WO2017128214A1 - 波长可调谐的光发射装置 - Google Patents

波长可调谐的光发射装置 Download PDF

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Publication number
WO2017128214A1
WO2017128214A1 PCT/CN2016/072585 CN2016072585W WO2017128214A1 WO 2017128214 A1 WO2017128214 A1 WO 2017128214A1 CN 2016072585 W CN2016072585 W CN 2016072585W WO 2017128214 A1 WO2017128214 A1 WO 2017128214A1
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Prior art keywords
wavelength
longitudinal mode
combiner
signal
cyclic
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Ceased
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PCT/CN2016/072585
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English (en)
French (fr)
Inventor
罗俊
冯志勇
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to PCT/CN2016/072585 priority Critical patent/WO2017128214A1/zh
Priority to CN201680077639.7A priority patent/CN108604932B/zh
Priority to ES16887101T priority patent/ES2901484T3/es
Priority to EP16887101.0A priority patent/EP3402093B1/en
Publication of WO2017128214A1 publication Critical patent/WO2017128214A1/zh
Priority to US16/047,013 priority patent/US10567085B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/506—Multiwavelength transmitters
    • 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
    • H01S5/02—Structural details or components not essential to laser action
    • H01S5/026—Monolithically integrated components, e.g. waveguides, monitoring photo-detectors, drivers
    • H01S5/0268—Integrated waveguide grating router, e.g. emission of a multi-wavelength laser array is combined by a "dragon router"
    • 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
    • H01S5/065—Mode locking; Mode suppression; Mode selection ; Self pulsating
    • 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
    • H01S5/065—Mode locking; Mode suppression; Mode selection ; Self pulsating
    • H01S5/0656—Seeding, i.e. an additional light input is provided for controlling the laser modes, for example by back-reflecting light from an external optical component
    • 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
    • H01S5/065—Mode locking; Mode suppression; Mode selection ; Self pulsating
    • H01S5/0657—Mode locking, i.e. generation of pulses at a frequency corresponding to a roundtrip in the cavity
    • 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
    • H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
    • H01S5/4025—Array arrangements, e.g. constituted by discrete laser diodes or laser bar
    • 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
    • H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
    • H01S5/4025—Array arrangements, e.g. constituted by discrete laser diodes or laser bar
    • H01S5/4087—Array arrangements, e.g. constituted by discrete laser diodes or laser bar emitting more than one wavelength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H04J14/0256—Optical medium access at the optical channel layer
    • 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
    • H04B10/50—Transmitters

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a wavelength tunable light emitting device.
  • WDM Wavelength Division Multiplexing
  • DFB Distributed Feedback Laser
  • WDM networks require multiple different wavelengths of signals, and each type of DFB laser emits a fixed wavelength, so WDM networks need Including optical transceiver modules that emit DFB lasers of different wavelengths, this will lead to an increase in the type of optical transceiver modules, thereby increasing the cost in the process of stocking, installation, operation and maintenance.
  • a wavelength tunable laser is used instead of a fixed wavelength DFB laser.
  • the principle of the wavelength tunable laser is based on the vernier effect of two sets of comb filtering to achieve wavelength tuning.
  • the main implementation of comb filtering is in a semiconductor laser.
  • DBR Etched Distributed Bragg Reflector
  • Embodiments of the present invention provide a wavelength tunable light emitting device capable of solving a WDM system based on a wavelength tunable laser, which is problematic in manufacturing cost.
  • an embodiment of the present invention provides a wavelength tunable light emitting device comprising a plurality of multi-longitudinal mode lasers, a circulating wavelength splitting combiner and a reflector;
  • An output end of the multi-longitudinal mode laser is coupled to an input of the circulating wavelength splitting combiner, and an output end of the circulating wavelength splitting combiner is coupled to an input of the reflector, the reflector The output end outputs a multiplexed signal;
  • the multi-longitudinal mode laser outputs a multi-longitudinal mode signal having a periodic repetition frequency interval, the period being ⁇ fmode;
  • the cyclic wavelength division combiner repeatedly filters the input multi-longitudinal mode signal through the input filter window to obtain a single frequency signal corresponding to the input filter window of the cyclic wavelength division combiner, the cycle
  • the wavelength division combiner combines the filtered single frequency signals at each input end and outputs the combined signal to the reflector through the output end of the cyclic wavelength division combiner, the filter window repeating period is ⁇ fband, Where ⁇ fmode is different from ⁇ fband, and ⁇ fmode and ⁇ fband are not in a whole multiple relationship;
  • the reflector reflects a multiplexed signal of a preset partial power in the input multiplexed signal back to the cyclic wavelength multiplexer, and the remaining signal of the input multiplexed signal except the preset partial power is from the The output of the reflector is output;
  • the cyclic wavelength multiplexer After receiving the multiplexed signal reflected by the reflector, the cyclic wavelength multiplexer separates the multiplexed signal reflected by the reflector into a single-frequency signal, and respectively determines a target input corresponding to each separated single-frequency signal. a filter window and a target input end of the cyclic wavelength division combiner corresponding to the target input filter window, and feedback each separated single frequency signal to the target input end through the target input end Longitudinal mode laser
  • the multi-longitudinal mode laser locks the wavelength of the cyclic wavelength splitter feedback single frequency signal, generates a signal having the same wavelength as that of the cyclic wavelength division combiner feedback single frequency signal, and outputs the signal.
  • the output of the multi-longitudinal mode laser is coupled to a 45 degree Faraday rotator, and an output of the Faraday rotator is coupled to the circulating wavelength splitter Input.
  • the reflector is a transflective 90 degree Faraday rotator.
  • the reflector comprises an optical splitter and a total reflection 90 degree Faraday rotator, the optical splitter
  • the multiplexed signal output by the circulating wavelength splitting combiner is split into two paths, wherein one of the paths is connected to the input end of the fully reflective 90 degree Faraday rotator, and the other is outputting the combined signal.
  • an etalon Etalon is disposed between the optical splitter and the total reflection 90 degree Faraday rotatory mirror.
  • the cyclic wavelength splitting combiner comprises a cyclic arrayed waveguide grating and an etalon Etalon, An input of the cyclic arrayed waveguide grating is coupled to an output of the Faraday rotator, the output of the cyclic arrayed waveguide grating is coupled to an input of the Etalon, and an output of the Etalon is coupled to an input of the reflector.
  • the cyclic wavelength division combiner is composed of N serially connected microring resonators
  • Each of the microring resonators corresponds to an input end of the circulating wavelength splitting combiner, and the output ends of the N microcircular resonators are outputted in series to form an output end of the circulating wavelength splitting combiner.
  • an embodiment of the present invention provides a wavelength tunable light emitting device comprising a plurality of multi-longitudinal mode lasers, an optical splitter disposed at an output end of each of the plurality of longitudinal mode lasers, and the cyclic wavelength division Combiner and reflector;
  • the optical splitter splits the signal output by the multi-longitudinal mode laser into two paths, one of which is connected to one input end of the circulating wavelength splitting combiner, and the other of which outputs the signal of the multi-longitudinal mode laser Outputting, the output end of the circulating wavelength division combiner is connected to the input end of the reflector;
  • the multi-longitudinal mode laser outputs a multi-longitudinal mode signal having a periodic repetition frequency interval, the period being ⁇ fmode;
  • the cyclic wavelength division combiner repeatedly filters the input multi-longitudinal mode signal through the input filter window to obtain a single frequency signal corresponding to the input filter window of the cyclic wavelength division combiner, the cycle
  • the wavelength division combiner combines the single frequency signals recorded and recorded at the respective input ends and outputs the multiplexed signals to the reflector through the output end of the cyclic wavelength division combiner, the filter window center wavelength repetition period Is ⁇ fband, where ⁇ fmode is different from ⁇ fband, and ⁇ fmode and ⁇ fband are not in a whole multiple relationship;
  • the reflector reflects the input multiplexed signal back to the cyclic wavelength division combiner
  • the cyclic wavelength multiplexer After receiving the multiplexed signal reflected by the reflector, the cyclic wavelength multiplexer separates the multiplexed signal reflected by the reflector into a single-frequency signal, and respectively determines a target input corresponding to each separated single-frequency signal. a filter window and a target input end of the cyclic wavelength division combiner corresponding to the target input filter window, and feedback each separated single frequency signal to the target input end through the target input end Longitudinal mode laser
  • the multi-longitudinal mode laser locks the wavelength of the cyclic wavelength splitter feedback single frequency signal, generates a signal having the same wavelength as that of the cyclic wavelength division combiner feedback single frequency signal, and outputs the signal.
  • a 45 degree Faraday rotator disposed between the multi-longitudinal mode laser and the optical splitter, the reflector is a transflective 90 Degree Faraday rotator.
  • the cyclic wavelength splitting combiner comprises a cyclic arrayed waveguide grating and an etalon Etalon, the cyclic array waveguide An input of the grating is coupled to an output of the Faraday rotator, the output of the cyclic arrayed waveguide grating is coupled to an input of the Etalon, and an output of the Etalon is coupled to an input of the reflector.
