WO2018201393A1 - 一种可调谐激光器 - Google Patents

一种可调谐激光器 Download PDF

Info

Publication number
WO2018201393A1
WO2018201393A1 PCT/CN2017/083052 CN2017083052W WO2018201393A1 WO 2018201393 A1 WO2018201393 A1 WO 2018201393A1 CN 2017083052 W CN2017083052 W CN 2017083052W WO 2018201393 A1 WO2018201393 A1 WO 2018201393A1
Authority
WO
WIPO (PCT)
Prior art keywords
band
wavelength
comb filter
filter
sinusoidal
Prior art date
Application number
PCT/CN2017/083052
Other languages
English (en)
French (fr)
Inventor
罗俊
冯志勇
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201780090001.1A priority Critical patent/CN110546834B/zh
Priority to PCT/CN2017/083052 priority patent/WO2018201393A1/zh
Publication of WO2018201393A1 publication Critical patent/WO2018201393A1/zh

Links

Images

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
    • H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
    • H01S5/042—Electrical excitation ; Circuits therefor
    • 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
    • H01S5/10—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
    • H01S5/14—External cavity lasers

Definitions

  • the present application relates to the field of optical communications, and in particular to a tunable laser.
  • Wavelength Division Multiplexing is a transmission technology in optical fiber communication. It uses a fiber to transmit multiple wavelengths of light at the same time, and divides the wavelength range that the fiber can be applied into into several bands. Each band acts as an independent channel to transmit an optical signal of a predetermined wavelength.
  • tunable lasers are now used to generate optical signals of different wavelengths.
  • a tunable laser is a laser that continuously changes the laser output wavelength within a certain range.
  • a prior art tunable laser is exemplified by a sampled fiber-distributed bragg reflector (SG-DBR) laser, as shown in FIG.
  • the SG-DBR laser includes an amplification region, a front Bragg grating, a gain region, a phase region, and a back Bragg grating.
  • the front Bragg grating and the back Bragg grating form two comb filters, and the two comb filters have different Free Spectral Ranges (FSRs).
  • FSRs Free Spectral Ranges
  • the spectrum filtered by the two comb filters is a single peak spectrum, so that a single wavelength laser can be output.
  • the bandpass filtering windows of the two filtering windows are respectively tuned, so that the overlapping portions of the corresponding bands of the two bandpass filtering windows correspond to different bands, and lasers of different wavelengths can be output.
  • the above method requires separately tuning two independent filtering windows, resulting in high wavelength tuning complexity.
  • the wavelength calibration of the comb filter is complicated. Taking 80 wavelengths in the C-band calibration as an example, 80 wavelengths correspond to 80 sets of different coordinates of two SG-DBR filters in the wavelength-tuned current map, and the coordinates corresponding to each wavelength are Irregular. In order to overlap the corresponding bands of the filter windows of the two comb filters on the specified band, it is necessary to respectively calibrate the wavelength coordinates of each of the two comb filters, which takes a long time and has low tuning efficiency.
  • the present application provides a tunable laser that is capable of reducing laser tuning time and improving laser tuning efficiency.
  • the first aspect provides a laser, comprising a gain module, a sinusoidal comb filter, a narrowband comb filter, a wavelength configuration circuit, and a wavelength tuning circuit; wherein the sinusoidal comb filter and the gain module and the narrowband comb filter respectively
  • the wavelength configuration circuit is connected, and the wavelength tuning circuit is connected to the narrow band comb filter.
  • the gain module generates an optical signal under the control of an external input current
  • the sinusoidal comb filter filters the optical signal generated by the gain module
  • the narrowband comb filter filters the filtered optical signal of the sinusoidal comb filter.
  • the sinusoidal comb filter has mutually spaced bandpass filtering windows
  • the narrowband comb filters have mutually spaced bandpass filtering windows.
  • the free spectral region of the sinusoidal comb filter is not less than the bandwidth of the gain spectrum of the gain block.
  • the first band is the center band corresponding to the bandpass filter window of the sinusoidal comb filter on the target band, and the target band is the gain spectrum of the gain block.
  • the corresponding band, the second band is the band corresponding to the band pass filter window of the narrow band comb filter on the target band.
  • the wavelength configuration circuit receives the wavelength information and sets the position of the first wavelength band according to the wavelength information
  • the wavelength The tuning circuit can tune the bandpass filtering window of the narrowband comb filter to overlap the first band and the second band, and the light generated by the gain module is filtered by the sinusoidal comb filter and the narrowband comb filter to output the laser. Since the free spectral region of the sinusoidal comb filter is not less than the bandwidth of the gain spectrum of the gain block, the sinusoidal comb filter has only one bandpass filter window on the target band. Compared with determining the wavelength coordinates of 80 sets of wavelengths, the present application only needs to determine the wavelength coordinates corresponding to a band pass filter window, so the process of setting the first band position is faster. In addition, by tuning the filter window of the narrow-band comb filter, laser tuning can be achieved without aligning the two filter windows, thus simplifying the laser tuning process and improving the laser tuning efficiency.
  • the wavelength configuration circuit when the wavelength corresponding to the wavelength information belongs to the first half of the target wavelength band, the wavelength configuration circuit is specifically configured to align the first wavelength band with the first half of the target wavelength band; When the wavelength belongs to the latter half of the target band, the wavelength configuration circuit is specifically configured to align the first band with the second half of the target band.
  • the bandwidth of the first band is equal to half of the bandwidth corresponding to the gain spectrum. In this way, the tunable laser is capable of laser tuning in the first half or the second half of the target band.
  • the FSR of the sinusoidal comb filter is equal to twice the FSR of the narrowband comb filter.
  • the sinusoidal comb filter is a Mach-Genzel filter or a ring resonator filter
  • the narrow-band comb filter is a distributed Bragg feedback filter or a ring resonator filter.
  • the material of the sinusoidal comb filter is indium phosphide, silicon on insulator or polymer waveguide, and the material of the narrow band comb filter is indium phosphide, on insulator Silicon or polymer waveguide.
  • the tunable laser further includes a phase adjustment module, and the phase adjustment module is respectively connected to the gain module and the sinusoidal comb filter.
  • the material of the phase adjustment module is indium phosphide, silicon on insulator or polymer waveguide.
  • a second aspect provides a tunable laser comprising a gain module, a narrowband comb filter, a sinusoidal comb filter, a wavelength tuning circuit, and a wavelength configuration circuit; wherein the narrowband comb filter is separately coupled to the gain module and the sinusoid comb filter
  • the device is connected to the wavelength tuning circuit, and the wavelength configuration circuit is connected to the sinusoidal comb filter.
  • the gain module generates an optical signal under the control of an external input current
  • the narrowband comb filter filters the optical signal generated by the gain module
  • the sinusoid comb filter filters the filtered optical signal of the narrowband comb filter.
  • the sinusoidal comb filter has mutually spaced bandpass filtering windows
  • the narrowband comb filters have mutually spaced bandpass filtering windows.
  • the free spectral region of the sinusoidal comb filter is not less than the bandwidth of the gain spectrum of the gain block.
  • the first band is the center band corresponding to the bandpass filter window of the sinusoidal comb filter on the target band, and the target band is the gain spectrum of the gain block.
  • the corresponding band, the second band is the band corresponding to the band pass filter window of the narrow band comb filter on the target band.
