CN109638621A - KHz magnitude single-pass band microwave photon filter - Google Patents
KHz magnitude single-pass band microwave photon filter Download PDFInfo
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- CN109638621A CN109638621A CN201910057155.1A CN201910057155A CN109638621A CN 109638621 A CN109638621 A CN 109638621A CN 201910057155 A CN201910057155 A CN 201910057155A CN 109638621 A CN109638621 A CN 109638621A
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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
- H01S3/06754—Fibre amplifiers
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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
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
- H01S3/083—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
- H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1022—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping
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Abstract
Present disclose provides a kind of kHz magnitude single-pass band microwave photon filters, comprising: laser, the first photo-coupler, SSSC Single Sideband Suppressed Carrier modulation module, single sideband modulation module, microwave signal source, the first image intensifer, the second image intensifer, the second photo-coupler, single-frequency Brillouin optical fiber laser, photodetector and vector network analyzer.The disclosure realizes that ultra-narrow single-pass band microwave photon filters using the gain cavity of single-frequency Brillouin optical fiber laser, solving existing microwave photon filter can not achieve the technical issues of following single-pass band of MHz magnitude filters, and the three dB bandwidth for the filter that the disclosure provides obtains significant breakthrough, it can achieve kHz magnitude, while its CFS center frequency stabilization, tunable, Out-of-band rejection are than high.
Description
Technical field
This disclosure relates to which microwave photon signal processing and electronic countermeasure field more particularly to a kind of kHz magnitude single-pass band are micro-
Glistening light of waves subfilter.
Background technique
Microwave photonics are the products that microwave is merged with photon technology, in the side such as generation, transmission and processing of radiofrequency signal
Mask has wide practical use.Microwave photon filter is using photon technology to the microwave being modulated on light carrier in area of light
Signal is handled, and finally realizes filter function, bandwidth, tuning, in terms of there is traditional electrical domain filter to be difficult to
The advantage of analogy is the core technology in Microwave photonics field, causes the extensive research of people.
It is periodic to have the shortcomings that the single tape pass filtering technique an of passband overcomes frequency response, in wireless communication, passes
The fields such as sense, biology and military affairs have been widely applied, and the key index for measuring single band-pass filtering property is the 3dB band of single-pass band
Wide Δ f3dB, for single-pass band filter, three dB bandwidth Δ f3dBSmaller, then the frequency selective characteristic of filter is better, can be more quasi-
Required frequency really is filtered out, therefore realizes ultra-narrow three dB bandwidth Δ f3dBSingle-pass band microwave photon filter becomes research hotspot.
Currently, the scheme of a variety of microwave photon filtering for realizing ultra-narrow single-pass band exists in the prior art, and such as: Yi Zhongji
It is suggested in the single-pass band microwave photon filter that wideband light source and Mach increase Dare interference structure, by being adopted to broadband optical signal
Sample and Mach increase Dare interferometer and weight to sampled signal, obtain multiple tap coefficients, thus realize that single-pass band filters,
Three dB bandwidth Δ f3dBFor several hundred MHz；A kind of microwave photon single-pass band filter based on stimulated Brillouin scattering is suggested, the filter
Wave device is handled using the optical signal that the narrowband gain characteristic of stimulated Brillouin scattering modulates microwave, realizes the filter of single-pass band
Wave, three dB bandwidth Δ f3dIt can achieve 24.4MHz；Notification number discloses entitled " a kind of super for the patent document of 103715480B
The single tape of high quality factor leads to tunable microwave photon filter " invention, by by the increasing of stimulated Brillouin scattering in optical fiber
The method that benefit spectrum is superimposed with loss spectra, effectively reduces the gain spectral width of stimulated Brillouin scattering, realizes ultrahigh quality factor
Single-pass band microwave photon filtering technique, three dB bandwidth Δ f3dBFor 4.14MHz, regulable center frequency range 0.3GHz-
29.7GHz。
Although having many single-pass band microwave photon filter schemes, its key index three dB bandwidth Δ f at present3dBBy
Limitation, is still MHz magnitude, can't realize that narrower (kHz magnitude even Hz magnitude) single-pass band microwave photon is filtered, is unable to satisfy
High pure frequency spectrum microwave signal generates, high-resolution microwave photon senses and the application fields such as high performance microwave photon radar.