  • the cyclic wavelength division combiner is composed of N serially connected microring resonators, each of the a microring resonator corresponding to one input end of the circulating wavelength division combiner, N of the microring resonators
  • the output ends are outputted in series to form an output end of the circulating wavelength splitting combiner
  • an embodiment of the present invention provides a wavelength tunable method for a light emitting device, the light emitting device comprising a plurality of multi-longitudinal mode lasers, a circulating wavelength splitting combiner and a reflector, each of which An output end of the multi-longitudinal mode laser is coupled to an input of the circulating wavelength splitting combiner, and an output end of the circulating wavelength splitting combiner is coupled to an input of the reflector; the method comprising:
  • the multi-longitudinal mode laser outputs a multi-longitudinal mode signal having a periodic repetition frequency interval to the cyclic wavelength division combiner, the period being ⁇ fmode;
  • the cyclic wavelength division combiner repeatedly filters the input multi-longitudinal mode signal through the input filter window to obtain a single frequency signal corresponding to the input filter window of the cyclic wavelength division combiner, the filtering
  • the window repetition period is ⁇ fband, where ⁇ fmode is different from ⁇ fband, and ⁇ fmode and ⁇ fband are not in a whole multiple relationship;
  • the cyclic wavelength division combiner combines the filtered single frequency signals at each input end and transmits the combined signal to the reflector through the output end of the cyclic wavelength division combiner;
  • the reflector reflects a multiplexed signal of a preset partial power in the received multiplexed signal back to the circulating wavelength multiplexer, and the remaining signals of the received multiplexed signal except the preset partial power are Outputting the output of the reflector;
  • the cyclic wavelength division combiner separates the combined signal reflected by the reflector into a single frequency signal, and respectively determines a target input filter window corresponding to each separated single frequency signal and a filter window with the target input end Corresponding to the target input end of the cyclic wavelength division combiner;
  • the cyclic wavelength division combiner respectively feeds back the separated single frequency signals through the target input end to a multi-longitudinal mode laser connected to the target input end;
  • the multi-longitudinal mode laser locks the wavelength of the cyclic wavelength splitter feedback single frequency signal, and generates a signal with the same wavelength as the cyclic wavelength splitter feedback single frequency signal and outputs the same;
  • the wavelength of the output signal of the multi-longitudinal mode laser is adjusted in a direction close to the target wavelength, and the adjustment width is a/ ⁇ fmode-1+b.
  • an embodiment of the present invention provides a wavelength tunable method for a light emitting device, the light emitting device comprising a plurality of multi-longitudinal mode lasers, light disposed at an output end of each of the plurality of longitudinal mode lasers a splitter, the cyclic wavelength splitting combiner and a reflector; the optical splitter splits the signal output by the multi-longitudinal mode laser into two paths, one of which is combined with one of the circulating wavelength splitting combiners The input is connected, the other is outputting the signal output by the multi-longitudinal mode laser, and the output end of the cyclic wavelength splitter is connected to the input of the reflector; the method includes:
  • the multi-longitudinal mode laser outputs a multi-longitudinal mode signal having a periodic repetition frequency interval to the cyclic wavelength division combiner, the period being ⁇ fmode;
  • the cyclic wavelength division combiner performs periodic repetition filtering on the multi-longitudinal mode signal input through the optical splitter through the input filter window, and obtains a corresponding filter window corresponding to the input end of the cyclic wavelength division combiner a single-frequency signal, the filter window repetition period is ⁇ fband, where ⁇ fmode is different from ⁇ fband, and ⁇ fmode and ⁇ fband are not mutually integral relationship;
  • the cyclic wavelength division combiner combines the filtered single frequency signals at each input end and transmits the combined signal to the reflector through the output end of the cyclic wavelength division combiner;
  • the reflector reflects the input multiplexed signal back to the cyclic wavelength division combiner
  • the cyclic wavelength division combiner separates the combined signal reflected by the reflector into a single frequency signal, and respectively determines a target input filter window corresponding to each separated single frequency signal and a filter window with the target input end Corresponding to the target input end of the cyclic wavelength division combiner;
  • the cyclic wavelength division combiner respectively feeds back the separated single frequency signals through the target input end to a multi-longitudinal mode laser connected to the target input end;
  • the multi-longitudinal mode laser locks the wavelength of the cyclic wavelength splitter feedback single frequency signal, And generating a signal having the same wavelength as that of the cyclic wavelength division combiner feedback single frequency signal and outputting;
  • the wavelength of the output signal of the multi-longitudinal mode laser is adjusted in a direction close to the target wavelength, and the adjustment width is a/ ⁇ fmode-1+b.
  • Embodiments of the present invention provide a wavelength tunable light emitting device.
  • a plurality of multi-longitudinal mode lasers, a circulating wavelength splitting combiner and a reflector constitute a light emitting device, and the first cycle wavelength splitting combiner passes through
  • the multi-longitudinal mode signal outputted by the multi-longitudinal mode laser is filtered to obtain a combined signal of the wavelength required by the light emitting device, and then the reflector reflects the combined signal of the partial power back to the circulating wavelength splitting combiner, and the circulating wavelength splitting combiner will
  • the multiplexed signal is separated and fed back to the multi-longitudinal mode laser, so that the multi-longitudinal mode laser determines the wavelength of the output signal according to the wavelength of the feedback signal, so that the multi-longitudinal mode laser continuously outputs the signal of the determined wavelength, that is, the light emitting device can continuously output the required Wavelength multiplexed signal; setting the filtering window of the input end
  • the single-frequency signal corresponding to the filtering window of the input end is obtained by passing through the filtering window of the combined wavelength splitting filter.
  • the other signal outputted by the multi-longitudinal mode laser corresponds to another filtering window of the cyclic wavelength division combiner, that is, the cyclic wavelength division combiner filters the input multi-longitudinal mode signal to obtain a single corresponding to the input filter window at this time.
  • the frequency signal since the center wavelengths of the input and output filter windows are different, the wavelengths of the single-frequency signals obtained by the two filterings are not the same, that is, the tuning of the output signal wavelength is achieved.
  • the multi-longitudinal mode laser has a simple structure, and the manufacturing process does not require elaborate manufacturing processes and complicated algorithms, which simplifies the laser design and fabrication process and reduces the cost of the light emitting device.
  • FIG. 1 is a schematic structural diagram of a wavelength tunable light emitting device according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of wavelength tuning of a wavelength tunable light emitting device according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a wavelength tunable light emitting device according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a wavelength tunable light emitting device according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a wavelength tunable light emitting device according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a wavelength tunable light emitting device according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a wavelength tunable light emitting device according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a wavelength tunable light emitting device according to another embodiment of the present invention.
  • FIG. 9 is a flowchart of a wavelength tunable method according to still another embodiment of the present invention.
  • FIG. 10 is a flowchart of a wavelength tunable method according to still another embodiment of the present invention.
  • An embodiment of the present invention provides a wavelength tunable light emitting device, as shown in FIG. 1, comprising a plurality of multi-longitudinal mode lasers 1, a cyclic wavelength splitting combiner 2 and a reflector 3; and the multi-longitudinal mode laser 1
  • the output end is connected to an input end of the circulating wavelength splitting combiner 2, the output end of the circulating wavelength splitting combiner 2 is connected to the input end of the reflector 3, and the output end of the reflector 3 Outputting a multiplexed signal;
  • the multi-longitudinal mode laser 1 outputs a plurality of longitudinal mode signals having periodic repetition frequency intervals, The cycle is ⁇ fmode;
  • the cyclic wavelength division combiner 2 performs periodic repetition filtering on the input multi-longitudinal mode signal through the input filter window, and obtains a corresponding filter window corresponding to the input end of the cyclic wavelength division combiner 2 a single-frequency signal, the cyclic wavelength division combiner 2 combines the filtered single-
  • the multi-longitudinal mode laser 1 Locking the wavelength of the cyclic-wavelength splitter 2 to feed back the single-frequency signal, and generating a signal having the same wavelength as that of the cyclic-wavelength splitter 2 to feed back the single-frequency signal, and outputting the signal.
  • the implementation of the multi-longitudinal mode laser 1 may be a semiconductor laser based on a Fabry Perot cavity or a ring resonator.
  • the n multi-longitudinal mode lasers 1 are respectively connected to the n input ports of the cyclic wavelength division combiner 2.
  • the reflector 3 can be a 90 degree transflective Faraday Rotation Mirror (FRM).
  • FRM rotates the polarization state of the input signal of the FRM by 90°, and reflects the combined signal of the partial power to make it along the original.
  • the paths are fed back to each of the plurality of longitudinal mode lasers 1, respectively, and the remaining multiplexed signals are transmitted.
  • the multi-longitudinal mode laser starts to output a multi-longitudinal mode signal
  • the cyclic wavelength division combiner 2 filters the multi-longitudinal mode signal outputted by the multi-longitudinal mode laser 1 into a single-frequency signal, and then combines the output into one
  • the fiber port, the reflector 3 is connected to the output port of the circulating wavelength division combiner 2, and the part of the power multiplexed signal is divided into the single frequency signal by the cyclic wavelength division combiner 2, and then fed back to each of the multiple longitudinal mode lasers.
  • the multi-longitudinal mode laser 1 locks the wavelength of the single-frequency signal fed back by the cyclic wavelength division combiner 2, and generates a single-frequency signal having the same wavelength as the locked single-frequency signal in the subsequent process. And outputted to the input end of the cyclic wavelength division combiner 2, whereby the multi-longitudinal mode laser 1, the filtering window of the cyclic wavelength division combiner 2, and the reflector 3 constitute a self-injection feedback device, which can realize more
  • the longitudinal mode laser 1 is locked in a single longitudinal mode output mode, thereby ensuring that the multi-longitudinal mode laser 1 outputs a single-frequency signal of one wavelength at a certain time.
  • the wavelength of one and only one laser signal is matched to the center wavelength of the filtering window of the cyclic wavelength division combiner, so that by self-injection feedback locking, only the wavelength-matched longitudinal mode resonance can be allowed, while the remaining wavelengths do not match the longitudinal mode.
  • the output of the multi-longitudinal mode laser is locked in the single-frequency output mode, and the output single-frequency signal wavelength is aligned with the center wavelength of the filter window of the cyclic wavelength division combiner 2.
  • the window of the cyclic wavelength division combiner 2 is aligned with the International Telecommunication Union standardization grid (ITU-T grid)
  • the wavelength of the single-frequency signal that is filtered and locked by the cyclic wavelength division combiner 2 is correspondingly
  • the ITU-grid is aligned, so the light-emitting device of the embodiment of the present invention does not require additional wavelength current map modulation, which reduces cost and complexity of use.
