CN108153000A - A kind of spectral line interval is equal to the frequency comb generator of optical fiber Brillouin frequency displacement - Google Patents
A kind of spectral line interval is equal to the frequency comb generator of optical fiber Brillouin frequency displacement Download PDFInfo
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- CN108153000A CN108153000A CN201810007537.9A CN201810007537A CN108153000A CN 108153000 A CN108153000 A CN 108153000A CN 201810007537 A CN201810007537 A CN 201810007537A CN 108153000 A CN108153000 A CN 108153000A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 31
- 230000003595 spectral effect Effects 0.000 title claims abstract description 17
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 12
- 230000003287 optical effect Effects 0.000 claims description 13
- 230000005611 electricity Effects 0.000 claims 1
- 230000010363 phase shift Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 12
- 230000010355 oscillation Effects 0.000 abstract description 6
- 230000005622 photoelectricity Effects 0.000 abstract description 2
- 230000003321 amplification Effects 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 210000001520 comb Anatomy 0.000 description 3
- 230000035559 beat frequency Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000009022 nonlinear effect Effects 0.000 description 2
- 230000005693 optoelectronics Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
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- 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
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
- H01S3/302—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects in an optical fibre
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/03—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
- G02F1/035—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect in an optical waveguide structure
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Plasma & Fusion (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses a kind of frequency comb generating means based on stimulated Brillouin scattering and Electro-optical Modulation, it forms feedback control loop using continuous-wave laser, electro-optic phase modulator, optical fiber, photodetector and radio frequency amplifier, generate the radiofrequency signal that frequency of oscillation is equal to optical fiber Brillouin frequency displacement, utilize another electrooptic modulator of this radio frequency signals drive, generate the frequency comb that spectral line interval is equal to optical fiber Brillouin frequency displacement, by adjusting the operation wavelength of laser or the interval of frequency comb spectral line can be changed using the optical fiber with different Brillouin shifts.With it is existing the method for frequency comb is generated based on Electro-optical Modulation compared with, the present invention drives modulator without applied radio frequency signal, thus with higher stability and lower phase noise, and is easier realization photoelectricity and integrates.
Description
Technical field
It is the common method for generating frequency comb using radiofrequency signal Electro-optical Modulation continuous laser, the realization of this method need to be outer
Add radio frequency source.The present invention relates to a kind of frequency comb generating means based on stimulated Brillouin scattering and Electro-optical Modulation, utilize company
Continuous wave laser, electro-optic phase modulator, optical fiber, Photoelectric Detection and radio frequency amplifier form oscillating loop, generate frequency and are equal to
The oscillation mode of optical fiber Brillouin frequency displacement drives another electrooptic modulator to generate frequency comb using this signal.Therefore, nothing of the present invention
Applied radio frequency signal is needed, and frequency can be generated simultaneously and be equal to this for the radiofrequency signal of optical fiber Brillouin frequency displacement and spectral line interval
The frequency comb of frequency, generating the bandwidth of frequency comb can also be expanded by cascade electrooptic modulator.The invention belongs to microwaves
The technical field of optical-electronic oscillator and frequency comb generator in photonics.