  • the wavelength tuning circuit can tune the band pass filter window of the narrow band comb filter to overlap the first band and the second band, and the gain block
  • the generated light is filtered by a sinusoidal comb filter and a narrowband comb filter to output a laser. Since the free spectral region of the sinusoidal comb filter is not less than the bandwidth of the gain spectrum of the gain block, the sinusoidal comb filter has only one bandpass filter window on the target band. Compared with determining the wavelength coordinates of 80 sets of wavelengths, the present application only needs to determine the wavelength coordinates corresponding to a band pass filter window, so the process of setting the first band position is faster.
  • the laser window can be laser tuned without aligning the two filter windows, thus simplifying the laser tuning process and improving laser tuning efficiency.
  • the wavelength configuration circuit when the wavelength corresponding to the wavelength information belongs to the first half of the target band, the wavelength configuration circuit is specifically configured to align the first band with the first half of the target band; When the corresponding wavelength belongs to the latter half of the target band, the wavelength configuration circuit is specifically configured to align the first band with the second half of the target band.
  • the bandwidth of the first band is equal to half of the bandwidth corresponding to the gain spectrum. In this way, the tunable laser is capable of laser tuning in the first half or the second half of the target band.
  • the FSR of the sinusoidal comb filter is equal to twice the FSR of the narrowband comb filter.
  • the sinusoidal comb filter is a Mach-Genzel filter or a ring resonator filter
  • the narrow-band comb filter is a distributed Bragg feedback filter or a ring resonator filter.
  • the material of the sinusoidal comb filter is indium phosphide, silicon on insulator or polymer waveguide, and the material of the narrow band comb filter is indium phosphide, on insulator Silicon or polymer waveguide.
  • the tunable laser further includes a phase adjustment module, and the phase adjustment module is respectively connected to the gain module and the narrowband comb filter.
  • the material of the phase adjustment module is indium phosphide, silicon on insulator or polymer waveguide.
  • the wavelength configuration circuit sets the position of the first band according to the wavelength information, and the wavelength tuning circuit can tune the band pass filter window of the narrow band comb filter to overlap the first band and the second band.
  • the light generated by the gain module is filtered by a sinusoidal comb filter and a narrow-band comb filter to form a single-peak filter spectrum on the target band, thereby outputting a laser.
  • the first band is a center band corresponding to a band pass filter window of the sinusoidal comb filter on the target band
  • the target band is a band corresponding to the gain spectrum of the gain block
  • the second band is a narrow band comb filter on the target band
  • the band corresponding to the bandpass filter window, the free spectral region of the sinusoidal comb filter is not less than the bandwidth of the gain spectrum of the gain block. Since the free spectral region of the sinusoidal comb filter is not less than the bandwidth of the gain spectrum of the gain block, the sinusoidal comb filter has only one bandpass filter window on the target band, compared to determining the wavelength coordinates of the 80 sets of wavelengths.
  • the application only needs to determine the wavelength coordinates corresponding to a bandpass filter window, so the process of setting the first band position is faster.
  • laser tuning can be achieved without aligning the two filter windows, thus simplifying the laser tuning process and improving the laser tuning efficiency.
  • FIG. 1 is a schematic view of a prior art SG-DBR laser
  • FIG. 2 is a schematic diagram of a filter spectrum of a SG-DBR laser in the prior art
  • FIG. 3 is a schematic structural diagram of a tunable laser in an embodiment of the present application.
  • FIG. 4 is a schematic diagram of a filter spectrum of a sinusoidal comb filter in an embodiment of the present application.
  • FIG. 5 is a schematic diagram of a filter spectrum of a sinusoidal comb filter and a filter spectrum of a narrowband comb filter according to an embodiment of the present application;
  • FIG. 6 is a schematic diagram of a filter spectrum of a tunable laser in an embodiment of the present application.
  • FIG. 7 is another schematic diagram of a filter spectrum of a sinusoidal comb filter in an embodiment of the present application.
  • FIG. 8 is a schematic diagram of a filter spectrum of a sinusoidal comb filter and a filter spectrum of a narrowband comb filter according to an embodiment of the present application;
  • FIG. 9 is a schematic diagram of a filter spectrum of a tunable laser in an embodiment of the present application.
  • FIG. 10 is another schematic structural diagram of a tunable laser in the embodiment of the present application.
  • FIG. 11 is another schematic structural diagram of a tunable laser in an embodiment of the present application.
  • FIG. 12 is another schematic structural diagram of a tunable laser in the embodiment of the present application.
  • one embodiment of the tunable laser 300 provided by the present application includes:
  • a gain module 301 a sinusoidal comb filter 302, a narrowband comb filter 303, a wavelength configuration circuit 304, and a wavelength tuning circuit 305;
  • the sinusoidal comb filter 302 is connected to the gain module 301, the narrowband comb filter 303 and the wavelength configuration circuit 304, respectively, and the wavelength tuning circuit 305 is connected to the narrowband comb filter 303;
  • a gain module 301 configured to generate an optical signal under the control of an external input current
  • the sinusoidal comb filter 302 has mutually spaced bandpass filtering windows for filtering the optical signal generated by the gain module 301, and the free spectral region of the sinusoidal comb filter is not less than the bandwidth of the gain spectrum of the gain module;
  • the narrowband comb filter 303 has mutually spaced bandpass filtering windows for filtering the filtered optical signal of the sinusoidal comb filter 302;
  • the wavelength configuration circuit 304 is configured to receive the wavelength information, and set the position of the first wavelength band according to the wavelength information.
  • the first wavelength band is a center band corresponding to the band pass filter window of the sinusoidal comb filter 302 on the target band, and the target band is a gain module.
  • the wavelength tuning circuit 305 is configured to tune the band pass filter window of the narrow band comb filter 303 such that the first band and the second band overlap, and the second band is corresponding to the band pass filter window of the narrow band comb filter 303 on the target band. Band.
  • the gain module 301 can be composed of a gain medium based on a quantum well or a quantum dot, and the gain medium can be, but not limited to, indium phosphide (InP).
  • the light generated by the gain module 301 includes light of a plurality of wavelengths, and the gain spectrum refers to a spectrum corresponding to light generated by the gain block.
  • the sinusoidal comb filter 302 has a first-order sinusoidal filter characteristic, that is, after the optical signal is filtered by the sinusoidal comb filter, the filtered spectrum is sinusoidally distributed over the band.
  • the bandpass filter window of the sinusoidal comb filter is periodically distributed and the filtered spectrum is a periodic sinusoid as shown in FIG.
  • the vertical axis represents the normalized optical power transfer coefficient
  • the horizontal axis represents the wavelength.
  • the band pass filter window of the sinusoidal comb filter corresponds to a band of ⁇ 1 to ⁇ 5, and the first band refers to ⁇ 2 to ⁇ 4, and the bandwidth of the first band is a 3dB bandwidth of the band pass filter window of the sinusoidal comb filter.
  • the FSR of the sinusoidal comb filter 302 is denoted as FSR1, and FSR1 is not smaller than the bandwidth corresponding to the gain spectrum.
  • Bands with a bandwidth equal to FSR1 include: ⁇ 1 to ⁇ 5, ⁇ 2 to ⁇ 6.
  • Bands having a bandwidth equal to 1/2 of FSR1 include: ⁇ 1 to ⁇ 3, ⁇ 3 to ⁇ 5, ⁇ 2 to ⁇ 4, and ⁇ 2 to ⁇ 6.
  • the optical signal with the wavelength ⁇ 3 has the least power attenuation, and the optical signal with the wavelength ⁇ 1 or ⁇ 5 has the largest attenuation.
