CN110277724A - A kind of adjustable high repetition frequency single-chamber bicoherence optical frequency com light source - Google Patents
A kind of adjustable high repetition frequency single-chamber bicoherence optical frequency com light source Download PDFInfo
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- CN110277724A CN110277724A CN201910554120.9A CN201910554120A CN110277724A CN 110277724 A CN110277724 A CN 110277724A CN 201910554120 A CN201910554120 A CN 201910554120A CN 110277724 A CN110277724 A CN 110277724A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2746—Optical coupling means with polarisation selective and adjusting means comprising non-reciprocal devices, e.g. isolators, FRM, circulators, quasi-isolators
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
- G02B6/2861—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using fibre optic delay lines and optical elements associated with them, e.g. for use in signal processing, e.g. filtering
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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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06791—Fibre ring lasers
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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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
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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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
- H01S3/1112—Passive mode locking
- H01S3/1115—Passive mode locking using intracavity saturable absorbers
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Abstract
The present invention relates to a kind of adjustable high repetition frequency single-chamber bicoherence optical frequency com light sources.The comb light source includes the double light comb structures of single-chamber being made of the first pump laser, the second pump laser, the first wavelength division multiplexer, the second wavelength division multiplexer, Er-doped fiber, Polarization Controller, the first optical coupler, the first isolator, the second optical coupler and the second isolator and four port circulators, the first tunable optical filter, the second tunable optical filter；By on the basis of single-chamber double light combs, increase four port circulators, the first tunable optical filter, the second tunable optical filter, it is greatly improved the repetition rate of the double light combs of single-chamber, promote its repetition rate to 10GHz or more from several 10MHz magnitudes, improve the double light comb repetition rate controllabilitys of single-chamber simultaneously, make its from it is initial it is non-adjustable increase to it is adjustable in GHz range.
Description
Technical field
The present invention relates to optical fiber laser, optical frequency com and microwave photon channelization technique fields, in particular to a kind of
Adjustable high repetition frequency single-chamber bicoherence optical frequency com light source.
Background technique
Microwave photon signal processing technology based on double optics frequency comb overcomes that conditional electronic technology frequency band is narrow and photon
The low disadvantage of technology frequency resolution realizes organically blending for electronic technology and photon technology, is that current Microwave photonics are ground
Study carefully one of hot spot.
Bicoherence optical frequency com is the frequency comb with certain Free Spectral Range difference of two PGC demodulations.2012
Year, Xie et al. demonstrates the microwave photon channelizing system based on double optics frequency comb, realizes bandwidth 3.5GHz microwave signal
Digital Channelized Receiving[1]。
2015, the method Vahid et al. based on bicoherence optical frequency com signal processing, which is realized, believed instantaneous wideband
Number high-gain detection[2]。
In order to overcome the limitation of electronic technology transceiving band, 2017, Pan et al. devised a kind of based on relevant frequency comb
Microwave photon transceiver, the microwave signal of big bandwidth and Larger Dynamic range transmitting-receiving in real time may be implemented[3]。
2018, Esman, which is based on adjustable coherent optics frequency comb, realized a variety of wide-band microwave signal processing functions, showed
The great application prospect of double light combs is gone out[4]。
The method of cascade phase and intensity modulator has been all made of in use above as generation bicoherence optical frequency com
Light source.The benefit applied in this way is to can produce stable bicoherence optical frequency com.But the frequency that this method can be generated
Rate comb comb teeth quantity is extremely limited, in tens of comb teeth magnitudes.In order to solve this problem Vahid et al. using Electro-optical Modulation with
The method of nonlinear optical fiber spectrum widening obtains wider frequency comb spectrum.But this method is still needed using cascade electricity
Spectrum seed source of the optical modulator as prime.And electrooptic modulator cost and the high-frequency microwave signal source cost for driving
It is very high, it limits it and further applies.