  • the frequency shift is equal to the difference between ⁇ fmode and ⁇ fband, and the multi-longitudinal mode can be used to tune the wavelength locked by the laser 1 to the next of the cyclic wavelength splitter 2
  • the periodic filtering window for example, as shown in FIG. 2, the circulating wavelength division combiner 2 has a total of four input ports, and the interval between the input ports is fch, and the multi-longitudinal mode corresponding to the input port 2 outputs the wavelength of the laser 1 to ⁇ mode1.
  • the signal of the ⁇ mode1 wavelength in the multi-longitudinal mode signal in the current state is opposite to the center wavelength ⁇ 1 of the filtering window of the input port 2 in the cyclic wavelength division combiner 2 Matching, the multi-longitudinal mode passes the laser 1 through self-injection feedback to lock the signal with the wavelength ⁇ 1.
  • the multi-longitudinal mode is adjusted to move the laser 1 to the high frequency direction.
  • the longitudinal mode signal of wavelength ⁇ mode(1+m) will be frequency shifted to the input port 2 of the circulating wavelength splitter 2
  • the multi-longitudinal mode passes the laser 1 through self-injection feedback to lock the signal with a wavelength of ⁇ (1+m), thereby realizing wavelength tuning.
  • the plurality of multi-longitudinal mode lasers 1 are identical, which can further simplify the manufacturing process of the light emitting device and reduce the cost.
  • the filter window of the input end of the cyclic wavelength division combiner 2 is repeated, and the multi-longitudinal mode laser 1 outputs the frequency interval period of the multi-longitudinal mode signal and the input filter filter window repetition period of the cyclic wavelength division combiner 2 Different and not integral with each other, when the multi-longitudinal mode laser 1 outputs multiple longitudinal mode signals, only one signal can pass through the filtering window of the cyclic wavelength division combiner 2 at the same time, and the filtering window with the input end is obtained.
  • Corresponding single-frequency signal when the wavelength of the tuning signal is needed, only the spectrum of the output signal of the multi-longitudinal mode laser 1 needs to be translated, so that the other signal outputted by the multi-longitudinal mode laser 1 can correspond to the other of the cyclic wavelength division combiner 2
  • a filtering window that is, the cyclic wavelength division combiner 2 filters the input multi-longitudinal mode signal to obtain a single-frequency signal corresponding to the filtering window of the input end at this time, because the center wavelengths of the filtering windows of the input end are different before and after, Then, the wavelengths of the single-frequency signals obtained by the two filterings before and after are not the same, that is, the tuning of the wavelength of the output signal is realized.
  • the wavelength division combiner 2 has a simple structure, and the manufacturing process does not require a fine manufacturing process and a complicated algorithm, which simplifies the laser design and fabrication process and reduces the cost of the light emitting device.
  • the embodiment of the present invention is based on a semiconductor multi-longitudinal mode laser having a simple Fabry Perot cavity or a ring resonator, and is connected to a cyclic wavelength.
  • the lasers at each port of the combiner 2 are identical in design, which simplifies laser design and fabrication, reducing overall system cost.
  • the embodiment of the invention is based on self-injection feedback, the multi-longitudinal mode laser is locked to the single-frequency signal by self-injection feedback and output, and the single-frequency signal wavelength is automatically aligned with the filtering window of the cyclic wavelength division combiner 2 without additional debugging This reduces the test cost of the light emitting device.
  • the output end of the multi-longitudinal mode laser 1 is connected to a 45-degree Faraday rotator 4, and the output end of the Faraday rotator 4 is connected to a cyclic wavelength splitting wave.
  • the input end of the device 2, whereby the 45 degree Faraday rotator 4, can restore the polarization state of the signal fed back by the cyclic wavelength division combiner 2 to the state when the signal is output from the multi-longitudinal mode laser 1.
  • the reflector 3 includes an optical splitter 5, and the optical splitter 5 divides the combined signal output by the circulating wavelength splitting combiner 2 There are two paths, one of which is connected to the input end of the fully reflective 90 degree Faraday rotator 6, the reflector is a total reflection Faraday rotator, and the other is to output the multiplexed signal.
  • the multiplexed signal output from the circulating wavelength division multiplexer 2 is split into two paths by the optical splitter 5, and one path connecting the input end of the total reflection 90-degree Faraday rotator 6 is used for signal feedback, and the other is to be combined.
  • the wave signal output plays the same role as the transflective 90 degree Faraday rotator.
  • an etalon Etalon 8 is disposed between the optical splitter and the total reflection 90 degree Faraday refracting mirror.
  • the cyclic wavelength division combiner 2 includes a cyclic arrayed waveguide grating 7 and an etalon Etalon8, and an input end of the cyclic arrayed waveguide grating 7 is connected to the output of the Faraday rotator 4.
  • the output end of the circulating array waveguide grating 7 is connected to the input end of the Etalon 8
  • the output end of the Etalon 8 is connected to the output end of the reflector 3
  • the Etalon 8 is aligned with the filtering window of the cyclic arrayed waveguide grating 7 to realize self-injection feedback of the multi-longitudinal mode laser as described above. Control of wavelength locking accuracy.
  • the cyclic wavelength division combiner 2 is composed of a Cyclic AWG with n input ports and an Etalon 8 connected at its output port.
  • the cyclic arrayed waveguide grating 7 can be a common Gaussian type or a flat top type, and each input port is a periodic filtering window.
  • the Etalon 8 is aligned with the filter window of the cyclic arrayed waveguide grating 7 to achieve control of the self-injection feedback wavelength locking accuracy of the multi-longitudinal mode laser as described above.
  • Each of the microring resonators 9 corresponds to one input port, and both have periodic filtering windows.
  • the free spectral range FSR of the filtering window is the same, and the FSR corresponds to the ⁇ fband of the cyclic wavelength division combiner 2.
  • the filter window resonance peaks of the respective microring resonators 9 are equally spaced, and the interval between the filter windows of the adjacent two microring resonators is the channel interval ⁇ fch of the cyclic wavelength division combiner 2.
  • the filtering bandwidth of the microring resonator realizes the control of the self-injection feedback wavelength locking precision of the multi-longitudinal mode laser as described above.
  • FIG. 8 Another embodiment of the present invention provides a wavelength tunable light emitting device, as shown in FIG. 8, comprising a plurality of multi-longitudinal mode lasers 1, an optical splitter 5 disposed at an output end of the multi-longitudinal mode laser 1, and the cycle a wavelength splitting combiner 2 and a reflector 3; an output of each of the plurality of longitudinal mode lasers 1 is provided with the optical splitter 5, and the optical splitter 5 outputs a signal output by the multi-longitudinal mode laser 1 Divided into two paths, one of which is connected to one input end of the circulating wavelength splitting combiner 2, the output end of the circulating wavelength splitting combiner 2 is connected to the input end of the reflector 3, and the other is connected a signal output outputted by the multi-longitudinal mode laser 1; the multi-longitudinal mode laser 1 outputs a multi-longitudinal mode signal having a periodic repetition frequency interval, the period being ⁇ fmode; and the cyclic wavelength division multiplexer 2 is
  • the output of the combiner 2 outputs a multiplexed signal to the reflector, the filter window repeating period being ⁇ fband, wherein ⁇ fmode is different from ⁇ fband, and ⁇ fmode and ⁇ fband are not mutually integral relationship; the reflector 3 Reflecting the input multiplexed signal back to the cyclic wavelength division multiplexer 2; after receiving the multiplexed signal reflected by the reflector 3, the cyclic wavelength multiplexer 2 receives the multiplexed signal reflected by the reflector Separating into a single frequency signal, respectively determining a target input filter window corresponding to each separated single frequency signal and a target input end of the cyclic wavelength division combiner 2 corresponding to the target input filter window, respectively separating
  • the rear single frequency signal is fed back to the multi-longitudinal mode laser 1 connected to the target input end through the target input end; the multi-longitudinal mode laser 1 locks the wavelength of the single-frequency signal fed back by the cyclic wavelength division
  • a 45-degree Faraday rotator is disposed between the multi-longitudinal mode laser 1 and the optical splitter, and the reflector 3 is a transflective 90-degree Faraday rotator.
  • the cyclic wavelength division combiner includes a cyclic arrayed waveguide grating and an etalon Etalon, and an input end of the cyclic arrayed waveguide grating is connected to an output end of the Faraday rotator, A loop array waveguide grating output is coupled to the input of the Etalon, and an output of the Etalon is coupled to the input of the reflector.
  • the medium-circulating wavelength division multiplexer 2 of the embodiment of the present invention can also be implemented by the implementations of FIG. 6 and FIG. 7, and details are not described herein again.
  • the plurality of multi-longitudinal mode lasers 1 are identical, which can further simplify the manufacturing process of the light emitting device and reduce the cost.
  • the filter window of the input end of the cyclic wavelength division combiner 2 is repeated, and the multi-longitudinal mode laser 1 outputs the frequency interval period of the multi-longitudinal mode signal and the input filter filter window repetition period of the cyclic wavelength division combiner 2 Different and not integral with each other, when the multi-longitudinal mode laser 1 outputs multiple longitudinal mode signals, only one signal can pass through the filtering window of the cyclic wavelength division combiner 2 at the same time, and the filtering window with the input end is obtained.
  • Corresponding single-frequency signal when the wavelength of the tuning signal is needed, only the spectrum of the output signal of the multi-longitudinal mode laser 1 needs to be translated, so that the other signal outputted by the multi-longitudinal mode laser 1 can correspond to the other of the cyclic wavelength division combiner 2
  • a filtering window that is, the cyclic wavelength division combiner 2 filters the input multi-longitudinal mode signal to obtain a single-frequency signal corresponding to the filtering window of the input end at this time, because the center wavelengths of the filtering windows of the input end are different before and after, Then, the wavelengths of the single-frequency signals obtained by the two filters before and after are not the same, that is, the tuning of the output signal wavelength is achieved.
  • the multi-longitudinal mode laser 1 and the cyclic wavelength division combiner 2 have a simple structure, and the manufacturing process does not require a fine manufacturing process and a complicated algorithm, which simplifies the laser design and fabrication process and reduces the cost of the light emitting device.