  • the sinusoidal comb filter 302 may be a Mach-Zehnder filter or a sinusoidal comb filter based on a ring resonator.
  • the material of the sinusoidal comb filter 302 may be an optical waveguide material such as InP, silicon on insulator (Silicon On Insulator, SOI) or Polymer Waveguide.
  • the filtering characteristic of the narrowband comb filter 303 is a narrowband comb filter having a filter window corresponding to a bandwidth of less than 1 nanometer (nm).
  • the bandpass filter window distribution of the narrowband comb filter 303 is periodic, as shown in FIG.
  • the FSR of the narrowband comb filter is denoted as FSR2, and FSR2 is smaller than FSR1.
  • the bandwidth of ⁇ 3 to ⁇ 5 is equal to one FSR2.
  • the narrowband comb filter 303 may be a distributed Bragg grating filter or a narrowband comb filter based on a ring resonator.
  • the material of the narrowband comb filter 303 may be an optical waveguide material such as an InP, SOI or Polymer waveguide.
  • the target band may be, but is not limited to, the O-band, S-band, C-band, or L-band specified by the International Telecommunication Union (ITU) for optical fiber communication.
  • the O band means a band of 1260 nm to 1360 nm.
  • the S-band means a band of 1470 nm to 1530 nm, a C-band means a band of 1530 nm to 1565 nm, and an L-band means a band of 1565 nm to 1625 nm.
  • the wavelength configuration circuit refers to a single chip or control circuit having a wavelength configuration function.
  • the wavelength configuration circuit can adjust the band corresponding to the filter window of the sinusoidal comb filter by adjusting the output current or the output voltage.
  • the wavelength tuning circuit refers to a single chip or control circuit with a wavelength tuning function.
  • the wavelength tuning circuit can adjust the band corresponding to the filter window of the narrowband comb filter by adjusting the output current or the output voltage.
  • a single peak spectrum can be formed on the target band in the overlapping portion of the first band and the second band, and a single-wavelength laser can be output.
  • the laser light having other wavelengths in the target band is suppressed and cannot be output from the tunable laser 300.
  • the tunable range of the tunable laser 300 is equal to the tunable range of the narrowband comb filter 303.
  • the bandwidth of the first band is less than the tunable range of the narrowband comb filter, the tunable range of the tunable laser 300 is equal to the bandwidth of the first band.
  • the sinusoidal comb filter 302 filters the optical signal generated by the gain module 301, and the narrowband comb filter 303 pairs the sinusoidal comb filter 302.
  • the filtered optical signal is filtered.
  • the center wavelength of the first wavelength band and the center wavelength of the second wavelength band are both ⁇ 3
  • the filtered spectrum obtained by filtering by the two filters is a single peak spectrum, as shown in FIG. 6.
  • the wavelength at which the tunable laser 300 outputs laser light corresponds to the peak wavelength ⁇ 3.
  • the wavelength configuration circuit sets the position of the first band based on the wavelength information.
  • the wavelength tuning circuit tunes the filtering window of the narrowband comb filter to shift the overlapping portions of the first band and the second band, so that lasers of different wavelengths can be output to realize laser tuning. It can be seen that compared with the prior art, the tuning process of the present application is simple, the tuning time can be saved, and the laser tuning efficiency is improved.
  • the narrowband comb filter 303 is a ring resonator filter. After filtering the optical signal filtered by the sinusoidal comb filter 302 by the ring resonator filter, the filtered optical signal is output by the ring resonator filter.
  • the narrowband comb filter 303 is a distributed Bragg feedback filter. After the distributed Bragg feedback filter filters the optical signal filtered by the sinusoidal comb filter 302, the optical signal filtered by the distributed Bragg feedback filter is returned to the gain block 301 via the sinusoidal comb filter 302, at the gain.
  • the optical cavity formed by the module 301, the sinusoidal comb filter 302 and the distributed Bragg feedback filter oscillates back and forth, and finally from the gain Module 301 outputs a laser.
  • the bandwidth of the first band is equal to half of the bandwidth corresponding to the gain spectrum
  • the wavelength configuration circuit 304 is specifically configured to align the first band with the first half of the target band; when the wavelength corresponding to the wavelength information belongs to the second half of the target band, the wavelength The configuration circuit 304 is specifically configured to align the first band with the second half of the target band.
  • the wavelength configuration circuit 304 can compare the input wavelength information with a preset wavelength (such as the center wavelength of the target band), thereby identifying that the wavelength corresponding to the wavelength information is in the first half or the second half of the target band.
  • a preset wavelength such as the center wavelength of the target band
  • the filtered spectrum of the sinusoidal comb filter 302 is as shown in FIG.
  • the band pass filter window of the sinusoidal comb filter 302 corresponds to a band of ⁇ 1 to ⁇ 6, the first band is ⁇ 2 to ⁇ 4, and the band of the first band is a band pass of a sinusoidal comb filter.
  • the 3dB bandwidth of the filtering window When the center wavelength of the first wavelength band and the center wavelength of the second wavelength band are both ⁇ 3, the filter spectrum of the sinusoidal comb filter and the filter spectrum of the narrowband comb filter are as shown in FIG. 5.
  • the wavelength tuning circuit 305 can shift the position of the second band by tuning the band pass filter window of the narrow band comb filter 303, and output laser light of different wavelengths in the first half of the target band.
  • the filtered spectrum of the sinusoidal comb filter 302 is as shown in FIG.
  • the band pass filter window of the sinusoidal comb filter 302 corresponds to a band of ⁇ 3 to ⁇ 7
  • the first band is ⁇ 4 to ⁇ 6
  • the band of the first band is a band pass of a sinusoidal comb filter.
  • the 3dB bandwidth of the filtering window When the center wavelength of the first wavelength band and the center wavelength of the second wavelength band are both ⁇ 5, the filter spectrum of the sinusoidal comb filter and the filter spectrum of the narrowband comb filter are as shown in FIG.
  • the wavelength tuning circuit 305 can move the position of the second band by tuning the band pass filter window of the narrow band comb filter 303, and output laser light of different wavelengths in the latter half of the target band.
  • the present application can output a laser of a specified wavelength as long as the wavelength coordinate of a narrow-band comb filter on the target band is calibrated. Therefore, the tunable laser provided by the embodiment can quickly calibrate the wavelength coordinates, has less tuning time, and has high tuning efficiency.
  • a narrowband comb filter has a tunable range of only a few ten nm, so it cannot cover a wider range of bands.
  • the present application enables laser tuning in the first half or the second half of the target band by a combination of a sinusoidal comb filter and a narrowband comb filter to achieve laser tuning over the entire target band.
  • the FSR of the sinusoidal comb filter 302 is equal to twice the FSR of the narrowband comb filter 303.
  • the sinusoidal comb filter 302 has a band pass filter window corresponding to the band of the target band
  • the band corresponding to the two band pass filter windows of the narrow band comb filter 303 is in the target band, and is respectively recorded as the band A.
  • band B When the first band and the band A overlap in the first half of the target band, the band pass filter window of the narrow band comb filter 303 and the band stop filter window of the sinusoid comb filter 302 are aligned in the second half of the target band, then The optical signal in the latter half of the target band is suppressed.
  • the narrow band The bandpass filter window of the comb filter 303 is aligned with the bandstop filter window of the sinusoidal comb filter 302 in the first half of the target band, and the optical signal in the first half of the target band is suppressed.
  • the tunable laser 300 further includes a phase adjustment module 1001, as shown in FIG.