Other than using Electro-optical Modulation scheme is cascaded, generating frequency comb using mode-locked laser is that another is more normal
Scheme.The advantages of mode-locked laser has structure simple, and cost is relatively low and spectral width.Double light based on double mode-locked laser
Comb system is in spectral measurement[5]It is imaged with precision[6]Field technology maturation, is widely used.Meanwhile the double optical comb technologies of single-chamber can be by
One mode locked fiber laser generates two optical frequency coms simultaneously, avoids the need for building asking for two mode-locked lasers respectively
Topic, further simplifies system structure, and its difference on the frequency is highly stable, can be used so that system performance is further promoted[7]。
Therefore, replace Electro-optical Modulation technology as microwave light according to the double optical comb technologies of single-chamber in mode locked fiber laser
System bulk, complexity and cost can be greatly reduced in the signal optical source of subsystem.With electronics such as high-speed communication and radars
The development of technology, the microwave signal bandwidth of required processing is in GHz magnitude.In order to handle double light comb weights needed for wide-band microwave signal
Complex frequency is in 10GHz or more, and the difference on the frequency of double frequency combs is in GHz magnitude, and difference on the frequency needs are adjustable in GHz magnitude.But
Currently based on double its repetition rate of the light source of optical comb technology of single-chamber only in several 10MHz magnitudes, and double frequency comb difference on the frequencies exist
The demand proposed for microwave signal process is much not achieved in Hz-KHz magnitude.
Bibliography cited above is as follows:
【1】Xie,Xiaojun,et al."Broadband photonic RF channelization based on
coherent optical frequency combs and I/Qdemodulators."IEEE Photonics Journal
4.4(2012):1196-1202.
【2】Ataie,Vahid,et al."Subnoise detection of a fast random event."
Science 350.6266(2015):1343-1346.
[3] a kind of microwave photon transceiver based on relevant frequency comb of Pan Shilong, Tang Zhenzhou, Zhu Dan, China,
CN201710287741.6.
【4】Esman,Daniel.Tunable Optical Frequency Comb Assisted Radio
Frequency Receiver.Diss.UC San Diego,2017.
【5】Okubo,Sho,et al."Ultra-broadband dual-comb spectroscopy across
1.0–1.9μm."Applied Physics Express 8.8(2015):082402.
【6】Wang,Chao,et al."Line-scan spectrum-encoded imaging by dual-comb
interferometry."Optics letters 43.7(2018):1606-1609.
【7】Olson,J.,et al."Bi-Directional Mode-Locked Thulium Fiber Laser as
a Single-Cavity Dual-Comb Source."IEEE Photonics Technology Letters 30.20
(2018):1772-1775.
Summary of the invention
In order to overcome, the single-chamber double optics frequency comb repetition rate based on optical fiber mode locked laser is low, difference on the frequency is small and frequency
Adjustability is insufficient and the problem of microwave photon double light comb signal processings can not be applied to, the present invention provides a kind of repetitions of adjustable height
Frequency single-chamber bicoherence optical frequency com light source, while reducing microwave photon signal processing system volume, cost and complexity.
The specific technical solution of the present invention is:
The present invention provides a kind of adjustable high repetition frequency single-chamber bicoherence optical frequency com light sources, including the first pumping to swash
Light device, the second pump laser, the first wavelength division multiplexer, the second wavelength division multiplexer, Er-doped fiber, Polarization Controller, the first light
Learn coupler, the first isolator, four port circulators, the first tunable optical filter, the second tunable optical filter, the second optics coupling
Clutch and the second isolator；
First pump laser is connect by the first wavelength division multiplexer with Er-doped fiber；
First wavelength division multiplexer is connect by Polarization Controller with the first optical coupler；
The a port of first optical coupler is exported outward by the first isolator, another port and four ports annular
The first port of device connects；
The second port of four port circulators connects the first tunable optical filter；
Second pump laser is connect by the second wavelength division multiplexer with Er-doped fiber；
Second wavelength division multiplexer is connect with the second optical coupler；
The a port of second optical coupler is exported outward by the second isolator, another port and four ports annular
The third port of device connects；
4th port of four port circulators connects the second tunable optical filter；
First tunable optical filter and the second tunable optical filter are identical, are respectively used to generate between peri odic spectrum
Every frequency comb.