  • Yet another embodiment of the present invention provides a wavelength tunable method for a light emitting device, the light emitting device comprising a plurality of multi-longitudinal mode lasers, a circulating wavelength splitting combiner and a reflector, each of the plurality of longitudinals An output end of the mode laser is coupled to an input end of the circulating wavelength splitting combiner, and an output end of the circulating wavelength splitting combiner is coupled to an input end of the reflector; as shown in FIG. include:
  • a multi-longitudinal mode laser outputs a multi-longitudinal mode signal having a periodic repetition frequency interval to a cyclic wavelength division combiner.
  • the period is ⁇ fmode, that is, the period of the frequency interval between the plurality of longitudinal mode signals is ⁇ fmode.
  • the cyclic wavelength division combiner repeatedly filters the input multi-longitudinal mode signal through the input filter window to obtain a single-frequency signal corresponding to the input filter window of the cyclic wavelength division combiner.
  • the repetition period of the filtering window is ⁇ fband, that is, the repetition period of the center wavelength of the filtering window is ⁇ fband, ⁇ fmode is different from ⁇ fband, and ⁇ fmode and ⁇ fband are not mutually integral.
  • the cyclic wavelength division combiner combines the filtered single frequency signals of each input end and sends the combined signal to the reflector through the output end of the cyclic wavelength division combiner.
  • the reflector reflects the multiplexed signal of the preset partial power in the received multiplexed signal back to the circulating wavelength multiplexer, and the remaining signal of the received multiplexed signal except the preset partial power is output from the output end of the reflector. .
  • the cyclic wavelength division combiner separates the combined signal reflected by the reflector into a single frequency signal, and respectively determines a target input filter window corresponding to each separated single frequency signal and a cyclic wavelength corresponding to the target input filter window.
  • the target input of the splitter is the target input of the splitter.
  • the cyclic wavelength division combiner respectively feeds back the separated single frequency signals through the target input end to the multi-longitudinal mode laser connected to the target input end.
  • the multi-longitudinal mode laser locks the cyclic wavelength division combiner to feed back the wavelength of the single frequency signal, and generates and outputs a signal having the same wavelength as that of the cyclic wavelength division combiner feedback single frequency signal.
  • the light emitting device calculates a difference a between the wavelength of the current output signal of the multi-longitudinal mode laser and the target wavelength, and a difference b between ⁇ fmode and ⁇ fband;
  • the light emitting device adjusts a wavelength of the output signal of the plurality of longitudinal mode lasers toward a target wavelength, and the adjustment amplitude is a/ ⁇ fmode-1+b.
  • wavelength tunable method in the embodiment of the present invention is applicable to the apparatus shown in FIGS. 1 to 7.
  • the filtering window of the input end of the circulating wavelength division multiplexer 2 is repeated, and the frequency interval period of the output of the multi-longitudinal mode laser of the multi-longitudinal mode laser is different from the repetition period of the filtering window of the input end of the cyclic wavelength division multiplexer and is not
  • the multi-longitudinal mode laser outputs multi-longitudinal mode signals, only one signal can pass from the filtering window of the circulating wavelength division combiner at the same time, and the single-frequency signal corresponding to the filtering window of the input end is obtained.
  • the wavelength tuning of the transmitting device makes the process simple, does not require elaborate manufacturing processes and complicated algorithms, and reduces the cost of the light emitting device.
  • step 101 is specifically:
  • a multi-longitudinal mode laser outputs a multi-longitudinal mode signal to a cyclic wavelength division combiner through a Faraday rotator.
  • Yet another embodiment of the present invention provides a wavelength tunable method for a light emitting device, the light emitting device comprising a plurality of multi-longitudinal mode lasers disposed at each of the plurality of longitudinal mode laser outputs An optical splitter, the cyclic wavelength splitter and a reflector; the optical splitter splits the signal output by the multi-longitudinal laser into two paths, one of which is combined with the circulating wavelength splitter One input is connected, the other is outputting the signal output by the multi-longitudinal mode laser, and the output end of the cyclic wavelength division combiner is connected to the input end of the reflector; as shown in FIG. 10, the method include:
  • the multi-longitudinal mode laser outputs a multi-longitudinal mode signal having a periodic repetition frequency interval to the cyclic wavelength division combiner.