  • the phase adjustment module 1001 is coupled to the gain module 301 and the sinusoidal comb filter 302, respectively.
  • the phase adjustment module 1001 may be composed of an optical waveguide material such as an InP, SOI or Polymer waveguide.
  • the phase adjustment module 1001 adjusts the phase of the optical signal generated by the gain module 301, and supplies the phase-adjusted optical signal to the sinusoidal comb filter 302.
  • the tunable laser includes a gain block, a Mach Zender filter, a distributed Bragg grating filter, a wavelength tuning circuit, and a wavelength configuration circuit.
  • the target band is exemplified by 1530 nm to 1560 nm, and the wavelength information is exemplified by 1545 nm.
  • the wavelength configuration circuit determines that 1540 nm belongs to 1530 nm to 1545 nm (ie, the first half of the C-band), and sets the first band to 1530 nm to 1545 nm by arranging the phase difference of the interference arm of the Mach Zendel filter. alignment.
  • 1545 nm to 1560 nm corresponds to a band rejection filter window of the Mach Zendel filter.
  • the wavelength tuning circuit can adjust the center wavelength corresponding to the band pass filter window of the distributed Bragg grating filter to 1540 nm, thereby outputting a laser having a wavelength of 1540 nm.
  • the wavelength tuning circuit tunes the bandpass filtering window of the distributed Bragg grating filter, the center wavelength can be shifted from 1530 nm to 1545 nm, and the laser tuning can be performed in the first half of the C band.
  • the wavelength configuration circuit determines that 1550 nm belongs to 1545 nm to 1560 nm (ie, the second half of the C-band), and the first band and 1545 nm are configured by arranging the phase difference of the interference arm of the Mach-Zehnder filter. 1560nm alignment.
  • 1530 nm to 1545 nm corresponds to a band rejection filter window of the Mach Zendel filter.
  • the wavelength tuning circuit can adjust the center wavelength corresponding to the band pass filter window of the distributed Bragg grating filter to 1550 nm, thereby outputting a laser having a wavelength of 1550 nm.
  • the wavelength tuning circuit tunes the bandpass filtering window of the distributed Bragg grating filter, the center wavelength can be shifted from 1545 nm to 1560 nm, and the laser tuning can be performed in the latter half of the C band.
  • another embodiment of the tunable laser 1100 provided by the present application includes:
  • Gain module 1101 narrowband comb filter 1102, sinusoidal comb filter 1103, wavelength tuning circuit 1104 and wavelength configuration circuit 1105;
  • the narrowband comb filter 1102 is connected to the gain module 1101, the sinusoidal comb filter 1103 and the wavelength tuning circuit 1104, respectively, and the wavelength arrangement circuit 1105 is connected to the sinusoidal comb filter 1103;
  • a gain module 1101 configured to generate an optical signal under the control of an external input current
  • the narrowband comb filter 1102 has mutually spaced bandpass filtering windows for filtering the optical signals generated by the gain module 1101;
  • the sinusoidal comb filter 1103 has mutually spaced bandpass filtering windows for filtering the filtered optical signal of the narrowband comb filter 1102.
  • the free spectral region of the sinusoidal comb filter is not less than the bandwidth of the gain spectrum of the gain module. ;
  • the wavelength configuration circuit 1105 is configured to receive wavelength information, and set a position of the first wavelength band according to the wavelength information, the first wavelength band
  • the center band corresponding to the band pass filter window of the sinusoidal comb filter 1103 on the target band, and the target band is the band corresponding to the gain spectrum of the gain block;
  • the wavelength tuning circuit 1104 is configured to tune the band pass filtering window of the narrow band comb filter 1102 such that the first band and the second band overlap, and the second band is corresponding to the band pass filtering window of the narrow band comb filter 1102 on the target band. Band.
  • the gain module 1101 is similar to the gain module 301 in the embodiment of FIG. 3.
  • the narrowband comb filter 1102 is similar to the narrowband comb filter 303 of the embodiment of FIG. 3.
  • the sinusoidal comb filter 302 is similar to the wavelength tuned circuit 305 of the embodiment of FIG. 3.
  • the wavelength configurating circuit 1105 is similar to the wavelength configurating circuit 304 of the embodiment of FIG. 3 and will not be described herein.
  • a single peak spectrum can be formed on the target band in the overlapping portion of the first band and the second band, and a single-wavelength laser can be output.
  • the laser light having other wavelengths in the target band is suppressed and cannot be output from the tunable laser 1100.
  • the tunable range of the tunable laser 1100 is equal to the tunable range of the narrowband comb filter 1102.
  • the bandwidth of the first band is less than the tunable range of the narrowband comb filter, the tunable range of the tunable laser 1100 is equal to the bandwidth of the first band.
  • the narrowband comb filter 1102 filters the optical signal generated by the gain module 1101, and the sinusoidal comb filter 1103 pairs the narrowband comb filter 1102.
  • the filtered optical signal is filtered.
  • the optical signal gain curve obtained by filtering through the two filters is a single peak spectral curve, as shown in FIG. 6.
  • the narrowband comb filter is a ring resonator filter.
  • the sinusoidal comb filter 1103 filters the optical signal filtered by the ring resonator filter, the filtered optical signal is output by the sinusoidal comb filter 1103.
  • the tunable laser 1100 further includes a reflective module coupled to the sinusoidal comb filter 1103, the reflective module capable of reflecting the filtered optical signal from the sinusoidal comb filter 1103 back to the sinusoidal comb filter 1103
  • the optical signal is returned to the narrowband comb filter 1102 and the gain module 1101, oscillated back and forth in the optical cavity formed by the gain module 1101, the narrowband comb filter 1102, and the sinusoidal comb filter 1103, and finally outputted from the gain module 1101. laser.
  • the bandwidth of the first band is equal to half of the bandwidth corresponding to the gain spectrum
  • the wavelength configuration circuit 1105 is specifically configured to align the first band with the first half of the target band; when the wavelength corresponding to the wavelength information belongs to the second half of the target band, the wavelength The configuration circuit 1105 is specifically configured to align the first band with the second half of the target band.
  • the process of setting the position of the first wavelength band by the wavelength configuration circuit 1105 is similar to the process of setting the position of the first wavelength band by the wavelength configuration circuit 304 in the alternative embodiment of the embodiment shown in FIG. 2.
  • the FSR of the sinusoidal comb filter 1103 is equal to twice the FSR of the narrowband comb filter 1102.
  • the sinusoidal comb filter 1103 when the sinusoidal comb filter 1103 has a band pass filter window corresponding to the band of the target band, the band corresponding to the two band pass filter windows of the narrow band comb filter 1102 is in the target band, and is respectively recorded as the band A. And wave Paragraph B.
  • the band pass filter window of the narrow band comb filter 1102 and the band stop filter window of the sinusoid comb filter 1103 are aligned in the second half of the target band, then The optical signal in the latter half of the target band is suppressed.
  • the band pass filter window of the narrow band comb filter 1102 and the band stop filter window of the sinusoid comb filter 1103 are aligned in the first half of the target band, then The optical signal in the first half of the target band is suppressed.
  • the tunable laser 1100 further includes a phase adjustment module 1201, as shown in FIG.
  • the phase adjustment module 1201 is connected to the gain module 1101 and the narrowband comb filter 1102, respectively.
  • the phase adjustment module 1201 may be composed of a planar optical waveguide material such as InP, SOI or a polymer waveguide.
  • the phase adjustment module 1201 adjusts the phase of the optical signal generated by the gain module 1101, and supplies the phase-adjusted optical signal to the narrow-band comb filter 1102.
  • the wavelength configuration circuit and the wavelength tuning circuit may be independent or integrated in one device.