Further, first tunable optical filter includes third optical coupler, the first adjustable light delay, the 4th
Optical coupler, the first saturable absorber reflecting mirror and the first optical fiber；
The input terminal of third optical coupler is connect with the second port of four port circulators, third optical coupler it is defeated
Outlet is two, and an output end is connect by the first adjustable light delay with the input terminal of the 4th optical coupler, the other end
Output end is directly connect with the input terminal of the 4th optical coupler, the output end and the first saturable absorption of the 4th optical coupler
The connection of body reflecting mirror；
Second tunable optical filter includes the 5th optical coupler, the second adjustable light delay, the 6th optical coupled
Device, the second saturable absorber reflecting mirror and the second optical fiber；
The input terminal of 5th optical coupler is connect with the 4th port of four port circulators, the 5th optical coupler it is defeated
Outlet is two, and an output end is connect by the second adjustable light delay with the input terminal of the 6th optical coupler, the other end
Output end is directly connect with the input terminal of the 6th optical coupler, the output end and the second saturable absorption of the 6th optical coupler
The connection of body reflecting mirror.
Further, the light with peri odic spectrum interval that the first tunable optical filter and the second tunable optical filter generate
Frequency combs the calculation formula of FSR are as follows:
Wherein, c is the light velocity；
Δ L is optical path difference between the first adjustable light delay and the first optical fiber or is the second adjustable light delay and
Optical path difference between two optical fiber.
Further, the splitting ratio of above-mentioned first optical coupler and the second optical coupler is 10:90.
Further, the splitting ratio of third optical coupler and the 5th optical coupler is 50:50.
Beneficial effects of the present invention:
1, the present invention increases four port circulators, the first tunable optical filter, second on the basis of single-chamber double light combs
Tunable optical filter is greatly improved the repetition rate of the double light combs of single-chamber, make its repetition rate from several 10MHz magnitudes promoted to
10GHz or more.
2, by the present invention in that being delayed with the first tunable optical in the first tunable optical filter and the second tunable optical filter
Device and the second adjustable light delay improve the double light comb repetition rate controllabilitys of single-chamber, make it from initial non-adjustable increase
It is adjustable in GHz range.
3, double light combs may be implemented by separately adjustable first tunable optical filter and the second tunable optical filter in the present invention
The adjusting of difference on the frequency.
4, realization of the present invention to the controllability of the promotion and difference on the frequency of the double light comb repetition rates of single-chamber and difference on the frequency
So that it meets the requirement for microwave photon signal processing, system can be significantly reduced instead of existing system electrooptic modulator
Volume, cost and complexity, and promote the spectral region of light source.
Detailed description of the invention
Fig. 1 is the double light comb schematic diagrams of typical single-chamber.
Fig. 2 is adjustable high repetition frequency single-chamber bicoherence optical frequency com light-source structure schematic diagram.
Specific embodiment
The present invention is further explained with reference to the accompanying drawing:
Since the double optical comb technologies of single-chamber are core of the invention, therefore at this to the double optical comb technology structural principles of typical single-chamber
It is illustrated.A kind of double light comb structures of common single-chamber are as shown in Figure 1.Pump the laser warp of light laser (LD1 and LD2) outgoing
Cross wavelength division multiplexer (WDM1 and WDM2) feed-in Er-doped fiber (EDF), generate wide range fluorescence, wide range fluorescence as seed light along
Optical fiber transmits clockwise and anticlockwise.Saturable absorber (SA) carries out Nonlinear Adjustment to different spectral intensities, passes through tune
Section Polarization Controller (Polarization Controller, PC) can make laser works in mode-lock status, generate more waves
Long output.Wherein the light of clockwise transmission from the light of counterclockwise transmission since Sagnac effect causes its equivalent optical path different,
And then cause its repetition rate different, different biographies can be made by using optical coupler (OC) and isolator (ISO1 and ISO2)
The light in defeated direction is exported from two ports respectively, and then obtains the laser of two different repetition rates.Since two laser transmit
Path height overlapping, repetition rate can synchronize variation under the influence of external environment, but difference on the frequency be able to maintain it is relatively stable.