Summary of the invention
(1) technical problems to be solved
Existing microwave photon filter technical solution is difficult to realize the following single-pass band filtering of three dB bandwidth MHz magnitude, Wu Faman
Sufficient high pure frequency spectrum microwave signal generates, high-resolution microwave photon senses and the application fields such as high performance microwave photon radar.
(2) technical solution
The embodiment of the present disclosure provides a kind of kHz magnitude single-pass band microwave photon filter, comprising: laser, the first light
Coupler, SSSC Single Sideband Suppressed Carrier modulation module, single sideband modulation module, microwave signal source, the first image intensifer, the second light are put
Big device, the second photo-coupler, single-frequency Brillouin optical fiber laser, photodetector and vector network analyzer, in which:
Generating frequency by laser is fcLaser, beam of laser and the second beam are divided into after the first photo-coupler and is swashed
Light, the beam of laser enter SSSC Single Sideband Suppressed Carrier modulation module, and the second beam laser enters single sideband modulation module；
The frequency of microwave signal source output is fpMicrowave signal be modulated to by SSSC Single Sideband Suppressed Carrier modulation module
In beam of laser, SSSC Single Sideband Suppressed Carrier modulated signal is formed, the SSSC Single Sideband Suppressed Carrier modulated signal includes the first top
Band fc+fp, the first upper side band fc+fpIt passes sequentially through the first image intensifer, the second photo-coupler and enters single-frequency Brillouin later
Optical fiber laser, the first upper side band fc+fpPower be less than single-frequency Brillouin optical fiber laser exciting power threshold value,
The gain spectral that three dB bandwidth is kHz magnitude is formed in single-frequency Brillouin optical fiber laser, the centre frequency of gain spectral is fc+fp-fB、
Three dB bandwidth is Δ fSFBFL, wherein fBFor Brillouin shift.
The frequency of vector network analyzer output is fRFFrequency sweep microwave signal be modulated to by single sideband modulation module
On two beam laser, single sideband modulated signal is formed, the single sideband modulated signal includes light carrier fcWith the second upper side band fc+
fRF, the light carrier fcWith the second upper side band fc+fRFIt passes sequentially through the second image intensifer, the second photo-coupler and enters single-frequency later
Brillouin optical fiber laser, the light carrier fcPower be greater than single-frequency Brillouin optical fiber laser exciting power threshold value, swash
Sending frequency is fc-fBLaser；The second upper side band fc+fRFOptical power be located at the single-frequency Brillouin optical fiber laser
Exciting power threshold value under, generate backscatter signal, when the backscatter signal frequency is in the first upper side band fc+fp
Gain spectral (the centre frequency f of generationc+fp-fB, three dB bandwidth be Δ fSFBFL) frequency range in when, obtain gain be amplified,
Laser signal is inspired, and is f with frequencyc-fBLaser in photodetector beat frequency, generate microwave signal；
The microwave signal that the photodetector generates is inputted into vector network analyzer, obtains the microwave photon filtering
The frequency response characteristic of device.
Optionally, the single-pass mid-band frequency f of the filterpassEqual to fp；The three dB bandwidth Δ f of the filterpass
Equal to the three dB bandwidth Δ f of the gain cavity of the single-frequency Brillouin optical fiber laserSFBFL。
Optionally, the splitting ratio of first photo-coupler is 50%: 50%, and the splitting ratio of second photo-coupler is
50%: 50%.
Optionally, the single-frequency Brillouin optical fiber laser, comprising: sequentially connected optical circulator, third photo-coupler,
4th photo-coupler, the 5th photo-coupler, optoisolator, highly nonlinear optical fiber, and the highly nonlinear optical fiber and the ring of light
The connection of shape device, constitutes an optical circuit, forms an optical resonator.
Optionally, the splitting ratio of the third photo-coupler is 50%: 50%, and the splitting ratio of the 4th photo-coupler is
X%: (100-x) %, the splitting ratio of the 5th photo-coupler is x%: (100-x) %, it is preferable that x >=90.
Optionally, the 4th photo-coupler and the 5th photo-coupler constitute optic fiber ring-shaped cavity；
4th photo-coupler includes port four or two and port four or four；5th photo-coupler includes five or two He of port
Port the May 4th；
Port four or two and port five or two are attached by optical fiber, carried out port four or four and port the May 4th by optical fiber
Connection, constitutes the optic fiber ring-shaped cavity；
Ratio through the 4th photo-coupler beam splitting is the light beam of (100-x) %, the ratio through the 5th photo-coupler beam splitting is
The light beam of x% transmits in fiber optic loop an actor's rendering of an operatic tune.