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Lasers (AREA)
  • Semiconductor Lasers (AREA)

Abstract

一种可调谐激光器（300、1100），包括增益模块（301、1101）、正弦梳状滤波器（302、1103）、窄带梳状滤波器（303、1102）、波长配置电路（304、1105）和波长调谐电路（305、1104）。正弦梳状滤波器（302、1103）具有相互间隔的带通滤波窗口，窄带梳状滤波器（303、1102）具有相互间隔的带通滤波窗口。波长配置电路（304、1105）用于接收波长信息，根据波长信息设置第一波段的位置，波长调谐电路（305、1104）用于调谐窄带梳状滤波器（303、1102）的带通滤波窗口，使第一波段和第二波段重叠。可调谐激光器（300、1100）能够快速调谐激光。

Description

一种可调谐激光器 技术领域
本申请涉及光通信领域，尤其涉及一种可调谐激光器。
背景技术
波分复用(Wavelength Division Multiplexing，WDM)是光纤通信中的一种传输技术，它利用一根光纤可以同时传输多个不同波长的光的特点，把光纤可能应用的波长范围划分成若干个波段，每个波段用作一个独立的通道传输一种预定波长的光信号。为了实现波分复用技术，现在使用可调谐激光器(tunable laser)来产生不同波长的光信号。可调谐激光器是指在一定范围内可以连续改变激光输出波长的激光器。
现有技术的可调谐激光器以取样光栅分布式布拉格反射镜(sampled fiber grating-distributed bragg reflector，SG-DBR)激光器为例，如图1所示。SG-DBR激光器包括放大区、前布拉格光栅、增益区、相位区和后布拉格光栅。前布拉格光栅和后布拉格光栅构成两个梳状滤波器，且两个梳状滤波器的自由光谱区(Free Spectral Range，FSR)不等。请参阅图2，纵轴表示滤波器的反射系数，横轴表示波长。当两个梳状滤波器的带通滤波窗口对应的波段重叠时，经两个梳状滤波器滤波后的光谱为单波峰光谱，这样就可以输出单波长激光。基于游标效应，分别调谐两个滤波窗口的带通滤波窗口，使两个带通滤波窗口对应波段的重叠部分对应不同波段，可以输出不同波长的激光。
从以上可以看出，上述方法需要分别调谐两个独立的滤波窗口，导致波长调谐复杂度高。并且，梳状滤波器的波长标定复杂，以C波段标定80个波长为例，80个波长对应波长调谐电流图中两个SG-DBR滤波器的80组不同的坐标，各波长对应的坐标是不规则的。为了将两个梳状滤波器的滤波窗口对应波段在指定波段上重叠，需要分别对两个梳状滤波器的每个波长标定波长坐标，花费时间长，调谐效率低。
发明内容
本申请提供了一种可调谐激光器，其能够减少激光调谐时间，提高激光调谐效率。
第一方面提供一种激光器，包括增益模块、正弦梳状滤波器、窄带梳状滤波器、波长配置电路和波长调谐电路；其中，正弦梳状滤波器分别与增益模块、窄带梳状滤波器及波长配置电路连接，波长调谐电路与窄带梳状滤波器连接。增益模块在外部输入电流的控制下产生光信号，正弦梳状滤波器对增益模块产生的光信号进行滤波，窄带梳状滤波器对正弦梳状滤波器滤波后的光信号再进行滤波。正弦梳状滤波器具有相互间隔的带通滤波窗口，窄带梳状滤波器具有相互间隔的带通滤波窗口。正弦梳状滤波器的自由光谱区不小于增益模块的增益谱的带宽，第一波段为在目标波段上正弦梳状滤波器的带通滤波窗口对应的中心波段，目标波段为增益模块的增益谱对应的波段，第二波段为在目标波段上窄带梳状滤波器的带通滤波窗口对应的波段。
这样，当波长配置电路接收波长信息，根据波长信息设置第一波段的位置之后，波长 调谐电路能调谐窄带梳状滤波器的带通滤波窗口，使第一波段和第二波段重叠，从增益模块产生的光经过正弦梳状滤波器和窄带梳状滤波器滤波后，输出激光。由于正弦梳状滤波器的自由光谱区不小于增益模块的增益谱的带宽，因此正弦梳状滤波器在目标波段上仅有一个带通滤波窗口。与确定80组波长的波长坐标相比，本申请仅需要确定一个带通滤波窗口对应的波长坐标，因此设置第一波段位置的过程更快。另外，通过调谐窄带梳状滤波器的滤波窗口就可以实现激光调谐，无需将两个滤波窗口对准，因此简化了激光调谐过程，能够提高激光调谐效率。
在第一方面的一种可能的实现方式中，当波长信息对应的波长属于目标波段的前半部分时，波长配置电路具体用于将第一波段与目标波段的前半部分对准；当波长信息对应的波长属于目标波段的后半部分时，波长配置电路具体用于将第一波段与目标波段的后半部分对准。其中，第一波段的带宽等于增益谱对应的带宽的一半。这样，可调谐激光器能够在目标波段的前半部分或后半部分实现激光调谐。
在第一方面的另一种可能的实现方式中，正弦梳状滤波器的FSR等于窄带梳状滤波器的FSR的两倍。
在第一方面的另一种可能的实现方式中，正弦梳状滤波器为马赫增德尔滤波器或环形谐振腔滤波器，窄带梳状滤波器为分布式布拉格反馈滤波器或环形谐振腔滤波器。
在第一方面的另一种可能的实现方式中，正弦梳状滤波器的材料为磷化铟、绝缘体上的硅或聚合物波导，窄带梳状滤波器的材料为磷化铟、绝缘体上的硅或聚合物波导。
在第一方面的另一种可能的实现方式中，可调谐激光器还包括相位调整模块，相位调整模块分别与增益模块及正弦梳状滤波器连接。
在第一方面的另一种可能的实现方式中，相位调整模块的材料为磷化铟、绝缘体上的硅或聚合物波导。
第二方面提供一种可调谐激光器，包括增益模块、窄带梳状滤波器、正弦梳状滤波器、波长调谐电路和波长配置电路；其中，窄带梳状滤波器分别与增益模块、正弦梳状滤波器及波长调谐电路连接，波长配置电路与正弦梳状滤波器连接。增益模块在外部输入电流的控制下产生光信号，窄带梳状滤波器对增益模块产生的光信号进行滤波，正弦梳状滤波器对窄带梳状滤波器滤波后的光信号再进行滤波。正弦梳状滤波器具有相互间隔的带通滤波窗口，窄带梳状滤波器具有相互间隔的带通滤波窗口。正弦梳状滤波器的自由光谱区不小于增益模块的增益谱的带宽，第一波段为在目标波段上正弦梳状滤波器的带通滤波窗口对应的中心波段，目标波段为增益模块的增益谱对应的波段，第二波段为在目标波段上窄带梳状滤波器的带通滤波窗口对应的波段。
这样，当波长配置电路接收波长信息，根据波长信息设置第一波段的位置之后，波长调谐电路能调谐窄带梳状滤波器的带通滤波窗口，使第一波段和第二波段重叠，从增益模块产生的光经过正弦梳状滤波器和窄带梳状滤波器滤波后，输出激光。由于正弦梳状滤波器的自由光谱区不小于增益模块的增益谱的带宽，因此正弦梳状滤波器在目标波段上仅有一个带通滤波窗口。与确定80组波长的波长坐标相比，本申请仅需要确定一个带通滤波窗口对应的波长坐标，因此设置第一波段位置的过程更快。另外，通过调谐窄带梳状滤波器 的滤波窗口就可以实现激光调谐，无需将两个滤波窗口对准，因此简化了激光调谐过程，能够提高激光调谐效率。
在第二方面的另一种可能的实现方式中，当波长信息对应的波长属于目标波段的前半部分时，波长配置电路具体用于将第一波段与目标波段的前半部分对准；当波长信息对应的波长属于目标波段的后半部分时，波长配置电路具体用于将第一波段与目标波段的后半部分对准。其中，第一波段的带宽等于增益谱对应的带宽的一半。这样，可调谐激光器能够在目标波段的前半部分或后半部分实现激光调谐。
在第二方面的另一种可能的实现方式中，正弦梳状滤波器的FSR等于窄带梳状滤波器的FSR的两倍。
在第二方面的另一种可能的实现方式中，正弦梳状滤波器为马赫增德尔滤波器或环形谐振腔滤波器，窄带梳状滤波器为分布式布拉格反馈滤波器或环形谐振腔滤波器。
在第二方面的另一种可能的实现方式中，正弦梳状滤波器的材料为磷化铟、绝缘体上的硅或聚合物波导，窄带梳状滤波器的材料为磷化铟、绝缘体上的硅或聚合物波导。
在第二方面的另一种可能的实现方式中，可调谐激光器还包括相位调整模块，相位调整模块分别与增益模块及窄带梳状滤波器连接。
在第二方面的另一种可能的实现方式中，相位调整模块的材料为磷化铟、绝缘体上的硅或聚合物波导。
在本申请提供的可调谐激光器中，波长配置电路根据波长信息设置第一波段的位置，波长调谐电路能调谐窄带梳状滤波器的带通滤波窗口，使第一波段和第二波段重叠，从增益模块产生的光经正弦梳状滤波器和窄带梳状滤波器滤波后，能够在目标波段上形成单波峰的滤波光谱，从而输出激光。其中，第一波段为在目标波段上正弦梳状滤波器的带通滤波窗口对应的中心波段，目标波段为增益模块的增益谱对应的波段，第二波段为在目标波段上窄带梳状滤波器的带通滤波窗口对应的波段，正弦梳状滤波器的自由光谱区不小于增益模块的增益谱的带宽。由于正弦梳状滤波器的自由光谱区不小于增益模块的增益谱的带宽，因此正弦梳状滤波器在目标波段上仅有一个带通滤波窗口，与确定80组波长的波长坐标相比，本申请仅需要确定一个带通滤波窗口对应的波长坐标，因此设置第一波段位置的过程更快。另外，通过调谐窄带梳状滤波器的滤波窗口就可以实现激光调谐，无需将两个滤波窗口对准，因此简化了激光调谐过程，能够提高激光调谐效率。