Based on the above-mentioned explanation to typical single-chamber double light comb structures and working principle, below to disclosed by the invention adjustable
The structure and working principle of high repetition frequency single-chamber bicoherence optical frequency com light source describe in detail:
As shown in Fig. 2, a kind of structure of adjustable high repetition frequency single-chamber bicoherence optical frequency com light source includes: the first pump
Pu laser LD1, the second pump laser LD2, the first wavelength division multiplexer WDM1, the second wavelength division multiplexer WDM2, Er-doped fiber
EDF, Polarization Controller PC, the first optical coupler OC1, the first isolator ISO1, four port circulators are (i.e. in figure
Circulator is hereafter unified for four port circulators), the first tunable optical filter, the second tunable optical filter, the second optics
Coupler OC2 and the second isolator ISO2；
Wherein, the first tunable optical filter, the second tunable optical filter structure are identical, and being respectively used to generate has period frequency
Compose the frequency comb at interval.
A kind of implementation structure of the first tunable optical filter and the second tunable optical filter is provided in this example, but is not limited only to
The structure, as long as other structures are able to satisfy the frequency comb for generating and having peri odic spectrum interval.
First tunable optical filter includes third optical coupler OC3, the first adjustable light delay OTDL1, the 4th optics
Coupler OC4, the first saturable absorber reflecting mirror SAM1 and the first optical fiber；
Second tunable optical filter includes the 5th optical coupler OC5, the second adjustable light delay OTDL2, the 6th optics
Coupler OC6, the second saturable absorber reflecting mirror SAM2 and the second optical fiber；
First pump laser LD1 is connect by the first wavelength division multiplexer WDM1 with Er-doped fiber EDF；
First wavelength division multiplexer WDM1 is connect by Polarization Controller PC with the first optical coupler OC1；
First optical coupler OC1 splitting ratio is 10:90, and a port of the first optical coupler passes through the first isolator
ISO1 is exported outward, another port is connected with the first port of four port circulators；
The input terminal of the second port connection third optical coupler OC3 of four port circulators, third optical coupler OC3
Output end be two (splitting ratio 50:50), output end passes through the first adjustable light delay OTDL1 and the 4th optics coupling
The input terminal of clutch OC4 connects, and other end output end is directly connect with the input terminal of the 4th optical coupler OC4, the 4th optics
The output end of coupler OC4 is connect with the first saturable absorber reflecting mirror SAM1；
Second pump laser LD2 is connect by the second wavelength division multiplexer WDM2 with Er-doped fiber EDF；
Second wavelength division multiplexer WDM2 is connect with the second optical coupler OC2；
Second optical coupler OC2 splitting ratio is 10:90, a port of the second optical coupler OC2 by second every
It is exported outward from device ISO2, another port is connected with the third port of four port circulators；
4th port of four port circulators connects the 5th optical coupler OC5, the output end of the 5th optical coupler OC5
It is two (splitting ratio 50:50), an output end passes through the second adjustable light delay OTDL2 and the 6th optical coupler OC6
Input terminal connection, other end output end directly connect with the input terminal of the 6th optical coupler OC6, the 6th optical coupler
The output end of OC6 is connect with the second saturable absorber reflecting mirror SAM1.
The working principle of the device is illustrated below:
First pump laser LD1, the second pump laser LD2 generate two beams about 0.4W, and the pumping laser of 980nm passes through
The the first wavelength division multiplexer WDM1 and the second wavelength division multiplexer WDM2 of 980/1550nm is synchronized and is fed into Er-doped fiber EDF, is adopted
Pump power can be increased with two pump lasers while guaranteeing the consistency of transmitted in both directions laser intensity.
Pump light forms wavelength in the wide range fluorescence of 1530nm to 1610nm by Er-doped fiber EDF.Wide range fluorescence difference
It is transmitted along both direction clockwise and anticlockwise.In order to further illustrate the difference of loop clockwise and loop counterclockwise, under
Face is respectively illustrated both direction mode-locked laser rotation direction.
Clockwise, using the first optical coupler OC1 as starting point, laser signal passes through Polarization Controller PC in optical fiber
It is transferred to the first port and second port (1,2 in figure) of four port circulators, then passes through third optical coupler OC3, the
The first tunable optical filter that one adjustable light delay OTDL1, the 4th optical coupler OC4 are constituted reaches the first saturable and inhales
It after acceptor reflecting mirror SAM1, is reflected through the first tunable optical filter and filters again, then pass through the second of four port circulators
Port and third port (2,3 in figure) again pass by the second optical coupler OC2, the second wavelength division multiplexer WDM2, Er-doped fiber
EDF, the first wavelength division multiplexer WDM1, Polarization Controller PC return to the first optical coupler OC1, and another part passes through the first isolation
It is exported after device ISO1.