Optionally, the three dB bandwidth Δ f of the free spectral limit FSR1 of the optic fiber ring-shaped cavity and formantringMeet following
Condition:
FSR1≥ΔfB
Δfring≤FSR2
Wherein, Δ fBFor the three dB bandwidth of the brillouin gain spectrum of the highly nonlinear optical fiber, FSR2 is in the single-frequency cloth
The mode spacing of deep optical fiber laser, it is preferable that the chamber of the optic fiber ring-shaped cavity is long less than 8 meters.
(3) beneficial effect
It can be seen from the above technical proposal that disclosure kHz magnitude single-pass band microwave photon filter at least have it is following
One of beneficial effect or in which a part:
1, single sideband modulation optical signal is injected into single-frequency Brillouin optical fiber laser, is swashed using single-frequency Brillouin fiber optic
The optical gain chamber of light device ultra-narrow carries out light amplification, and solving existing microwave photon filter can not achieve MHz magnitude to place an order
The problem of passband filters, the three dB bandwidth Δ f of disclosure microwave photon filter3dBSignificant breakthrough is obtained, can achieve kHz magnitude
Even Hz magnitude.
2, by adjusting the pumping light frequency that is injected into single-frequency Brillouin optical fiber laser, in adjustable filter
Frequency of heart has the advantages that centre frequency is fine adjustable.
3, single-frequency Brillouin optical fiber laser exports laser frequency stabilization, thus the centre frequency of the microwave photon filter
Stablize, it is affected by environment small.
4, the radiofrequency signal in the microwave photon filter free transmission range is that two beam laser beat frequencies generate, in logical
Outside band range, only generating beam of laser, no beat frequency radiofrequency signal, therefore the microwave photon filter has Out-of-band rejection than high
Advantage.
Detailed description of the invention
In order to which the disclosure and its advantage is more fully understood, referring now to being described below in conjunction with attached drawing, in which:
Fig. 1 is structural schematic diagram of the kHz magnitude single-pass with microwave photon filter that the embodiment of the present disclosure provides；
Fig. 2 is that the kHz magnitude single-pass that the embodiment of the present disclosure provides swashs with single-frequency Brillouin fiber optic in microwave photon filter
The structural schematic diagram of light device；
Fig. 3 is that the kHz magnitude single-pass that the embodiment of the present disclosure provides swashs with single-frequency Brillouin fiber optic in microwave photon filter
The schematic illustration of light device；
Fig. 4 is schematic illustration of the kHz magnitude single-pass with microwave photon filter that the embodiment of the present disclosure provides；
Fig. 5 is that the kHz magnitude single-pass that the embodiment of the present disclosure provides swashs with single-frequency Brillouin fiber optic in microwave photon filter
The laser of light device output enters the beat frequency spectrogram that detector obtains；
Fig. 6 is frequency response characteristic figure of the kHz magnitude single-pass with microwave photon filter that the embodiment of the present disclosure provides；
Fig. 7 is the humorous spy of regulable center frequency of the kHz magnitude single-pass with microwave photon filter that the embodiment of the present disclosure provides
Property figure；
Fig. 8 is that the kHz magnitude single-pass that the embodiment of the present disclosure provides swashs with single-frequency Brillouin fiber optic in microwave photon filter
Another scheme of light device.
Wherein, appended drawing reference are as follows:
100, laser；200, the first photo-coupler；300, SSSC Single Sideband Suppressed Carrier modulation module；400, single sideband modulation
Module；500, microwave signal source；600, the second photo-coupler；700, single-frequency Brillouin optical fiber laser；800, photodetector；
900, vector network analyzer；
210, port is one by one；220, port one or two；230, port one or three；
310, the first light input port；320, the first optical output port；330, the first microwave input port；
410, the second light input port；420, the second optical output port；430, the second microwave input port；
610, port 21；620, port two or two；630, port two or three；
710, optical circulator；720, third photo-coupler；730, the 4th photo-coupler；740, the 5th photo-coupler；750,
Optoisolator；760, highly nonlinear optical fiber；
711, port is 1. (single-frequency Brillouin optical fiber laser input port)；712, port is 2.；713, port is 3.；
721, port 31；722, port three or two (single-frequency Brillouin optical fiber laser output port)；723, port three or three；
731, port 41；732, port four or two；733, port four or three；734, port four or four；
741, port May Day；742, port five or two；743, port five or three；744, port the May 4th；
770, the first fiber grating；780, the second fiber grating.