附图说明
图1为现有技术中SG-DBR激光器的一个示意图；
图2为现有技术中SG-DBR激光器的滤波光谱的一个示意图；
图3为本申请实施例中可调谐激光器的一个结构示意图；
图4为本申请实施例中正弦梳状滤波器的滤波光谱的一个示意图；
图5为本申请实施例中正弦梳状滤波器的滤波光谱和窄带梳状滤波器的滤波光谱的一个示意图；
图6为本申请实施例中可调谐激光器的滤波光谱的一个示意图；
图7为本申请实施例中正弦梳状滤波器的滤波光谱的另一个示意图；
图8为本申请实施例中正弦梳状滤波器的滤波光谱和窄带梳状滤波器的滤波光谱的一个示意图；
图9为本申请实施例中可调谐激光器的滤波光谱的一个示意图；
图10为本申请实施例中可调谐激光器的另一个结构示意图；
图11为本申请实施例中可调谐激光器的另一个结构示意图；
图12为本申请实施例中可调谐激光器的另一个结构示意图。
具体实施方式
请参阅图3，本申请提供的可调谐激光器300的一个实施例包括：
增益模块301、正弦梳状滤波器302、窄带梳状滤波器303、波长配置电路304以及波长调谐电路305；
正弦梳状滤波器302分别与增益模块301、窄带梳状滤波器303和波长配置电路304连接，波长调谐电路305与窄带梳状滤波器303连接；
增益模块301，用于在外部输入电流的控制下产生光信号；
正弦梳状滤波器302具有相互间隔的带通滤波窗口，用于对增益模块301产生的光信号进行滤波，正弦梳状滤波器的自由光谱区不小于增益模块的增益谱的带宽；
窄带梳状滤波器303具有相互间隔的带通滤波窗口，用于对正弦梳状滤波器302滤波后的光信号进行滤波；
波长配置电路304用于接收波长信息，根据波长信息设置第一波段的位置，第一波段为在目标波段上正弦梳状滤波器302的带通滤波窗口对应的中心波段，目标波段为增益模块的增益谱对应的波段；
波长调谐电路305用于调谐窄带梳状滤波器303的带通滤波窗口，使第一波段和第二波段重叠，第二波段为在目标波段上窄带梳状滤波器303的带通滤波窗口对应的波段。
其中，增益模块301可以由基于量子阱或量子点的增益介质构成，增益介质可以是但不限于磷化铟(indium phosphide，InP)。增益模块301产生的光包括多个波长的光，增益谱是指增益模块产生的光对应的光谱。
正弦梳状滤波器302具有一阶正弦滤波特性，即光信号经过正弦梳状滤波器滤波之后，滤波光谱在波段上分布呈正弦曲线。在一个可选实施例中，正弦梳状滤波器的带通滤波窗口分布呈周期性，滤波光谱为周期性正弦曲线，如图4所示。在图4所示的滤波光谱中，纵轴代表归一化光功率传递系数，横轴代表波长。其中，正弦梳状滤波器的带通滤波窗口对应的波段为λ1到λ5，第一波段是指λ2到λ4，第一波段的带宽为正弦梳状滤波器的带通滤波窗口的3dB带宽。将正弦梳状滤波器302的FSR记为FSR1，FSR1不小于增益谱对应的带宽。带宽等于FSR1的波段包括：λ1到λ5，λ2到λ6。带宽等于FSR1的1/2的波段包括：λ1到λ3，λ3到λ5，λ2到λ4，λ2到λ6。波长为λ3的光信号功率衰减最少，波长为λ1或λ5的光信号功率衰减最大。正弦梳状滤波器302可以是马赫增德尔滤波器，还可以是基于环形谐振腔的正弦梳状滤波器。正弦梳状滤波器302的材料可以是光波导材料，例如InP、绝缘体上的硅(Silicon  On Insulator，SOI)或高分子聚合物(Polymer)波导。
窄带梳状滤波器303的滤波特性是窄带梳状滤波，其滤波窗口对应带宽小于1纳米(nm)。在一个可选实施例中，窄带梳状滤波器303的带通滤波窗口分布呈周期性，如图5所示。窄带梳状滤波器的FSR记为FSR2，FSR2小于FSR1。在图5所示的滤波光谱中，λ3到λ5的带宽等于一个FSR2。窄带梳状滤波器303可以是分布式布拉格光栅滤波器，还可以是基于环形谐振腔的窄带梳状滤波器。窄带梳状滤波器303的材料可以是光波导材料，例如InP、SOI或Polymer波导。
目标波段可以是但不限于国际电信联盟(International Telecommunication Union，ITU)对光纤通信规定的O波段、S波段、C波段或L波段。O波段是指1260nm～1360nm的波段。S波段是指1470nm～1530nm的波段C波段是指1530nm～1565nm的波段，L波段是指1565nm～1625nm的波段。
波长配置电路是指具有波长配置功能的单片机或控制电路。波长配置电路通过调节输出电流或输出电压，可以调节正弦梳状滤波器的滤波窗口对应的波段。
波长调谐电路是指具有波长调谐功能的单片机或控制电路。波长调谐电路通过调节输出电流或输出电压，可以调节窄带梳状滤波器的滤波窗口对应的波段。
需要说明的是，在目标波段上只有在第一波段和第二波段的重叠部分，能够形成单波峰光谱，输出单波长激光。波长处于目标波段的其他部分的激光受到抑制，无法从可调谐激光器300输出。
当第一波段的带宽大于或等于窄带梳状滤波器303的可调谐范围时，可调谐激光器300的可调谐范围等于窄带梳状滤波器303的可调谐范围。当第一波段的带宽小于窄带梳状滤波器的可调谐范围时，可调谐激光器300的可调谐范围等于第一波段的带宽。
本实施例中，增益模块301在外部注入电流的控制下产生光信号之后，正弦梳状滤波器302对增益模块301产生的光信号进行滤波，窄带梳状滤波器303对正弦梳状滤波器302滤波后的光信号进行滤波。当第一波段的中心波长和第二波段的中心波长均为λ3时，经过两个滤波器的滤波后得到的滤波光谱为单波峰光谱，如图6所示。这样，可调谐激光器300输出激光的波长对应于峰值波长λ3。
其次，波长配置电路根据波长信息设置第一波段的位置。波长调谐电路调谐窄带梳状滤波器的滤波窗口，使第一波段和第二波段的重叠部分平移，这样就能输出不同波长的激光，实现激光调谐。由此可见，与现有技术相比，本申请调谐过程简单，能够节省调谐时间，提高激光调谐效率。
在一个可选实施例中，窄带梳状滤波器303为环形谐振腔滤波器。在环形谐振腔滤波器对正弦梳状滤波器302滤波后的光信号进行滤波之后，由环形谐振腔滤波器输出滤波后的光信号。
在另一个可选实施例中，窄带梳状滤波器303为分布式布拉格反馈滤波器。在分布式布拉格反馈滤波器对正弦梳状滤波器302滤波后的光信号进行滤波之后，经分布式布拉格反馈滤波器滤波后的光信号经正弦梳状滤波器302返回至增益模块301，在增益模块301、正弦梳状滤波器302和分布式布拉格反馈滤波器形成的光谐振腔内来回振荡，最后从增益 模块301输出激光。
基于图3所示实施例，在一个可选实施例中，
第一波段的带宽等于增益谱对应的带宽的一半；
当波长信息对应的波长属于目标波段的前半部分时，波长配置电路304具体用于将第一波段与目标波段的前半部分对准；当波长信息对应的波长属于目标波段的后半部分时，波长配置电路304具体用于将第一波段与目标波段的后半部分对准。
本实施例中，波长配置电路304可以将输入的波长信息与预设波长(如目标波段的中心波长)比较，从而识别出该波长信息对应的波长处于目标波段的前半部分或者后半部分。
在第一波段与目标波段的前半部分对准的情况下，正弦梳状滤波器302的滤波光谱如图4所示。在图4所示的滤波光谱中，正弦梳状滤波器302的带通滤波窗口对应波段为λ1到λ6，第一波段为λ2到λ4，第一波段的带宽为正弦梳状滤波器的带通滤波窗口的3dB带宽。当第一波段的中心波长和第二波段的中心波长均为λ3时，正弦梳状滤波器的滤波光谱和窄带梳状滤波器的滤波光谱如图5所示。此时，经两个滤波器滤波后的光谱形成单波峰光谱，如图6所示。这样输出激光的波长为λ3。波长调谐电路305通过调谐窄带梳状滤波器303的带通滤波窗口，能够移动第二波段的位置，在目标波段的前半部分上输出不同波长的激光。
在第一波段与目标波段的后半部分对准的情况下，正弦梳状滤波器302的滤波光谱如图7所示。在图7所示的滤波光谱中，正弦梳状滤波器302的带通滤波窗口对应波段为λ3到λ7，第一波段为λ4到λ6，第一波段的带宽为正弦梳状滤波器的带通滤波窗口的3dB带宽。当第一波段的中心波长和第二波段的中心波长均为λ5时，正弦梳状滤波器的滤波光谱和窄带梳状滤波器的滤波光谱如图8所示。此时，经两个滤波器滤波后的光谱形成单波峰光谱，如图9所示。这样输出激光的波长为λ5。波长调谐电路305通过调谐窄带梳状滤波器303的带通滤波窗口，能够移动第二波段的位置，在目标波段的后半部分上输出不同波长的激光。
