. Receiver 92, transmitter 93 and processor 94.
  • the MUX 91 is coupled to a receiver 92, which is coupled to the receiver 92 and the transmitter 93, respectively.
  • the connection between the MUX 91 and the receiver 92 is an optical connection, and the connection between the processor 94 and the receiver 92 and the transmitter 93 is electrically connected.
  • the solid line is electrical. Connected, the solid arrow line is the light connection, and the direction of the arrow is the light propagation direction.
  • the receiver 92 is configured to detect, by the laser, the optical power of the transmitted light by the transmitted light of the MUX.
  • the processor 94 is configured to, within an adjustment range, instruct the laser to adjust a phase region injection current Ip or a temperature of a gain region to obtain an optical power spectrum of the laser, where the optical power spectrum indicates a Bragg reflection region of the laser a current I, a correspondence relationship with the optical power of the transmitted light obtained by the receiver; determining an optical power spectrum having the best axial symmetry from the obtained optical power spectrum as a target optical power spectrum; and correspondingly determining the determined target optical power spectrum
  • the Ip or the temperature of the gain region, and the I indicated by the peak point in the target optical power spectrum at least two parameters are used as parameters for adjusting the laser.
  • the transmitter 93 is configured to send parameters of the adjustment laser.
  • the processor 94 instructs the laser to adjust the phase region injection current I or the temperature of the gain region to obtain the optical power spectrum of the laser, which specifically includes: the processor 94 is within the adjustment range, indicating the The laser adjusts the temperature of the Ip or the gain region according to the preset length, and measures the optical power spectrum; the processor 94 determines, for each measured optical power spectrum, whether the measured optical power spectrum satisfies the first determining condition, a second determination condition and a third determination condition; if the measured optical power spectrum satisfies the first determination condition, the second determination condition, and the third determination condition, Preserving the measured optical power spectrum; if the measured optical power spectrum does not satisfy the first determining condition, and the obtained optical power spectrum already exists, stopping the measurement; wherein, the first determining condition is The optical power of the transmitted light indicated by the peak point of the optical power spectrum is greater than a first threshold, the first threshold being determined according to the optical power of the laser and the optical loss of the transmitted light in the optical transmission link
  • the I DBR indicated by the second mode hopping point, / m is the I DBR indicated by the peak point, and the third threshold is based on the optical power of the laser, the range of the I DBR , the channel bandwidth of the MUX, and the isolation of the MUX. definite.
  • the processor 94 determines the optical power spectrum with the best axis symmetry from the obtained optical power spectrum as the target optical power spectrum, and specifically includes: the processor 94 calculates a symmetrical value of each optical power spectrum + I / 1 is the I DBR indicated by the first hopping point, / 2 is the second hopping point
  • the labeled I DBR , / m is the I DBR indicated by the peak point of the optical power spectrum ;
  • the first mode hopping point is the mode hop point along the I, decreasing direction from the peak point of the optical power spectrum;
  • the second mode hopping point is a mode hopping point which is closest to the peak point of the optical power spectrum along the increasing direction of the I DBR , and the optical power of the reflected light indicated by the hopping point is greater than at least one adjacent to the hopping point
  • the optical power of the reflected light indicated by the adjacent point, and the difference between the optical power indicated by the adjacent point is greater than a fourth threshold; the fourth threshold is based on the optical power of the laser and the MUX
  • the isolation is determined.
  • the processor 94 uses the optical power spectrum having the smallest symmetry value as the target optical power spectrum with the best symmetry in each of the optical power spectra.
  • the transmitter 93 sends the parameters of the adjustment laser, which specifically includes: a transmitter
  • the PL0AM message is sent; the Reserve field in the PL0AM message or the Tuning Control field in the PL0AM message carries the parameter of the adjustment laser.
  • the function modules of the 0LT provided in this embodiment can be used to perform the wavelength alignment method of the laser of the fifth embodiment.
  • the specific working principle is not described here. For details, refer to the description of the method embodiments.
  • FIG. 10 is a schematic structural diagram of a P0N system according to an eighth embodiment of the present invention. As shown in FIG.
  • the P0N system in this embodiment may include: 0LT 90 and ONU 10, in this embodiment, 0LT 90 is 0NU.
  • the laser in 10 is wavelength aligned, and the 0LT 90 is connected to the ONU 10.
  • 0LT 90 and ONU 10 are specifically connected by MUX.
  • 0LT 90 used to indicate the phase region injection current of the 0NU 10 regulated laser within the adjustment range
  • the optical power spectrum of the laser is obtained, the optical power spectrum indicating the current 1 of the Bragg reflection region of the laser, and the optical power of the transmitted light; from the obtained optical power spectrum Determining the best optical power spectrum of the axis symmetry as the target optical power spectrum; determining the temperature of the Ip or gain region corresponding to the target optical power spectrum, and at least two I DBRs indicated by the peak points in the target optical power spectrum
  • the parameter is used as a parameter for adjusting the laser; the parameters of the adjustment laser are transmitted.
  • the 0LT 90 in this embodiment specifically performs the wavelength alignment method flow of the laser of the fifth embodiment, and the specific working principle thereof is not described again. For details, refer to the description of the method embodiment.
  • the 0LT90 connected to the 0LT 90, for adjusting the phase injection current I Phas6 or the temperature of the gain region of the laser according to the indication of the 0LT 90; and receiving the parameter of the adjustment laser sent by the 0LT 90, according to The parameters of the laser are adjusted for wavelength alignment. That is, the 0LT90 adjusts the parameters of the laser to the parameters of the received adjustment laser to achieve wavelength alignment.
  • the optical power spectrum of the laser is obtained, and then the optical power spectrum with the best axial symmetry is determined from the respective optical power spectra as the target light.
  • the power spectrum, the Ip or the temperature of the gain region corresponding to the determined target optical power spectrum, and the I indicated by the peak point in the target optical power spectrum, at least two parameters are used as parameters for adjusting the laser, thereby avoiding the use of laser parameters and outgoing light.
  • the mapping table of wavelengths determines the parameters of the laser and reduces the cost of the laser.

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Abstract

L'invention concerne un procédé et un dispositif d'alignement de longueur d'onde d'un laser (30, 51, 61), une ONU, un OLT (90) et un système de PON, le procédé comportant les étapes consistant à: régler, dans une plage de réglage, l'Iphase ou la température de la région de gain du laser (30, 51, 61), et effectuer une mesure pour obtenir les spectres de puissance de la lumière réfléchie ou transmise du laser (30, 51, 61); et déterminer un spectre de puissance présentant la meilleure symétrie axiale parmi les spectres de puissance pour servir de spectre de puissance visé, et utiliser au moins deux paramètres comme l'Iphase déterminé ou la température de la région de gain correspondant au spectre de puissance visé et l'IDBR marqué par un point de crête dans le spectre de puissance visé en tant que paramètres pour régler le laser (30, 51, 61), ce qui évite d'utiliser la relation de correspondance entre des paramètres du laser et les longueurs d'ondes de la lumière émise pour déterminer les paramètres servant à régler le laser, réduisant ainsi le coût du laser.
PCT/CN2014/081289 2014-06-30 2014-06-30 Procédé et dispositif d'alignement de longueur d'onde d'un laser, onu, olt et système de pon Ceased WO2016000183A1 (fr)

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CN201480012297.1A CN105409073B (zh) 2014-06-30 2014-06-30 激光器的波长对准方法和装置、onu、olt和pon系统
PCT/CN2014/081289 WO2016000183A1 (fr) 2014-06-30 2014-06-30 Procédé et dispositif d'alignement de longueur d'onde d'un laser, onu, olt et système de pon

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