  • the period is ⁇ fmode, that is, the period of the frequency interval between the plurality of longitudinal mode signals is ⁇ fmode.
  • the cyclic wavelength division combiner performs periodic repetition filtering on the multiple longitudinal mode signals input through the optical splitter through the input filter window, and obtains a single frequency signal corresponding to the input filter window of the cyclic wavelength division combiner.
  • the repetition period of the filtering window is ⁇ fband, that is, the repetition period of the center wavelength of the filtering window is ⁇ fband, ⁇ fmode is different from ⁇ fband, and ⁇ fmode and ⁇ fband are not mutually integral.
  • the cyclic wavelength division combiner combines the filtered single frequency signals of each input end and sends the combined signal to the reflector through the output end of the cyclic wavelength division combiner.
  • the reflector reflects the input multiplexed signal back to the cyclic wavelength division combiner.
  • the circulating wavelength splitting combiner separates the combined signal reflected by the reflector into a single frequency signal, and respectively determines a target input filtering window corresponding to each separated single frequency signal and a circulating wavelength corresponding to the filtering window of the target input end.
  • the target input of the splitter is the target input of the splitter.
  • the cyclic wavelength division combiner respectively feeds back the separated single frequency signals through the target input end to the multi-longitudinal mode laser connected to the target input end.
  • the multi-longitudinal mode laser locks the cyclic wavelength division combiner to feed back the wavelength of the single frequency signal, and generates a signal with the same wavelength as that of the cyclic wavelength division combiner feedback single frequency signal and outputs the same.
  • the light emitting device calculates a difference a between the wavelength of the current output signal of the multi-longitudinal mode laser and the target wavelength, and a difference b between ⁇ fmode and ⁇ fband;
  • the light emitting device adjusts a wavelength of the output signal of the plurality of longitudinal mode lasers toward a target wavelength, and the adjustment amplitude is a/ ⁇ fmode-1+b.
  • the filtering window of the input end of the circulating wavelength division multiplexer 2 is repeated, and the frequency interval period of the output of the multi-longitudinal mode laser of the multi-longitudinal mode laser is different from the repetition period of the filtering window of the input end of the cyclic wavelength division multiplexer and is not
  • the multi-longitudinal mode laser outputs multi-longitudinal mode signals, only one signal can pass from the filtering window of the circulating wavelength division combiner at the same time, and the single-frequency signal corresponding to the filtering window of the input end is obtained.
  • the wavelength tuning of the transmitting device makes the process simple, does not require elaborate manufacturing processes and complicated algorithms, and reduces the cost of the light emitting device.
  • wavelength tunable method in the embodiment of the present invention is applicable to the device corresponding to the embodiment shown in FIG.

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Abstract

一种波长可调谐的光发射装置，涉及通信技术领域，包括多个多纵模激光器（1）、循环波长分合波器（2）和反射器（3）。多纵模激光器输出具有周期重复频率间隔的多纵模信号，周期为Δfmode；循环波长分合波器对从多纵模激光器输入的多纵模信号进行周期重复滤波得到单频信号，滤波窗口重复周期为Δfband，其中，Δfmode与Δfband不同，且Δfmode与Δfband不互为整倍数关系，然后将多个单频信号合波并输出；反射器将合波信号反射，反射合波信号再次通过循环波长分合波器分别返回多纵模激光器模块中；多纵模激光器锁定反馈的单频信号的波长，生成与锁定的波长相同的单频信号并输出。这种光发射装置能够解决基于波长可调谐的激光器的WDM系统，成本过高的问题。

Description

波长可调谐的光发射装置 技术领域
本发明涉及通信技术领域，尤其涉及一种波长可调谐的光发射装置。
背景技术
为提高网络传输容量，波分复用(Wavelength Division Multiplexing，WDM)技术进入城域接入以及数据中心的需求日益迫切，采用WDM技术可以成倍的提升单光纤的传输容量，并且引入波长维度进行网络管理和规划。WDM网络通常使用分布式反馈激光器(Distributed Feedback Laser，DFB)来发射波长信号，但是，WDM网络中需要多种不同波长的信号，而每一类型DFB激光器发射的波长是固定的，因此WDM网络需要包括发射不同波长DFB激光器的光收发模块，这样就会导致光收发模块类型的增加，进而提高了在备货、安装、运转与维护过程中成本。现有技术中采用波长可调谐的激光器来替代固定波长的DFB激光器，波长可调谐激光器的原理是基于两组梳状滤波的游标效应来实现波长调谐，梳状滤波的主要实现方案是在半导体激光器刻蚀分布式反馈布拉格光栅(Distributed Bragg Reflector，DBR)。采用波长可调谐的激光器不仅可以减少光模块的种类，还可以给网络管理和规划带来额外的灵活度。
现有技术中至少存在如下问题：DBR光栅的制作需要精细的制造工艺，这导致其制造成本高于普通的DFB激光器，并且波长可调谐的激光器实现波长的调谐需要复杂的多电极控制电流和控制算法，这增加了制造的复杂度率，进而提高了DBR可调谐激光器的成本。所以，基于波长可调谐的激光器的WDM系统并不能从根本上降低成本。
发明内容
本发明的实施例提供一种波长可调谐的光发射装置，能够解决基于波长可调谐的激光器的WDM系统，制造成本过高的问题。
为达到上述目的，本发明的实施例采用如下技术方案：
第一方面，本发明的实施例提供一种波长可调谐的光发射装置，包括多个多纵模激光器、循环波长分合波器和反射器；
所述多纵模激光器的输出端与所述循环波长分合波器的一个输入端连接，所述循环波长分合波器的输出端与所述反射器的输入端连接，所述反射器的输出端输出合波信号；
所述多纵模激光器输出具有周期重复频率间隔的多纵模信号，所述周期为Δfmode；
所述循环波长分合波器对输入的多纵模信号通过输入端滤波窗口进行周期重复滤波，得出与所述循环波长分合波器的输入端滤波窗口对应的单频信号，所述循环波长分合波器将各输入端滤波后的单频信号合波并通过所述循环波长分合波器的输出端将合波信号输出至所述反射器，所述滤波窗口重复周期为Δfband，其中，Δfmode与Δfband不同，且Δfmode与Δfband不互为整倍数关系；
所述反射器将输入合波信号中预设部分功率的合波信号反射回所述循环波长分合波器，所述输入合波信号中除所述预设部分功率外的剩余信号从所述反射器的输出端输出；
所述循环波长分合波器接收所述反射器反射的合波信号后，将所述反射器反射的合波信号分离为单频信号，分别确定与各分离后单频信号对应的目标输入端滤波窗口以及与所述目标输入端滤波窗口对应的所述循环波长分合波器的目标输入端，将各分离后单频信号通过所述目标输入端反馈至与所述目标输入端连接的多纵模激光器；
所述多纵模激光器锁定所述循环波长分合波器反馈单频信号的波长，生成与所述循环波长分合波器反馈单频信号的波长相同的信号并输出。