由此可见，本申请只要对一个窄带梳状滤波器在目标波段上的波长坐标进行标定，就能输出指定波长的激光。因此本实施例提供的可调谐激光器能够快速标定波长坐标，调谐时间少，调谐效率高。
需要说明的是，一个窄带梳状滤波器的可调谐范围只有十几nm，因此无法覆盖范围更大的波段。本申请通过正弦梳状滤波器和窄带梳状滤波器的组合，能够在目标波段的前半部分或后半部分实现激光调谐，从而在整个目标波段上实现激光调谐。
基于前一实施例，在另一个可选实施例中，正弦梳状滤波器302的FSR等于窄带梳状滤波器303的FSR的两倍。
本实施例中，当正弦梳状滤波器302有一个带通滤波窗口对应波段处于目标波段时，窄带梳状滤波器303有两个带通滤波窗口对应的波段处于目标波段，分别记为波段A和波段B。当第一波段和波段A在目标波段的前半部分重叠时，窄带梳状滤波器303的带通滤波窗口与正弦梳状滤波器302的带阻滤波窗口在目标波段的后半部分对准，则在目标波段的后半部分的光信号受到抑制。当第一波段和波段B在目标波段的后半部分重叠时，窄带 梳状滤波器303的带通滤波窗口与正弦梳状滤波器302的带阻滤波窗口在目标波段的前半部分对准，则在目标波段的前半部分的光信号受到抑制。
在另一个可选实施例中，可调谐激光器300还包括相位调整模块1001，如图10所示。相位调整模块1001分别与增益模块301和正弦梳状滤波器302连接。
本实施例中，相位调整模块1001可以是由光波导材料构成，例如InP、SOI或Polymer波导。相位调整模块1001对增益模块301产生的光信号的相位进行调整，将调整相位后的光信号输送给正弦梳状滤波器302。
为便于理解，下面以一个具体应用场景对本申请中可调谐激光器进行详细介绍：
可调谐激光器包括增益模块，马赫增德尔滤波器、分布式布拉格光栅滤波器、波长调谐电路和波长配置电路。
下面对可调谐激光器的使用流程进行说明：
目标波段以1530nm～1560nm为例，波长信息以1545nm为例。
当用户在波长配置电路输入1540nm时，波长配置电路确定1540nm属于1530nm～1545nm(即C波段的前半部分)，通过配置马赫增德尔滤波器的干涉臂的相位差，将第一波段与1530nm～1545nm对准。这样1545nm～1560nm与马赫增德尔滤波器的一个带阻滤波窗口对应。波长调谐电路可以将分布式布拉格光栅滤波器的带通滤波窗口对应的中心波长调整至1540nm，从而输出波长为1540nm的激光。当波长调谐电路调谐分布式布拉格光栅滤波器的带通滤波窗口时，可以使中心波长在1530nm～1545nm内发生平移，在C波段前半部分进行激光调谐。
当用户在波长配置电路输入1550nm时，波长配置电路确定1550nm属于1545nm～1560nm(即C波段的后半部分)，通过配置马赫增德尔滤波器的干涉臂的相位差，将第一波段与1545nm～1560nm对准。这样1530nm～1545nm与马赫增德尔滤波器的一个带阻滤波窗口对应。波长调谐电路可以将分布式布拉格光栅滤波器的带通滤波窗口对应的中心波长调整至1550nm，从而输出波长为1550nm的激光。当波长调谐电路调谐分布式布拉格光栅滤波器的带通滤波窗口时，可以使中心波长在1545nm～1560nm内发生平移，在C波段后半部分进行激光调谐。
请参阅图11，本申请提供的可调谐激光器1100的另一个实施例包括：
增益模块1101、窄带梳状滤波器1102、正弦梳状滤波器1103、波长调谐电路1104和波长配置电路1105；
窄带梳状滤波器1102分别与增益模块1101、正弦梳状滤波器1103及波长调谐电路1104连接，波长配置电路1105与正弦梳状滤波器1103连接；
增益模块1101，用于在外部输入电流的控制下产生光信号；
窄带梳状滤波器1102具有相互间隔的带通滤波窗口，用于对增益模块1101产生的光信号进行滤波；
正弦梳状滤波器1103具有相互间隔的带通滤波窗口，用于对窄带梳状滤波器1102滤波后的光信号进行滤波，正弦梳状滤波器的自由光谱区不小于增益模块的增益谱的带宽；
波长配置电路1105用于接收波长信息，根据波长信息设置第一波段的位置，第一波段 为在目标波段上正弦梳状滤波器1103的带通滤波窗口对应的中心波段，目标波段为增益模块的增益谱对应的波段；
波长调谐电路1104用于调谐窄带梳状滤波器1102的带通滤波窗口，使第一波段和第二波段重叠，第二波段为在目标波段上窄带梳状滤波器1102的带通滤波窗口对应的波段。
其中，增益模块1101与图3所实施例中增益模块301相似，窄带梳状滤波器1102与图3所实施例中窄带梳状滤波器303相似，正弦梳状滤波器1103与图3所实施例中正弦梳状滤波器302相似，波长调谐电路1104与图3所实施例中波长调谐电路305相似，波长配置电路1105与图3所实施例中波长配置电路304相似，此处不再赘述。
需要说明的是，在目标波段上只有在第一波段和第二波段的重叠部分，能够形成单波峰光谱，输出单波长激光。波长处于目标波段的其他部分的激光受到抑制，无法从可调谐激光器1100输出。
当第一波段的带宽大于或等于窄带梳状滤波器1102的可调谐范围时，可调谐激光器1100的可调谐范围等于窄带梳状滤波器1102的可调谐范围。当第一波段的带宽小于窄带梳状滤波器的可调谐范围时，可调谐激光器1100的可调谐范围等于第一波段的带宽。
本实施例中，增益模块1101在外部注入电流的控制下产生光信号之后，窄带梳状滤波器1102对增益模块1101产生的光信号进行滤波，正弦梳状滤波器1103对窄带梳状滤波器1102滤波后的光信号进行滤波。当第一波段的中心波长和第二波段的中心波长均为λ3时，经过两个滤波器的滤波后得到的光信号增益曲线为单波峰光谱曲线，如图6所示。
在一个可选实施例中，窄带梳状滤波器为环形谐振腔滤波器。在正弦梳状滤波器1103对环形谐振腔滤波器滤波后的光信号进行滤波之后，由正弦梳状滤波器1103输出滤波后的光信号。
在另一个可选实施例中，可调谐激光器1100还包括与正弦梳状滤波器1103连接的反射模块，反射模块能够将正弦梳状滤波器1103滤波后的光信号反射回正弦梳状滤波器1103，光信号再返回至窄带梳状滤波器1102和增益模块1101，在增益模块1101、窄带梳状滤波器1102和正弦梳状滤波器1103形成的光谐振腔内来回振荡，最后从增益模块1101输出激光。
基于图11所示实施例，在一个可选实施例中，
第一波段的带宽等于增益谱对应的带宽的一半；
当波长信息对应的波长属于目标波段的前半部分时，波长配置电路1105具体用于将第一波段与目标波段的前半部分对准；当波长信息对应的波长属于目标波段的后半部分时，波长配置电路1105具体用于将第一波段与目标波段的后半部分对准。
本实施例中，波长配置电路1105设置第一波段的位置的过程与图2所示实施例的可选实施例中波长配置电路304设置第一波段的位置的过程相似。
基于前一实施例，在另一个可选实施例中，正弦梳状滤波器1103的FSR等于窄带梳状滤波器1102的FSR的两倍。
本实施例中，当正弦梳状滤波器1103有一个带通滤波窗口对应波段处于目标波段时，窄带梳状滤波器1102有两个带通滤波窗口对应的波段处于目标波段，分别记为波段A和波 段B。当第一波段和波段A在目标波段的前半部分重叠时，窄带梳状滤波器1102的带通滤波窗口与正弦梳状滤波器1103的带阻滤波窗口在目标波段的后半部分对准，则在目标波段的后半部分的光信号受到抑制。当第一波段和波段B在目标波段的后半部分重叠时，窄带梳状滤波器1102的带通滤波窗口与正弦梳状滤波器1103的带阻滤波窗口在目标波段的前半部分对准，则在目标波段的前半部分的光信号受到抑制。
基于图11所示实施例或可选实施例，在另一个可选实施例中，可调谐激光器1100还包括相位调整模块1201，如图12所示。相位调整模块1201分别与增益模块1101及窄带梳状滤波器1102连接。
本实施例中，相位调整模块1201可以是由平面光波导材料构成，例如InP、SOI或聚合物波导。相位调整模块1201对增益模块1101产生的光信号的相位进行调整，将相位调整后的光信号输送给窄带梳状滤波器1102。
需要说明的是，在以上实施例中，波长配置电路和波长调谐电路可以是独立的，也可以是集成在一个设备中。
以上所述，以上实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的精神和范围。