Background technology
In recent years, due to frequency comb have in fields such as space navigation, optical precision measurement, random waveform generations it is extensive
Application prospect, the generation of frequency comb have become one of the research hotspot in Microwave photonics field.Existing optical frequency comb generation method
It is broadly divided into three kinds.The first is the method based on mode-locked laser, and this method needs to build complicated resonator, and export
Spectrum is easily influenced by the loss and dispersion of the waveguide mediums such as ambient temperature and optical fiber.Second is to utilize non-linear effect in optical fiber
The method answered, the spectral line quantity that the method generates is more, but the nonlinear effect in excitation fiber needs higher luminous power, and
The frequency comb adjustability of generation is not high.The third is the method based on electrooptic modulator, and this method has adjustability good, stablizes
High outstanding advantages are spent, are current most common optical frequency comb generation methods.For example, the company sent out using radiofrequency signal to laser
Continuous light carries out phase-modulator, can generate the frequency comb being made of multiple modulation sideband,s.(bibliography [1]：J.Zhang,
J.Yu, N.Chi, Z.Dong, X.Li, Y.Shao, J.Yu, and L.Tao, " Flattened comb generation using
only phase modulators driven by fundamental frequency sinusoidal sources with
Small frequency offset, " Opt.Lett.38 (4), pp.552-554,2013).By cascading two intensity modulateds
Device and a phase-modulator drive modulator with the microwave signal of 10GHz, in 1dB flatnesses, can obtain comprising 38 spectrums
Frequency comb (the bibliography [2] of line：R.Wu, V.R.Supradeepa, C.M.Long, D.E.Leaird, and
A.M.Weiner, " Generation of very flat optical frequency combs from continuous-
wave lasers using cascaded intensity and phase modulators driven by tailored
Radio frequency waveforms, " Opt.Lett.35 (19), pp.3234-3236,2010).In addition, pass through setting two
The operating point of a cascade intensity modulator, can also design and realize spectral line interval and the adjustable frequency comb generator of quantity.(reference
Document [3]：X.Zou, W.Pan, and J.Yao, " Tunable optical comb generation based on
Carrier-suppressed intensity modulation and phase modulation, " Chin.Opt.Lett.8
(5), pp.468-470,2010).
All can obtain flat frequency comb although with the above-mentioned method based on electrooptic modulator, but be required for high-performance,
The microwave signal source of low noise provides drive signal, in this way, it is not only of high cost, but also noise can be introduced, deteriorate generated light
Frequency combs the phase noise performance of spectral line.Optical-electronic oscillator has Q values height, frequency stabilization, phase compared with conventional radio frequency signal source
The advantages that noise is low and small (bibliography [4]：Huanfa Peng, Cheng Zhang, Xiaopeng Xie, Tao
Sun, Peng Guo, Xiaoqi Zhu, Lixin Zhu, Weiwei Hu, and Zhangyuan Chen, " Tunable DC-
60GHz RF Generation Utilizing a Dual-Loop Optoelectronic Oscillator Based on
Stimulated Brillouin Scattering. " J.Lightwave Technol., 33 (13), pp.2707-2715,
2015).In addition, traditional microwave signal source driving electrooptic modulator is replaced to generate frequency comb with optical-electronic oscillator, it is easier to realize
The frequency comb generator for the miniaturization that photoelectricity integrates.The present invention utilizes the stimulated Brillouin scattering in optical fiber for case above
Effect and phase-modulator generate optoelectronic oscillation, and the frequency comb for realizing a kind of spectral line interval equal to optical fiber Brillouin frequency displacement occurs
Device.
Invention content
The invention discloses a kind of optical frequencies for being equal to optical fiber Brillouin frequency displacement without additional microwave signal source and spectral line interval
Comb generator.Specifically, the structure of frequency comb generator according to the present invention is as shown in Figure 1.In figure, continuous-wave laser
(1) laser of output is divided into two branches through photo-coupler (2), and the light of lower branch passes through circulator after image intensifer (3) amplification
(4) reversely in input optical fibre (5), the stimulated Brillouin scattering in excitation fiber (5).Upper branch light passes through electro-optic phase modulator
(6) ± 1 rank modulation sideband, is generated.When -1 rank sideband of flashlight is located at the gain bandwidth of the stimulated Brillouin scattering of optical fiber (5)
When interior, this sideband will be amplified.+ 1 rank sideband, amplified -1 rank sideband and carrier wave are input to photo-coupler through circulator (4)
(7) it is divided into two-way, wherein light is sent into photodetector (8) and carries out light-to-current inversion all the way, during this, after+1 rank sideband and amplification
- 1 rank sideband obtained respectively with light carrier beat frequency frequency be equal to optical fiber (5) Brillouin shift microwave signal, this signal is through penetrating
It after audio amplifier (9) amplification, is input to RF Power Splitter (10) and is divided into two branches, wherein feedback driving phase-modulator all the way
(6), oscillating loop is formed.Another way radiofrequency signal is divided into two-way again by RF Power Splitter (11), wherein directly defeated all the way
Go out, radio-frequency signal source or system detectio signal can be used as；Another way is through radio-frequency phase shifter (12), radio frequency amplifier (13) and adjustable
The another way laser that radio frequency attenuator (14) drives electrooptic modulator (15) to export coupler (7) afterwards is modulated, and generates light
Frequency is combed, and adjusts radio-frequency phase shifter (12) and adjustable radio frequency attenuator (14) can obtain flat frequency comb.