结合第一方面，在第一方面的第一种实施方式中，所述多纵模激光器的输出端连接45度法拉第旋光器，所述法拉第旋光器的输出端连接所述循环波长分合波器的输入端。
结合第一方面或第一方面的第一种实施方式，在第一方面的第二种实施方式中，所述反射器为半透半反90度法拉第旋光镜。
结合第一方面或第一方面的第一种实施方式，在第一方面的第三种实施方式中，反射器包括光分路器和全反射90度法拉第旋光镜，所述光分路器将所述循环波长分合波器输出的合波信号分为两路，其中，一路连接全反射90度法拉第旋光镜的输入端，另一路将所述合波信号输出。
结合第一方面的第三种实施方式，在第一方面的第四种实施方式中，在所述光分路器和所述全反射90度法拉第旋光镜之间设置标准具Etalon。
结合第一方面或第一方面的第一至第三任一种实施方式，在第一方面的第五种实施方式中，所述循环波长分合波器包括循环阵列波导光栅和标准具Etalon，所述循环阵列波导光栅的输入端连接所述法拉第旋光器的输出端，所述循环阵列波导光栅输出端连接所述Etalon的输入端，所述Etalon的输出端连接所述反射器的输入端。
结合第一方面或第一方面的第一至第三任一种实施方式，在第一方面的第六种实施方式中，所述循环波长分合波器由N个串联的微环谐振腔构成，每个所述微环谐振腔对应所述循环波长分合波器的一个输入端，N个所述微环谐振腔的输出端串联一并输出，构成循环波长分合波器的输出端，每个所述微环谐振腔具有重复周期为Δfband的滤波窗口，相邻两个所述微环谐振腔的滤波窗口之间相互间隔Δfch，其中，Δfband＝N*Δfch，N等于所述循环波长分合波器输入端个数。
第二方面，本发明的实施例提供一种波长可调谐的光发射装置，包括多个多纵模激光器、设置在每个所述多纵模激光器输出端的光分路器、所述循环波长分合波器和反射器；
所述光分路器将所述多纵模激光器输出的信号分为两路，其中一路与所述循环波长分合波器的一个输入端连接，另一路将所述多纵模激光器输出的信号输出，所述循环波长分合波器的输出端与所述反射器的输入端连接；
所述多纵模激光器输出具有周期重复频率间隔的多纵模信号，所述周期为Δfmode；
所述循环波长分合波器对输入的多纵模信号通过输入端滤波窗口进行周期重复滤波，得出与所述循环波长分合波器的输入端滤波窗口对应的单频信号，所述循环波长分合波器将各输入端录播后的单频信号合波并通过所述循环波长分合波器的输出端将合波信号输出至所述反射器，所述滤波窗口中心波长重复周期为Δfband，其中，Δfmode与Δfband不同，且Δfmode与Δfband不互为整倍数关系；
所述反射器将输入的合波信号反射回所述循环波长分合波器；
所述循环波长分合波器接收所述反射器反射的合波信号后，将所述反射器反射的合波信号分离为单频信号，分别确定与各分离后单频信号对应的目标输入端滤波窗口以及与所述目标输入端滤波窗口对应的所述循环波长分合波器的目标输入端，将各分离后单频信号通过所述目标输入端反馈至与所述目标输入端连接的多纵模激光器；
所述多纵模激光器锁定所述循环波长分合波器反馈单频信号的波长，生成与所述循环波长分合波器反馈单频信号的波长相同的信号并输出。
结合第二方面，在第二方面的第一种实施方式中，所述多纵模激光器与所述光分路器之间设置的45度法拉第旋光器，所述反射器为半透半反90度法拉第旋光镜。
结合第二方面或第二方面的第一种实施方式，在第二方面的第二种实施方式中，所述循环波长分合波器包括循环阵列波导光栅和标准具Etalon，所述循环阵列波导光栅的输入端连接所述法拉第旋光器的输出端，所述循环阵列波导光栅输出端连接所述Etalon的输入端，所述Etalon的输出端连接所述反射器的输入端。
结合第二方面或第二方面的第一种实施方式，在第二方面的第三种实施方式中，所述循环波长分合波器由N个串联的微环谐振腔构成，每个所述微环谐振腔对应所述循环波长分合波器的一个输入端，N个所述微环谐振腔 的输出端串联一并输出，构成循环波长分合波器的输出端，每个所述微环谐振腔具有重复周期为Δfband的滤波窗口，相邻两个所述微环谐振腔的滤波窗口之间相互间隔Δfch，其中，Δfband＝N*Δfch，N等于所述循环波长分合波器输入端个数。
第三方面，本发明的实施例提供一种波长可调谐的方法，用于光发射装置，所述光发射装置包括多个多纵模激光器、循环波长分合波器和反射器，每个所述多纵模激光器的输出端与所述循环波长分合波器的一个输入端连接，所述循环波长分合波器的输出端与所述反射器的输入端连接；所述方法包括：
所述多纵模激光器向所述循环波长分合波器输出具有周期重复频率间隔的多纵模信号，所述周期为Δfmode；
所述循环波长分合波器对输入的多纵模信号通过输入端滤波窗口进行周期重复滤波，得出与所述循环波长分合波器的输入端滤波窗口对应的单频信号，所述滤波窗口重复周期为Δfband，其中，Δfmode与Δfband不同，且Δfmode与Δfband不互为整倍数关系；
所述循环波长分合波器将各输入端滤波后的单频信号合波并通过所述循环波长分合波器的输出端将合波信号发送至所述反射器；
所述反射器将接收的合波信号中预设部分功率的合波信号反射回所述循环波长分合波器，所述接收的合波信号中除所述预设部分功率外的剩余信号从所述反射器的输出端输出；
所述循环波长分合波器将所述反射器反射的合波信号分离为单频信号，并分别确定与各分离后单频信号对应的目标输入端滤波窗口以及与所述目标输入端滤波窗口对应的所述循环波长分合波器的目标输入端；
所述循环波长分合波器分别将各分离后单频信号通过所述目标输入端反馈至与所述目标输入端连接的多纵模激光器；
所述多纵模激光器锁定所述循环波长分合波器反馈单频信号的波长，并生成与所述循环波长分合波器反馈单频信号的波长相同的信号并输出；
当需要调解所述多纵模激光器输出信号至目标波长的信号时，确定输出信号的当前波长；
计算所述多纵模激光器当前输出信号的波长与所述目标波长的差值a，以及所述Δfmode与所述Δfband之间的差值b；
将所述多纵模激光器输出信号的波长向靠近所述目标波长的方向调整，调整幅度为a/Δfmode-1+b。
第四方面，本发明的实施例提供一种波长可调谐的方法，用于光发射装置，所述光发射装置包括多个多纵模激光器、设置在每个所述多纵模激光器输出端的光分路器、所述循环波长分合波器和反射器；所述光分路器将所述多纵模激光器输出的信号分为两路，其中一路与所述循环波长分合波器的一个输入端连接，另一路将所述多纵模激光器输出的信号输出，所述循环波长分合波器的输出端与所述反射器的输入端连接；所述方法包括：
所述多纵模激光器向所述循环波长分合波器输出具有周期重复频率间隔的多纵模信号，所述周期为Δfmode；
所述循环波长分合波器对通过所述光分路器输入的多纵模信号通过输入端滤波窗口进行周期重复滤波，得出与所述循环波长分合波器的输入端滤波窗口对应的单频信号，所述滤波窗口重复周期为Δfband，其中，Δfmode与Δfband不同，且Δfmode与Δfband不互为整倍数关系；
所述循环波长分合波器将各输入端滤波后的单频信号合波并通过所述循环波长分合波器的输出端将合波信号发送至所述反射器；
所述反射器将输入的合波信号反射回所述循环波长分合波器；
所述循环波长分合波器将所述反射器反射的合波信号分离为单频信号，并分别确定与各分离后单频信号对应的目标输入端滤波窗口以及与所述目标输入端滤波窗口对应的所述循环波长分合波器的目标输入端；
所述循环波长分合波器分别将各分离后单频信号通过所述目标输入端反馈至与所述目标输入端连接的多纵模激光器；
所述多纵模激光器锁定所述循环波长分合波器反馈单频信号的波长， 并生成与所述循环波长分合波器反馈单频信号的波长相同的信号并输出；
当需要调解所述多纵模激光器输出信号至目标波长的信号时，计算所述多纵模激光器当前输出信号的波长与所述目标波长的差值a，以及所述Δfmode与所述Δfband之间的差值b；
将所述多纵模激光器输出信号的波长向靠近所述目标波长的方向调整，调整幅度为a/Δfmode-1+b。
本发明实施例提供一种波长可调谐的光发射装置，本发明实施例中多个多纵模激光器、循环波长分合波器和反射器构成光发射装置，首先循环波长分合波器通过对多纵模激光器输出的多纵模信号进行滤波得出光发射装置所需波长的合波信号，然后反射器将部分功率的合波信号反射回循环波长分合波器，循环波长分合波器将合波信号分离后反馈至多纵模激光器，使多纵模激光器根据反馈的信号的波长确定输出信号的波长，从而使多纵模激光器持续输出确定波长的信号，即光发射装置能够持续输出所需波长的合波信号；设置循环波长分合波器的输入端滤波窗口周期重复，多纵模激光器输出多纵模信号的频率间隔周期和循环波长分合波器的输入端滤波窗口重复周期不同且不互为整倍数关系，可以使多纵模激光器输出多纵模信号时，同一时刻只有一个信号可以从循环波长分合波器的滤波窗口通过，得出与此输入端滤波窗口对应的单频信号，当需要调谐信号的波长时，只需要平移多纵模激光器输出信号的光谱，就可使多纵模激光器输出的另一个信号对应循环波长分合波器的另一个滤波窗口，即循环波长分合波器对输入的多纵模信号滤波后得出与此时输入端滤波窗口对应的单频信号，由于前后两次的输入端滤波窗口的中心波长不同，则前后两次滤波得到单频信号的波长也不行同，即实现输出信号波长的调谐，本发明实施例中，多纵模激光器和循环波长分合波器结构简单，制作过程不需要精细的制造工艺和复杂的算法，简化了激光器设计和制作过程，降低光发射装置的成本。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例或现 有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图。
图1为本发明一实施例提供的波长可调谐的光发射装置结构示意图；
图2为本发明一实施例提供的波长可调谐的光发射装置波长调谐示意图；
图3为本发明一实施例提供的波长可调谐的光发射装置结构示意图；
图4为本发明一实施例提供的波长可调谐的光发射装置结构示意图；
图5为本发明一实施例提供的波长可调谐的光发射装置结构示意图；
图6为本发明一实施例提供的波长可调谐的光发射装置结构示意图；
图7为本发明一实施例提供的波长可调谐的光发射装置结构示意图；
图8为本发明又一实施例提供的波长可调谐的光发射装置结构示意图；
图9为本发明又一实施例提供的波长可调谐的方法流程图；
图10为本发明又一实施例提供的波长可调谐的方法流程图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。
为使本发明技术方案的优点更加清楚，下面结合附图和实施例对本发明作详细说明。
本发明一实施例提供一种波长可调谐的光发射装置，如图1所示，包括多个多纵模激光器1、循环波长分合波器2和反射器3；所述多纵模激光器1的输出端与所述循环波长分合波器2的一个输入端连接，所述循环波长分合波器2的输出端与所述反射器3的输入端连接，所述反射器3的输出端输出合波信号；所述多纵模激光器1输出具有周期重复频率间隔的多纵模信号，所 述周期为Δfmode；所述循环波长分合波器2对输入的多纵模信号通过输入端滤波窗口进行周期重复滤波，得出与所述循环波长分合波器2的输入端滤波窗口对应的单频信号，所述循环波长分合波器2将各输入端滤波后的单频信号合波并通过所述循环波长分合波器2的输出端将合波信号输出至所述反射器3，所述滤波窗口重复周期为Δfband，其中，Δfmode与Δfband不同，且Δfmode与Δfband不互为整倍数关系；所述反射器3将输入合波信号中预设部分功率的合波信号反射回所述循环波长分合波器2，所述输入合波信号中除所述预设部分功率外的剩余信号从所述反射器3的输出端输出；所述循环波长分合波器2接收所述反射器反射的合波信号后，将所述反射器3反射的合波信号分离为单频信号，分别确定与各分离后单频信号对应的目标输入端滤波窗口以及与所述目标输入端滤波窗口对应的所述循环波长分合波器2的目标输入端，将各分离后单频信号通过所述目标输入端反馈至与所述目标输入端连接的多纵模激光器1；多纵模激光器1锁定所述循环波长分合波器2反馈单频信号的波长，生成与所述循环波长分合波器2反馈单频信号的波长相同的信号并输出。