Claims (14)

  1. 一种可调谐激光器，其特征在于，包括：
    增益模块、正弦梳状滤波器、窄带梳状滤波器、波长配置电路和波长调谐电路，所述正弦梳状滤波器分别与所述增益模块、所述窄带梳状滤波器及所述波长配置电路连接，所述波长调谐电路与所述窄带梳状滤波器连接；
    所述增益模块，用于在外部输入电流的控制下产生光信号；
    所述正弦梳状滤波器具有相互间隔的带通滤波窗口，用于对所述增益模块产生的光信号进行滤波，所述正弦梳状滤波器的自由光谱区不小于所述增益模块的增益谱的带宽；
    所述窄带梳状滤波器具有相互间隔的带通滤波窗口，用于对所述正弦梳状滤波器滤波后的光信号进行滤波；
    所述波长配置电路用于接收波长信息，根据所述波长信息设置第一波段的位置，所述第一波段为在目标波段上所述正弦梳状滤波器的带通滤波窗口对应的中心波段，所述目标波段为所述增益模块的增益谱对应的波段；
    所述波长调谐电路用于调谐所述窄带梳状滤波器的带通滤波窗口，使所述第一波段和第二波段重叠，所述第二波段为在所述目标波段上所述窄带梳状滤波器的带通滤波窗口对应的波段。
  2. 根据权利要求1所述的可调谐激光器，其特征在于，
    当所述波长信息对应的波长属于所述目标波段的前半部分时，所述波长配置电路具体用于将所述第一波段与所述目标波段的前半部分对准；
    当所述波长信息对应的波长属于所述目标波段的后半部分时，所述波长配置电路具体用于将所述第一波段与所述目标波段的后半部分对准；
    其中，所述第一波段的带宽等于所述增益谱对应的带宽的一半。
  3. 根据权利要求2所述的可调谐激光器，其特征在于，所述正弦梳状滤波器的FSR等于所述窄带梳状滤波器的FSR的两倍。
  4. 根据权利要求1至3中任一项所述的可调谐激光器，其特征在于，所述正弦梳状滤波器为马赫增德尔滤波器或环形谐振腔滤波器，所述窄带梳状滤波器为分布式布拉格反馈滤波器或环形谐振腔滤波器。
  5. 根据权利要求1至3中任一项所述的可调谐激光器，其特征在于，所述正弦梳状滤波器的材料为磷化铟、绝缘体上的硅或聚合物波导，所述窄带梳状滤波器的材料为磷化铟、绝缘体上的硅或聚合物波导。
  6. 根据权利要求1至3中任一项所述的可调谐激光器，其特征在于，所述可调谐激光器还包括相位调整模块，所述相位调整模块分别与所述增益模块及所述正弦梳状滤波器连接。
  7. 根据权利要求6所述的可调谐激光器，其特征在于，所述相位调整模块的材料为磷化铟、绝缘体上的硅或聚合物波导。
  8. 一种可调谐激光器，其特征在于，包括：
    增益模块、窄带梳状滤波器、正弦梳状滤波器、波长调谐电路和波长配置电路，所述 窄带梳状滤波器分别与所述增益模块、所述正弦梳状滤波器及所述波长调谐电路连接，所述波长配置电路与所述正弦梳状滤波器连接；
    所述增益模块，用于在外部输入电流的控制下产生光信号；
    所述窄带梳状滤波器具有相互间隔的带通滤波窗口，用于对所述增益模块产生的光信号进行滤波；
    所述正弦梳状滤波器具有相互间隔的带通滤波窗口，用于对所述窄带梳状滤波器滤波后的光信号进行滤波，所述正弦梳状滤波器的自由光谱区不小于所述增益模块的增益谱的带宽；
    所述波长配置电路用于接收波长信息，根据所述波长信息设置第一波段的位置，所述第一波段为在目标波段上所述正弦梳状滤波器的带通滤波窗口对应的中心波段，所述目标波段为所述增益模块的增益谱对应的波段；
    所述波长调谐电路用于调谐所述窄带梳状滤波器的带通滤波窗口，使所述第一波段和第二波段重叠，所述第二波段为在所述目标波段上所述窄带梳状滤波器的带通滤波窗口对应的波段。
  9. 根据权利要求8所述的可调谐激光器，其特征在于，
    当所述波长信息对应的波长属于所述目标波段的前半部分时，所述波长配置电路具体用于将所述第一波段与所述目标波段的前半部分对准；
    当所述波长信息对应的波长属于所述目标波段的后半部分时，所述波长配置电路具体用于将所述第一波段与所述目标波段的后半部分对准；
    其中，所述第一波段的带宽等于所述增益谱对应的带宽的一半。
  10. 根据权利要求9所述的可调谐激光器，其特征在于，所述正弦梳状滤波器的FSR等于所述窄带梳状滤波器的FSR的两倍。
  11. 根据权利要求8至10中任一项所述的可调谐激光器，其特征在于，所述正弦梳状滤波器为马赫增德尔滤波器或环形谐振腔滤波器，所述窄带梳状滤波器为分布式布拉格反馈滤波器或环形谐振腔滤波器。
  12. 根据权利要求8至10中任一项所述的可调谐激光器，其特征在于，所述正弦梳状滤波器的材料为磷化铟、绝缘体上的硅或聚合物波导，所述窄带梳状滤波器的材料为磷化铟、绝缘体上的硅或聚合物波导。
  13. 根据权利要求8至10中任一项所述的可调谐激光器，其特征在于，所述可调谐激光器还包括相位调整模块，所述相位调整模块分别与所述增益模块及所述窄带梳状滤波器连接。
  14. 根据权利要求13所述的可调谐激光器，其特征在于，所述相位调整模块的材料为磷化铟、绝缘体上的硅或聚合物波导。
PCT/CN2017/083052 2017-05-04 2017-05-04 一种可调谐激光器 WO2018201393A1 (zh)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201780090001.1A CN110546834B (zh) 2017-05-04 2017-05-04 一种可调谐激光器
PCT/CN2017/083052 WO2018201393A1 (zh) 2017-05-04 2017-05-04 一种可调谐激光器

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2017/083052 WO2018201393A1 (zh) 2017-05-04 2017-05-04 一种可调谐激光器

Publications (1)

Publication Number Publication Date
WO2018201393A1 true WO2018201393A1 (zh) 2018-11-08

Family

ID=64016447

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2017/083052 WO2018201393A1 (zh) 2017-05-04 2017-05-04 一种可调谐激光器

Country Status (2)

Country Link
CN (1) CN110546834B (zh)
WO (1) WO2018201393A1 (zh)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6526071B1 (en) * 1998-10-16 2003-02-25 New Focus, Inc. Tunable laser transmitter with internal wavelength grid generators
CN1524327A (zh) * 2001-07-06 2004-08-25 英特尔公司 可调谐激光器控制系统
CN101626141A (zh) * 2009-08-06 2010-01-13 浙江大学 基于组合型调谐滤波器的全光纤快速扫频激光光源
CN102244358A (zh) * 2011-06-02 2011-11-16 天津奇谱光电技术有限公司 一种外腔式可调谐激光器
CN102751656A (zh) * 2012-07-19 2012-10-24 武汉光迅科技股份有限公司 可调激光器边模抑制比及通道稳定性监控系统及监控方法
CN104821485A (zh) * 2014-02-05 2015-08-05 华为技术有限公司 激光设备和在该设备中生成激光模式的方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6526071B1 (en) * 1998-10-16 2003-02-25 New Focus, Inc. Tunable laser transmitter with internal wavelength grid generators
CN1524327A (zh) * 2001-07-06 2004-08-25 英特尔公司 可调谐激光器控制系统
CN101626141A (zh) * 2009-08-06 2010-01-13 浙江大学 基于组合型调谐滤波器的全光纤快速扫频激光光源
CN102244358A (zh) * 2011-06-02 2011-11-16 天津奇谱光电技术有限公司 一种外腔式可调谐激光器
CN102751656A (zh) * 2012-07-19 2012-10-24 武汉光迅科技股份有限公司 可调激光器边模抑制比及通道稳定性监控系统及监控方法
CN104821485A (zh) * 2014-02-05 2015-08-05 华为技术有限公司 激光设备和在该设备中生成激光模式的方法

Also Published As

Publication number Publication date
CN110546834A (zh) 2019-12-06
CN110546834B (zh) 2021-05-18

Similar Documents

Publication Publication Date Title
US10256606B2 (en) Wavelength-tunable external-cavity laser and adjustable light emission module
US9496961B2 (en) External cavity laser based wavelength division multiplexing superchannel transceivers
US6091744A (en) Wavelength selectable source for wavelength division multiplexed applications
US6959028B2 (en) External cavity, widely tunable lasers and methods of tuning the same
US9436022B2 (en) Modulated light source
US20020054614A1 (en) Wavelength discretely tunable semiconductor laser
JP6801395B2 (ja) 多波長レーザ装置及び波長多重通信システム
JP7077525B2 (ja) 波長可変光源、及びこれを用いた光トランシーバ
US8902937B2 (en) Compact external cavity tunable laser apparatus
JP2005340359A (ja) 波長可変レーザ装置
US9966724B2 (en) Laser and method of controlling laser
KR102193981B1 (ko) 외부 공진기형 레이저의 제어 방법 및 제어 장치
US9397746B1 (en) Tuning external cavity lasers within CWDM transmitters for temperature insensitivity and superchannel construction
US20090086774A1 (en) Control device, laser device, wavelength converting method, and program
WO2017128214A1 (zh) 波长可调谐的光发射装置
US8995480B2 (en) Tunable laser module
WO2018201393A1 (zh) 一种可调谐激光器
JP2017527130A (ja) 波長可変レーザ及びレーザ発振モードを調整する方法
US7031619B2 (en) Method and system for dispersion control of electromagnetic signals in communication networks
KR101781411B1 (ko) 파장 가변 광원 구현 방법 및 장치
JP4234065B2 (ja) 多チャンネル光送信装置
CN113853755A (zh) 一种多波长光源以及光芯片
JP2016528733A (ja) 光学ソース
JPH10321938A (ja) 周波数安定化光源
KR20170098521A (ko) 파장가변 레이저 장치 및 그의 구동방법

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17908749

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 17908749

Country of ref document: EP

Kind code of ref document: A1