The present invention has the following advantages：
1st, the present invention generates frequency comb using from driving cascade electrooptic modulator, compared with conventional method, does not need to from outer
Portion's input radio frequency signal driving modulator, thus with higher stability and lower phase noise, and be easier to realize light
It is electrically integrated.
2nd, the frequency comb spectral line interval that the present invention realizes is equal to the Brillouin shift of optical fiber (5).Therefore, it is continuous by adjusting
The output wavelength of wave laser (1) uses the optical fiber (5) with different Brillouin shifts, between can be changed between frequency comb spectral line
Every.
3rd, the output of RF Power Splitter (11) wherein all the way can be used as radio-frequency signal source, output frequency interval etc. in the present invention
In the strength of optical fiber (5) Brillouin shift, by adjusting the output wavelength of continuous-wave laser (1) or using with difference
The optical fiber (5) of Brillouin shift, the rf oscillation signal of exportable different frequency.
4th, scheme provided by the invention also has good expansibility, can also be cascaded after phase-modulator (15)
Multiple electro-optic intensities or phase-modulator, and cascade electric light will be driven after the output signal of RF Power Splitter (11) again work(point
Modulator, so as to export the flat frequency comb for including more multiline.
Description of the drawings
Fig. 1：The installation drawing of optical frequency comb generator designed by the present invention.
Fig. 2：Test the obtained spectrogram for including 9 flat frequency combs.
Fig. 3：Test the obtained spectrogram of oscillator signal.
Fig. 4：Test the obtained phase noise performance figure of oscillator signal.
Specific embodiment
The scheme of optical frequency generator proposed by the invention, by being verified, experimental provision such as Fig. 1 institutes
Show, experimentation and result are described with reference to the drawings as follows.
As shown in Figure 1, the operation wavelength of setting Continuous Wave Tunable laser is 1550.2nm in experiment, output power is
14dBm, the output light of this laser are divided into two-way through three-dB coupler, and lower road light is amplified, and pass through by erbium-doped fiber amplifier
2 mouthfuls of circulator are redirected back into the non-zero dispersion displacement optical fiber that length is 2km, and amplifier output power 12dBm is non-to excite
Stimulated Brillouin scattering effect in zero dispersion shift fiber.When -1 rank sideband of phase-modulator output is located at excited Brillouin
When in the gain bandwidth of scattering, this sideband will be amplified.The light of optical fiber output is input to 10 through circulator：90 couplers are divided into two
Road, wherein, splitting ratio be 90% all the way through photodetector carry out light-to-current inversion, at this point ,+1 rank sideband and amplified -1
Rank sideband with carrier wave beat frequency, generates the beat signal that frequency is equal to optical fiber Brillouin frequency displacement, then by amplification, feeds back to respectively
Loop oscillation is completed in phase-modulator.Oscillator signal driving next stage electro-optic phase modulator after stabilization.It is penetrated by adjusting
Frequency phase shifter, variable radio frequency attenuator finally obtained the optical frequency com for including 9 spectral lines in three dB bandwidth, as shown in Figure 2.
The interval of wherein spectral line is equal to the frequency of oscillator signal, and frequency of oscillation is equal to the Brillouin shift of non-zero dispersion displacement optical fiber,
It is 10.67GHz to test the result measured, as shown in Figure 3.Finally, the single-side belt of oscillator signal is measured using signal analyzer
Phase noise, as shown in figure 4, the phase noise at 10kHz frequency deviations is -85.0dBc/Hz.
Therefore, pass through the feasibility of experimental verification the invention.
In conclusion invention achieves expected purposes.