具体的，多纵模激光器1的实现方式，可以是基于法布里泊罗谐振腔或者环形谐振腔的半导体激光器。n个多纵模激光器1分别与循环波长分合波器2的n个输入端口相连接。反射器3可以为90度半透半返法拉第旋光镜(Faraday Rotation Mirror,FRM)，FRM将输入FRM的合波信号偏振态旋转90°，并将部分功率的合波信号反射，使其沿原路径分别反馈回到各多纵模激光器1中，而剩余合波信号则透射输出。
需要说明的是，多纵模激光器开始输出的为多纵模信号，循环波长分合波器2将多纵模激光器1输出的多纵模信号滤波为单频信号，然后合波输出到一根光纤端口，反射器3与循环波长分合波器2的输出端口连接，将一部分功率的合波信号经过循环波长分合波器2分波为单频信号后分别反馈回到各个多纵模激光器1中，多纵模激光器1锁定循环波长分合波器2反馈的单频信号的波长，在后续过程中生成与锁定的单频信号波长相同的单频信 号并输出至循环波长分合波器2的输入端，由此，多纵模激光器1、循环波长分合波器2的滤波窗口、以及反射器3，构成自注入反馈装置，可以实现把多纵模激光器1锁定在单纵模输出模式，从而保证多纵模激光器1在某一时刻输出一种波长的单频信号。多纵模激光器1的输出信号重复周期Δfmode，与循环波长分合波器2每个输入端口的滤波窗口中心波长重复周期Δfband存在频率偏差，即Δfmode与Δfband不同且Δfmode与Δfband不互为整倍数关系，由此，两者构成游标效应，其等效的自由光谱范围(Free Spectrum Range，FSR)为：FSR＝Δfmode*Δfband/(Δfmode-Δfband)，在一个FSR范围内，多纵模信号中有且只有一个激光器信号的波长与循环波长分合波器的滤波窗口中心波长相匹配，这样通过自注入反馈锁定，可以只允许波长匹配的纵模模式谐振，而其余波长不匹配的纵模模式均被抑制，实现将多纵模激光器的输出锁定在单频输出模式，且输出的单频信号波长与循环波长分合波器2滤波窗口中心波长对准。如果循环波长分合波器2的窗口与国际电信联盟标准栅格(International Telecommunication Unionstandardization grid，ITU-T grid)对准，那么循环波长分合波器2滤波锁定的单频信号波长也相应的与ITU-grid对准，因此本发明实施例的光发射装置无需额外的波长电流图调测，降低成本和使用的复杂度。另外，通过对多纵模激光器1的输出信号进行频移，频移量等于Δfmode与Δfband的差值，就可以实现多纵模将激光器1锁定的波长调谐到循环波长分合波器2下一个周期的滤波窗口，例如，如图2所示，循环波长分合波器2共有4个输入端口，输入端口之间间隔为fch，对应输入端口2的多纵模将激光器1输出波长为λmode1、λmode(1+m)和λmode(1+2m)的多个纵模，当前状态下多纵模信号中λmode1波长的信号与循环波长分合波器2中输入端口2的滤波窗口中心波长λ1相匹配，则多纵模将激光器1经过自注入反馈，锁定波长为λ1的信号，当需要锁定波长为λ(1+m)的信号时，调整多纵模将激光器1使频率向高频率方向移动Δfband-Δfmode的频移量，波长为λmode(1+m)的纵模信号将被频移至与循环波长分合波器2中输入端口2的滤 波窗口中心波长λ(1+m)相匹配，则多纵模将激光器1经过自注入反馈，锁定波长为λ(1+m)的信号，从而实现了波长调谐。
需要说明的是，本发明实施例的波长可调谐的光发射装置中，多个多纵模激光器1完全相同，这样可以进一步简化光发射装置的制作过程，降低成本。
本发明实施例中设置循环波长分合波器2的输入端滤波窗口周期重复，多纵模激光器1输出多纵模信号的频率间隔周期和循环波长分合波器2的输入端滤波窗口重复周期不同且不互为整倍数关系，可以使多纵模激光器1输出多纵模信号时，同一时刻只有一个信号可以从循环波长分合波器2的滤波窗口通过，得出与此输入端滤波窗口对应的单频信号，当需要调谐信号的波长时，只需要平移多纵模激光器1输出信号的光谱，就可使多纵模激光器1输出的另一个信号对应循环波长分合波器2的另一个滤波窗口，即循环波长分合波器2对输入的多纵模信号滤波后得出与此时输入端滤波窗口对应的单频信号，由于前后两次的输入端滤波窗口的中心波长不同，则前后两次滤波得到单频信号的波长也不行同，即实现输出信号波长的调谐，本发明实施例中，多纵模激光器1和循环波长分合波器2结构简单，制作过程不需要精细的制造工艺和复杂的算法，简化了激光器设计和制作过程，降低光发射装置的成本。
需要说明的是，对比传统的基于DFB/DBR等激光器的WDM光源，本发明实施例基于结构简单的法布里泊罗谐振腔或者环形谐振腔的半导体多纵模激光器，而且连接到循环波长分合波器2每一个端口的激光器都是相同的设计，这简化了激光器设计和制作，使系统整体成本可以降低。并且本发明实施例基于自注入反馈，多纵模激光器通过自注入反馈锁定至单频信号并输出，且单频信号波长自动对准循环波长分合波器2滤波窗口，而无需额外的调测，这降低了光发射装置的测试成本。
本发明实施例的一种实现方式中，如图3所示，多纵模激光器1的输出端连接45度法拉第旋光器4，法拉第旋光器4的输出端连接循环波长分合波 器2的输入端，由此45度法拉第旋光器4可以使循环波长分合波器2反馈的信号的偏振态恢复到信号由多纵模激光器1输出时的状态。
本发明实施例的一种实现方式中，如图4所示，反射器3包括光分路器5，所述光分路5器将所述循环波长分合波器2输出的合波信号分为两路，其中，一路连接全反射90度法拉第旋光镜6的输入端，所述反射器为全反射法拉第旋光镜，另一路将所述合波信号输出。
如此，通过光分路器5将循环波长分合波器2输出的合波信号分为两路，连接全反射90度法拉第旋光镜6的输入端的一路用于信号反馈，另一路将所述合波信号输出，与半反半透90度法拉第旋光镜起到相同的作用。
本发明实施例的一种实现方式中，如图5所示，在所述光分路器和所述全反射90度法拉第旋光镜之间设置标准具Etalon8。
本发明实施例的一种实现方式中，如图6所示，循环波长分合波器2包括循环阵列波导光栅7和标准具Etalon8，循环阵列波导光栅7的输入端连接法拉第旋光器4的输出端，循环阵列波导光栅7输出端连接Etalon8的输入端，Etalon8的输出端连接反射器3的输出端，Etalon8与循环阵列波导光栅7的滤波窗口对齐，实现如前述的多纵模激光器自注入反馈波长锁定精度的控制。
其中，循环波长分合波器2由一个有n个输入端口的循环阵列波导光栅7(Cyclic AWG)，以及在其输出端口所连接的Etalon构成8。其中，循环阵列波导光栅7可以是普通高斯型或者平顶型，每一个输入端口都是周期性的滤波窗口。Etalon8与循环阵列波导光栅7的滤波窗口对齐，实现如前述的多纵模激光器自注入反馈波长锁定精度的控制。
本发明实施例的一种实现方式中，如图7所示，循环波长分合波器2由N个串联的微环谐振腔9构成，每个微环谐振腔9对应循环波长分合波器2一个输入端，N个微环谐振腔9输出端串联一并输出，构成循环波长分合波器2的输出端，每个微环谐振腔9具有重复周期为Δfband的滤波窗口，且相邻两个微环谐振腔9的滤波窗口之间相互间隔Δfch，其中，Δfband＝N*Δfch， N等于循环波长分合波器2输入端个数。
其中，每个微环谐振腔9都对应一个输入端口，且都具有周期性的滤波窗口，滤波窗口的自由光谱范围FSR都是一样的，其FSR对应循环波长分合波器2的Δfband。各个微环谐振腔9滤波窗口谐振峰分别等间隔错开，相邻两个微环谐振腔的滤波窗口的间隔即为循环波长分合波器2的通道间隔Δfch。微环谐振腔的滤波带宽，实现如前述的多纵模激光器自注入反馈波长锁定精度的控制。
本发明又一实施例提供一种波长可调谐的光发射装置，如图8所示，包括多个多纵模激光器1、设置在多纵模激光器1输出端的光分路器5、所述循环波长分合波器2和反射器3；每个所述多纵模激光器1的输出端设置所述光分路器5，所述光分路器5将所述多纵模激光器1输出的信号分为两路，其中一路与所述循环波长分合波器2的一个输入端连接，所述循环波长分合波器2的输出端与所述反射器3的输入端连接，另一路将所述多纵模激光器1输出的信号输出；所述多纵模激光器1输出具有周期重复频率间隔的多纵模信号，所述周期为Δfmode；所述循环波长分合波器2对输入的多纵模信号通过输入端滤波窗口进行周期重复滤波，得出与所述循环波长分合波器的输入端滤波窗口对应的单频信号，所述循环波长分合波器2将各输入端录播后的单频信号合波并通过所述循环波长分合波器2的输出端将合波信号输出至所述反射器，所述滤波窗口重复周期为Δfband，其中，Δfmode与Δfband不同，且Δfmode与Δfband不互为整倍数关系；所述反射器3将输入的合波信号反射回所述循环波长分合波器2；所述循环波长分合波器2接收所述反射器3反射的合波信号后，将所述反射器反射的合波信号分离为单频信号，分别确定与各分离后单频信号对应的目标输入端滤波窗口以及与所述目标输入端滤波窗口对应的所述循环波长分合波器2的目标输入端，将各分离后单频信号通过所述目标输入端反馈至与所述目标输入端连接的多纵模激光器1；多纵模激光器1锁定所述循环波长分合波器2反馈单频信号的波长，生成与所述循环波长分合波器2反馈单频信号的波长相同的信号并输出。
需要说明的是，所述多纵模激光器1与所述光分路器之间设置的45度法拉第旋光器，所述反射器3为半透半反90度法拉第旋光镜。
本发明实施例的一种实施方式中，所述循环波长分合波器包括循环阵列波导光栅和标准具Etalon，所述循环阵列波导光栅的输入端连接所述法拉第旋光器的输出端，所述循环阵列波导光栅输出端连接所述Etalon的输入端，所述Etalon的输出端连接所述反射器的输入端。
本发明实施例的又一种实施方式中，所述循环波长分合波器由N个串联的微环谐振腔构成，每个所述微环谐振腔对应所述循环波长分合波器的一个输入端，N个所述微环谐振腔的输出端串联一并输出，构成循环波长分合波器的输出端，每个所述微环谐振腔具有重复周期为Δfband的滤波窗口，相邻两个所述微环谐振腔的滤波窗口之间相互间隔Δfch，其中，Δfband＝N*Δfch，N等于所述循环波长分合波器输入端个数。
本发明实施例的中循环波长分合波器2还可以由如图6和图7的实现方式实现，在此不再赘述。
需要说明的是，本发明实施例的波长可调谐的光发射装置中，多个多纵模激光器1完全相同，这样可以进一步简化光发射装置的制作过程，降低成本。
本发明实施例中设置循环波长分合波器2的输入端滤波窗口周期重复，多纵模激光器1输出多纵模信号的频率间隔周期和循环波长分合波器2的输入端滤波窗口重复周期不同且不互为整倍数关系，可以使多纵模激光器1输出多纵模信号时，同一时刻只有一个信号可以从循环波长分合波器2的滤波窗口通过，得出与此输入端滤波窗口对应的单频信号，当需要调谐信号的波长时，只需要平移多纵模激光器1输出信号的光谱，就可使多纵模激光器1输出的另一个信号对应循环波长分合波器2的另一个滤波窗口，即循环波长分合波器2对输入的多纵模信号滤波后得出与此时输入端滤波窗口对应的单频信号，由于前后两次的输入端滤波窗口的中心波长不同，则前后两次滤波得到单频信号的波长也不行同，即实现输出信号波长的调谐，本 发明实施例中，多纵模激光器1和循环波长分合波器2结构简单，制作过程不需要精细的制造工艺和复杂的算法，简化了激光器设计和制作过程，降低光发射装置的成本。
本发明又一实施例提供一种波长可调谐的方法，用于光发射装置，所述光发射装置包括多个多纵模激光器、循环波长分合波器和反射器，每个所述多纵模激光器的输出端与所述循环波长分合波器的一个输入端连接，所述循环波长分合波器的输出端与所述反射器的输入端连接；如图9所示，所述方法包括：
101、多纵模激光器向循环波长分合波器输出具有周期重复频率间隔的多纵模信号。
其中，周期为Δfmode，即多纵模信号之间频率间隔的周期为Δfmode。
102、循环波长分合波器对输入的多纵模信号通过输入端滤波窗口进行周期重复滤波，得出与循环波长分合波器的输入端滤波窗口对应的单频信号。
其中，滤波窗口重复周期为Δfband，即滤波窗口中心波长的重复周期为Δfband，Δfmode与Δfband不同，且Δfmode与Δfband不互为整倍数关系。
103、循环波长分合波器将各输入端滤波后的单频信号合波并通过循环波长分合波器的输出端将合波信号发送至反射器。
104、反射器将接收的合波信号中预设部分功率的合波信号反射回循环波长分合波器，接收的合波信号中除预设部分功率外的剩余信号从反射器的输出端输出。