Counterclockwise, using the second optical coupler OC2 as starting point, laser signal transmission is annular to four ports in optical fiber
The 5th optical coupler OC5, the second adjustable light delay are then passed through in the third port of device and the 4th port (3,4 in figure)
The second tunable optical filter filtering that OTDL2, the 6th optical coupler OC6 are constituted, reaches the second saturable absorber reflecting mirror
It after SAM2, is reflected through the second tunable optical filter and filters again, then pass through the 4th port and first of four port circulators
Port (4,1 in figure), by the first optical coupler OC1, Polarization Controller PC, the first wavelength division multiplexer WDM1, Er-doped fiber
EDF, the second wavelength division multiplexer WDM2 return to the second optical coupler OC2, and another part exports after crossing the second isolator ISO2.
It should be added that:
For the light of clockwise transmission, is inputted by the first port of four port circulators, export, pass through from second port
Third optical coupler OC3 points are the identical two-way of intensity.Wherein pass through the first adjustable light delay OTDL1 and the 4th light all the way
It learns coupler OC4 to be connected, in addition directly be connected all the way with the 4th optical coupler OC4.Third optical coupler OC3 and the 4th light
An adjustable Mach-Zehnder interferometer is formd between coupler OC4, periodic filter is carried out to the spectrum passed through.It is filtered
Wave period is determined by the optical path difference of two-arm above and below filter.The wherein difference on the frequency of each transmission peaks of filter, that is, frequency comb
Repetition rate, the calculation formula of the frequency comb FSR with peri odic spectrum interval of generation are as follows:
Wherein, c is the light velocity；Δ L is optical path difference (i.e. the first adjustable light delay of conspicuous-Zeng Deer interferometer or more two-arm
With the optical path difference between the first optical fiber).Therefore, adjusting frequency comb can be reached by adjusting the length of the first adjustable light delay
The purpose of repetition rate.The light exported from the 4th optical coupler OC4 is by the first saturable absorber reflecting mirror SAM1 to light
Spectral intensity carries out non-linear absorption.Light intensity at Mach-Zehnder interferometer transmission peak value is most strong, the first saturable absorber
The absorption of reflecting mirror SAM1 is also weaker.Light intensity is weaker at non-Mach-Zehnder interferometer transmission peak value, the first saturable absorption
The Nonlinear optical absorption of body reflecting mirror SAM1 is also stronger, further decreases the Q value for not needing light frequency.It is inhaled from the first saturable
The light of acceptor reflecting mirror SAM1 reflection is again passed by by the 4th optical coupler OC4, third optical coupler OC3 and first is adjustable
The Mach-Zehnder interferometer of optical time delay unit OTDL1 composition, is filtered again.After secondary filtering the light of clockwise transmission from
The second port input third port output of four port circulators.Pass through the second optical coupler OC2 and the second wavelength division multiplexer
It is amplified after WMD2 by Er-doped fiber EDF.The light of clockwise transmission is carried out by this process circulation later, is polarized by adjusting
Controller PC can make laser establish mode locking.By adjusting the available required repetition frequency of the first adjustable light delay OTDL1
The frequency comb of rate.The laser of clockwise transmission is exported by the first optical coupler OC1 and the first isolator ISO1, is obtained
Repetition rate is the frequency comb of FSR1.
For its transmission direction of the light of counterclockwise transmission and clockwise on the contrary, therefore at four port circulators and clockwise
The light of transmission separates.It is inputted via four port circulator third ports, the output of the 4th port.By by the 5th optical coupler
The the second Mach-Zehnder interferometer formed between OC5, the 6th optical coupler OC6, the second Mach-Zehnder interferometer are saturating
Penetrating peak periodic frequency difference is FSR2.Light same spectra with clockwise transmission is by the second Mach-Zehnder interferometer and first
Saturable absorber reflecting mirror SAM2 generates periodic filter.Reflected light is via the second Mach-Zehnder interferometer from four ports
4th port feed-in of circulator, first port output.Hereafter, the light of counterclockwise transmission is by the first photo-coupler OC1 and the
One wavelength division multiplexer WDM1, which is fed into again in Er-doped fiber EDF, to be amplified.This process circulation carries out, and final mode stable is built
It is vertical.The laser of counterclockwise transmission is exported by the second optical coupler OC2 and the second isolator ISO2, obtains repetition rate
For the frequency comb of FSR2.