Claims (4)
1. a kind of spectral line interval is equal to the frequency comb generator of optical fiber Brillouin frequency displacement, which is characterized in that frequency comb generator packet
Include following device：The light of continuous-wave laser (1) output is divided into two branches through photo-coupler (2), and lower branch light is by image intensifer
(3) optical fiber (5) is reversely input to through circulator (4) again after amplifying, electro-optic phase modulator (6) carries out phase tune to upper branch light
System, modulated optical signal is divided into two-way after optical fiber (5) and optical circulator (4) are input to photo-coupler (7), wherein light all the way
Light-to-current inversion is carried out through photodetector (8), after the electric signal of output is amplified by radio frequency amplifier (9), through RF Power Splitter
(10) it is divided into two-way, wherein feeding back to electro-optic phase modulator (6) all the way, another way is divided into two by RF Power Splitter (11) again
Road directly exports all the way, and another way is through radio-frequency phase shifter (12), radio frequency amplifier (13) and adjustable radio frequency attenuator (14) rear-guard
Dynamic electrooptic modulator (15) is modulated the another way optical signal of photo-coupler (7) output, so as to generate frequency comb.
2. frequency comb generator described in claim 1, which is characterized in that do not need to external input radio frequency signals drive electric light phase
Position modulator, and drive signal is provided by the optical-electronic oscillator that inner feedback loop is formed, the composition of this oscillator is included continuously
Wave laser (1), photo-coupler (2), image intensifer (3), optical circulator (4), optical fiber (5), electro-optic phase modulator (6), light
Coupler (7), photodetector (8), radio frequency amplifier (9) and RF Power Splitter (10).
3. frequency comb generator described in claim 1, which is characterized in that the frequency comb spectral line interval generated is equal to interior lights
Electricity shakes the frequency of signal, this frequency is equal to the Brillouin shift of optical fiber (5), by the operating wave for adjusting continuous-wave laser (1)
Length uses the optical fiber (5) with different Brillouin shifts, and the spectral line interval of output frequency comb can be changed.
4. frequency comb generator described in claim 1, which is characterized in that can be cascaded multiple after electrooptic modulator (15)
Electro-optic intensity or phase-modulator, and it is new by being driven after the output of RF Power Splitter (11) again work(point, phase shift and power adjustment
Cascade modulator, the thus exportable flat frequency comb for including more multiline.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110518982A (en) * | 2019-07-15 | 2019-11-29 | 上海交通大学 | The method that cascade intensity modulator generates flat frequency comb and nyquist pulse |
| CN110707510A (en) * | 2018-07-09 | 2020-01-17 | 中国科学院半导体研究所 | Fourier domain mode-locked photoelectric oscillator based on stimulated Brillouin scattering |
| CN110911946A (en) * | 2019-11-28 | 2020-03-24 | 天津大学 | Comb-distance-adjustable low-phase-noise microwave frequency comb generator |
| CN111901042A (en) * | 2020-08-11 | 2020-11-06 | 中国电子科技集团公司第四十四研究所 | Phase modulation-based large dynamic signal demodulation model method |
| CN113568240A (en) * | 2021-07-02 | 2021-10-29 | 四川橙科通信技术研究院有限责任公司 | Optical frequency comb generation method and device for phase modulation and stimulated Brillouin scattering |
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| CN103941515A (en) * | 2014-04-09 | 2014-07-23 | 上海交通大学 | Optical frequency comb generation device and method with comb tooth frequency interval capable of being scanned |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110707510A (en) * | 2018-07-09 | 2020-01-17 | 中国科学院半导体研究所 | Fourier domain mode-locked photoelectric oscillator based on stimulated Brillouin scattering |
| CN110518982A (en) * | 2019-07-15 | 2019-11-29 | 上海交通大学 | The method that cascade intensity modulator generates flat frequency comb and nyquist pulse |
| CN110911946A (en) * | 2019-11-28 | 2020-03-24 | 天津大学 | Comb-distance-adjustable low-phase-noise microwave frequency comb generator |
| CN111901042A (en) * | 2020-08-11 | 2020-11-06 | 中国电子科技集团公司第四十四研究所 | Phase modulation-based large dynamic signal demodulation model method |
| CN113568240A (en) * | 2021-07-02 | 2021-10-29 | 四川橙科通信技术研究院有限责任公司 | Optical frequency comb generation method and device for phase modulation and stimulated Brillouin scattering |
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