105、循环波长分合波器将反射器反射的合波信号分离为单频信号，并分别确定与各分离后单频信号对应的目标输入端滤波窗口以及与目标输入端滤波窗口对应的循环波长分合波器的目标输入端。
106、循环波长分合波器分别将各分离后单频信号通过目标输入端反馈至与目标输入端连接的多纵模激光器。
107、多纵模激光器锁定循环波长分合波器反馈单频信号的波长，并生成与循环波长分合波器反馈单频信号的波长相同的信号并输出。
108、当需要调谐多纵模激光器输出信号至目标波长的信号时，光发射装置计算多纵模激光器当前输出信号的波长与目标波长的差值a，以及Δfmode与Δfband之间的差值b；
109、光发射装置将多纵模激光器输出信号的波长向靠近目标波长的方向调整，调整幅度为a/Δfmode-1+b。
需要说明的是，本发明实施例中波长可调谐的方法适用于图1至图7所示的装置。
本发明实施例中循环波长分合波器2的输入端滤波窗口周期重复，多纵模激光器输出多纵模信号的频率间隔周期和循环波长分合波器的输入端滤波窗口重复周期不同且不互为整倍数关系，可以使多纵模激光器输出多纵模信号时，同一时刻只有一个信号可以从循环波长分合波器的滤波窗口通过，得出与此输入端滤波窗口对应的单频信号，当需要调谐多纵模激光器输出信号至目标波长的信号时，首先计算多纵模激光器当前输出信号的波长与目标波长的差值a，以及Δfmode与Δfband之间的差值b，然后将多纵模激光器输出信号的波长向靠近目标波长的方向调整，调整幅度为a/Δfmode-1+b即刻，本发明实施例中，只需要平移多纵模激光器1输出信号的光谱即可实现对光发射装置的波长调谐，实现过程简单，不需要精细的制造工艺和复杂的算法，降低光发射装置的成本。
本发明实施例的一种实施方式中，多纵模激光器的输出端连接45度法拉第旋光器，法拉第旋光器的输出端连接循环波长分合波器的输入端；则步骤101具体为：
1011、多纵模激光器通过法拉第旋光器向循环波长分合波器输出多纵模信号。
本发明又一实施例提供一种波长可调谐的方法，用于光发射装置，所述光发射装置包括多个多纵模激光器、设置在每个所述多纵模激光器输出 端的光分路器、所述循环波长分合波器和反射器；所述光分路器将所述多纵模激光器输出的信号分为两路，其中一路与所述循环波长分合波器的一个输入端连接，另一路将所述多纵模激光器输出的信号输出，所述循环波长分合波器的输出端与所述反射器的输入端连接；如图10所示，所述方法包括：
201、多纵模激光器向循环波长分合波器输出具有周期重复频率间隔的多纵模信号。
其中，周期为Δfmode，即多纵模信号之间频率间隔的周期为Δfmode。
202、循环波长分合波器对通过光分路器输入的多纵模信号通过输入端滤波窗口进行周期重复滤波，得出与循环波长分合波器的输入端滤波窗口对应的单频信号。
其中，滤波窗口重复周期为Δfband，即滤波窗口中心波长的重复周期为Δfband，Δfmode与Δfband不同，且Δfmode与Δfband不互为整倍数关系。
203、循环波长分合波器将各输入端滤波后的单频信号合波并通过循环波长分合波器的输出端将合波信号发送至反射器。
204、反射器将输入的合波信号反射回循环波长分合波器。
205、循环波长分合波器将反射器反射的合波信号分离为单频信号，并分别确定与各分离后单频信号对应的目标输入端滤波窗口以及与目标输入端滤波窗口对应的循环波长分合波器的目标输入端。
206、循环波长分合波器分别将各分离后单频信号通过目标输入端反馈至与目标输入端连接的多纵模激光器。
207、多纵模激光器锁定循环波长分合波器反馈单频信号的波长，并生成与循环波长分合波器反馈单频信号的波长相同的信号并输出。
208、当需要调谐多纵模激光器输出信号至目标波长的信号时，光发射装置计算多纵模激光器当前输出信号的波长与目标波长的差值a，以及Δfmode与Δfband之间的差值b；
209、光发射装置将多纵模激光器输出信号的波长向靠近目标波长的方向调整，调整幅度为a/Δfmode-1+b。
本发明实施例中循环波长分合波器2的输入端滤波窗口周期重复，多纵模激光器输出多纵模信号的频率间隔周期和循环波长分合波器的输入端滤波窗口重复周期不同且不互为整倍数关系，可以使多纵模激光器输出多纵模信号时，同一时刻只有一个信号可以从循环波长分合波器的滤波窗口通过，得出与此输入端滤波窗口对应的单频信号，当需要调谐多纵模激光器输出信号至目标波长的信号时，首先计算多纵模激光器当前输出信号的波长与目标波长的差值a，以及Δfmode与Δfband之间的差值b，然后将多纵模激光器输出信号的波长向靠近目标波长的方向调整，调整幅度为a/Δfmode-1+b即刻，本发明实施例中，只需要平移多纵模激光器1输出信号的光谱即可实现对光发射装置的波长调谐，实现过程简单，不需要精细的制造工艺和复杂的算法，降低光发射装置的成本。
需要说明的是，本发明实施例中波长可调谐的方法适用于图8所示实施例对应的装置。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应该以权利要求的保护范围为准。

Claims (11)

  1. 一种波长可调谐的光发射装置，其特征在于，包括多个多纵模激光器、循环波长分合波器和反射器；
    所述多纵模激光器的输出端与所述循环波长分合波器的一个输入端连接，所述循环波长分合波器的输出端与所述反射器的输入端连接，所述反射器的输出端输出合波信号；
    所述多纵模激光器输出具有周期重复频率间隔的多纵模信号，所述周期为Δfmode；
    所述循环波长分合波器对输入的多纵模信号通过输入端滤波窗口进行周期重复滤波，得出与所述循环波长分合波器的输入端滤波窗口对应的单频信号，所述循环波长分合波器将各输入端滤波后的单频信号合波并通过所述循环波长分合波器的输出端将合波信号输出至所述反射器，所述滤波窗口重复周期为Δfband，其中，Δfmode与Δfband不同，且Δfmode与Δfband不互为整倍数关系；
    所述反射器将输入合波信号中预设部分功率的合波信号反射回所述循环波长分合波器，所述输入合波信号中除所述预设部分功率外的剩余信号从所述反射器的输出端输出；
    所述循环波长分合波器接收所述反射器反射的合波信号后，将所述反射器反射的合波信号分离为单频信号，分别确定与各分离后单频信号对应的目标输入端滤波窗口以及与所述目标输入端滤波窗口对应的所述循环波长分合波器的目标输入端，将各分离后单频信号通过所述目标输入端反馈至与所述目标输入端连接的多纵模激光器；
    所述多纵模激光器锁定所述循环波长分合波器反馈单频信号的波长，生成与所述循环波长分合波器反馈单频信号的波长相同的信号并输出。
  2. 根据权利要求1所述的光发射装置，其特征在于，所述多纵模激光器的输出端连接45度法拉第旋光器，所述法拉第旋光器的输出端连接所述循环波长分合波器的输入端。
  3. 根据权利要求1或2所述的光发射装置，其特征在于，所述反射器为半透半反90度法拉第旋光镜。
  4. 根据权利要求1或2所述的光发射装置，其特征在于，反射器包括光分路器和全反射90度法拉第旋光镜，所述光分路器将所述循环波长分合波器输出的合波信号分为两路，其中，一路连接全反射90度法拉第旋光镜的输入端，另一路将所述合波信号输出。
  5. 根据权利要求4所述的光发射装置，其特征在于，在所述光分路器和所述全反射90度法拉第旋光镜之间设置标准具Etalon。
  6. 根据权利要求1-4任一项所述的光发射装置，其特征在于，所述循环波长分合波器包括循环阵列波导光栅和标准具Etalon，所述循环阵列波导光栅的输入端连接所述法拉第旋光器的输出端，所述循环阵列波导光栅输出端连接所述Etalon的输入端，所述Etalon的输出端连接所述反射器的输入端。
  7. 根据权利要求1-4任一项所述的光发射装置，其特征在于，所述循环波长分合波器由N个串联的微环谐振腔构成，每个所述微环谐振腔对应所述循环波长分合波器的一个输入端，N个所述微环谐振腔的输出端串联一并输出，构成循环波长分合波器的输出端，每个所述微环谐振腔具有重复周期为Δfband的滤波窗口，相邻两个所述微环谐振腔的滤波窗口之间相互间隔Δfch，其中，Δfband＝N*Δfch，N等于所述循环波长分合波器输入端个数。
  8. 一种波长可调谐的光发射装置，其特征在于，包括多个多纵模激光器、设置在每个所述多纵模激光器输出端的光分路器、所述循环波长分合波器和反射器；
    所述光分路器将所述多纵模激光器输出的信号分为两路，其中一路与所述循环波长分合波器的一个输入端连接，另一路将所述多纵模激光器输出的信号输出，所述循环波长分合波器的输出端与所述反射器的输入端连接；
    所述多纵模激光器输出具有周期重复频率间隔的多纵模信号，所述周期为Δfmode；
    所述循环波长分合波器对通过光分路器输入的多纵模信号通过输入端滤波窗口进行周期重复滤波，得出与所述循环波长分合波器的输入端滤波窗口对应的单频信号，所述循环波长分合波器将各输入端录播后的单频信号合波并通过所述循环波长分合波器的输出端将合波信号输出至所述反射器，所述滤波窗口中心波长重复周期为Δfband，其中，Δfmode与Δfband不同，且Δfmode与Δfband不互为整倍数关系；
    所述反射器将输入的合波信号反射回所述循环波长分合波器；
    所述循环波长分合波器接收所述反射器反射的合波信号后，将所述反射器反射的合波信号分离为单频信号，分别确定与各分离后单频信号对应的目标输入端滤波窗口以及与所述目标输入端滤波窗口对应的所述循环波长分合波器的目标输入端，将各分离后单频信号通过所述目标输入端反馈至与所述目标输入端连接的多纵模激光器；
    所述多纵模激光器锁定所述循环波长分合波器反馈单频信号的波长，生成与所述循环波长分合波器反馈单频信号的波长相同的信号并输出。
  9. 根据权利要求8所述的光发射装置，其特征在于，所述多纵模激光器与所述光分路器之间设置的45度法拉第旋光器，所述反射器为全反90度法拉第旋光镜。
  10. 根据权利要求8或9所述的光发射装置，其特征在于，所述循环波长分合波器包括循环阵列波导光栅和标准具Etalon，所述循环阵列波导光栅的输入端连接所述法拉第旋光器的输出端，所述循环阵列波导光栅输出端连接所述Etalon的输入端，所述Etalon的输出端连接所述反射器的输入端。
  11. 根据权利要求8或9所述的光发射装置，其特征在于，所述循环波长分合波器由N个串联的微环谐振腔构成，每个所述微环谐振腔对应所述循环波长分合波器的一个输入端，N个所述微环谐振腔的输出端串联一并输 出，构成循环波长分合波器的输出端，每个所述微环谐振腔具有重复周期为Δfband的滤波窗口，相邻两个所述微环谐振腔的滤波窗口之间相互间隔Δfch，其中，Δfband＝N*Δfch，N等于所述循环波长分合波器输入端个数。
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US11664644B2 (en) * 2019-10-24 2023-05-30 Fujitsu Limited Wavelength tunable light source, optical transmission apparatus using the same, and method of controlling wavelength tunable light source
CN111064520A (zh) * 2019-12-19 2020-04-24 成都优博创通信技术股份有限公司 一种光模块
CN111064520B (zh) * 2019-12-19 2021-06-04 成都优博创通信技术股份有限公司 一种光模块

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EP3402093A4 (en) 2019-01-23
ES2901484T3 (es) 2022-03-22
US10567085B2 (en) 2020-02-18
EP3402093B1 (en) 2021-09-29
US20180375584A1 (en) 2018-12-27

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