Therefore, can be changed by adjusting the length of the first adjustable light delay OTDL1 and the second adjustable light delay OTDL2
Repetition rate and the repetition rate for becoming two frequency combs are poor.Such as: as Δ L1=15mm, Δ L2=14.29mm, obtain two
Frequency comb repetition rate FSR1=20GHz, FSR2=21GHz.The difference of repetition rate is 1GHz.
To sum up, it is double to overcome single-chamber for adjustable high repetition frequency single-chamber bicoherence optical frequency com light source proposed by the present invention
Optical comb technology repetition rate is low and the nonadjustable disadvantage of difference on the frequency, is obviously improved its repetition rate and difference on the frequency.It is full
Double requirements of the light comb signal processing to light source of foot microwave photon, can be significantly reduced system bulk, cost and complexity, and mention
Rise the spectral region of light source.
Claims (5)
1. a kind of adjustable high repetition frequency single-chamber bicoherence optical frequency com light source, it is characterised in that:
Including the first pump laser, the second pump laser, the first wavelength division multiplexer, the second wavelength division multiplexer, Er-doped fiber,
Polarization Controller, the first optical coupler, the first isolator, four port circulators, the first tunable optical filter, the second tunable optical
Filter, the second optical coupler and the second isolator；
First pump laser is connect by the first wavelength division multiplexer with Er-doped fiber；
First wavelength division multiplexer is connect by Polarization Controller with the first optical coupler；
The a port of first optical coupler is exported outward by the first isolator, another port and four port circulators
First port connection；
The second port of four port circulators connects the first tunable optical filter；
Second pump laser is connect by the second wavelength division multiplexer with Er-doped fiber；
Second wavelength division multiplexer is connect with the second optical coupler；
The a port of second optical coupler is exported outward by the second isolator, another port and four port circulators
Third port connection；
4th port of four port circulators connects the second tunable optical filter；
First tunable optical filter and the second tunable optical filter are identical, and being respectively used to generate has peri odic spectrum interval
Frequency comb.
2. adjustable high repetition frequency single-chamber bicoherence optical frequency com light source according to claim 1, it is characterised in that: institute
The first tunable optical filter is stated to include third optical coupler, the first adjustable light delay, the 4th optical coupler, first can satisfy
With absorber reflecting mirror and the first optical fiber；
The input terminal of third optical coupler is connect with the second port of four port circulators, the output end of third optical coupler
It is two, an output end is connect by the first adjustable light delay with the input terminal of the 4th optical coupler, other end output
End is directly connect with the input terminal of the 4th optical coupler, and the output end and the first saturable absorber of the 4th optical coupler are anti-
Penetrate mirror connection；
Second tunable optical filter includes the 5th optical coupler, the second adjustable light delay, the 6th optical coupler, the
Two and absorber reflecting mirror and the second optical fiber；
The input terminal of 5th optical coupler is connect with the 4th port of four port circulators, the output end of the 5th optical coupler
It is two, an output end is connect by the second adjustable light delay with the input terminal of the 6th optical coupler, other end output
End is directly connect with the input terminal of the 6th optical coupler, and the output end and the second saturable absorber of the 6th optical coupler are anti-
Penetrate mirror connection.
3. adjustable high repetition frequency single-chamber bicoherence optical frequency com light source according to claim 2, it is characterised in that: the
The calculation formula for the frequency comb FSR with peri odic spectrum interval that one tunable optical filter and the second tunable optical filter generate
Are as follows:
Wherein, c is the light velocity；
Δ L is optical path difference between the first adjustable light delay and the first optical fiber or is the second adjustable light delay and the second light
Optical path difference between fibre.
4. adjustable high repetition frequency single-chamber bicoherence optical frequency com light source according to claim 3, it is characterised in that: the
The splitting ratio of one optical coupler and the second optical coupler is 10:90.
5. adjustable high repetition frequency single-chamber bicoherence optical frequency com light source according to claim 4, it is characterised in that: the
The splitting ratio of three optical couplers and the 5th optical coupler is 50:50.
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