Specific embodiment
Present disclose provides a kind of kHz magnitude single-pass band microwave photon filters, utilize single-frequency Brillouin optical fiber laser
The ultra-narrow gain cavity of (SFBFL, single-frequency Brillouin fiber laser) realizes ultra-narrow single-pass band microwave
Photon filtering, solving existing microwave photon filter can not achieve the technical issues of following single-pass band of MHz magnitude filters, the present invention
The three dB bandwidth Δ f of microwave photon filter3dBCan achieve kHz even Hz magnitude, while its CFS center frequency stabilization, it is tunable,
Out-of-band rejection is than high.
For the purposes, technical schemes and advantages of the disclosure are more clearly understood, below in conjunction with specific embodiment, and reference
The disclosure is further described in attached drawing.
The embodiment of the present disclosure provides a kind of kHz magnitude single-pass band microwave photon filter, and Fig. 1 is the Hz magnitude single-pass
System structure diagram with microwave photon filter, referring to Fig. 1, the microwave photon filter includes: laser 100,
One photo-coupler 200, SSSC Single Sideband Suppressed Carrier modulation module 300, single sideband modulation module 400, microwave signal source 500, first
Image intensifer, the second image intensifer, the second photo-coupler 600, single-frequency Brillouin optical fiber laser 700, photodetector 800 and
Vector network analyzer 900.
Wherein, the laser 100 is connect with the first photo-coupler 200, and first photo-coupler 200 presses down with single-side belt
Carrier modulation block 300 processed connects；First photo-coupler 200 is connect with single sideband modulation module 400 simultaneously；It is described unilateral
Band suppressed carrier modulation module 300 is connect with microwave signal source 500；The SSSC Single Sideband Suppressed Carrier modulation module 300, the first light
Amplifier, the second photo-coupler 600 and single-frequency Brillouin optical fiber laser 700 are sequentially connected；The single sideband modulation module 400
It is connect with vector network analyzer 900；The single sideband modulation module 400, the second image intensifer, second photo-coupler
600 and the single-frequency Brillouin optical fiber laser 700 be sequentially connected；The single-frequency Brillouin optical fiber laser 700, photodetection
Device 800 and vector network analyzer 900 are sequentially connected.
In one feasible mode of the disclosure, the splitting ratio of first photo-coupler 200 is 50%: 50%, packet
It includes: the port being attached with the laser 100 one by one 210, the port being connect with SSSC Single Sideband Suppressed Carrier modulation module 300
One two 220, and the port 1 being connect with the single sideband modulation module 400.
The working principle of the embodiment of the present disclosure are as follows: generating frequency by laser 100 is fcLaser, by the first optical coupling
210 input one by one of the port of device 200, is then beamed into two beam laser with coupling ratio for 50%: 50%, wherein beam of laser is by holding
One two 220 output of mouth enters SSSC Single Sideband Suppressed Carrier modulation module 300, and in addition beam of laser is exported by port 1 and entered
Single sideband modulation module 400；The frequency exported from microwave signal source 500 is fpMicrowave signal pass through SSSC Single Sideband Suppressed Carrier tune
Molding block 300 is modulated to laser fcOn, the output signal of SSSC Single Sideband Suppressed Carrier modulation module 300 is that frequency is fc+fpTop
Band (i.e. the first upper side band) enters single-frequency Brillouin light by the second photo-coupler 600 after the amplification of the first image intensifer
Fibre laser 700, the pump light as the microwave photon filter；What is exported from vector network analyzer 900 filters for measuring
The frequency sweep microwave signal f of wave device frequency response characteristicRFLaser f is modulated to by single sideband modulation module 400cOn, single-side belt tune
The output signal of molding block 400 is that frequency is fcLight carrier and frequency be fc+fRFUpper side band (i.e. the second upper side band), pass through
Single-frequency Brillouin optical fiber laser 700 is entered by the second photo-coupler 600 after the amplification of second image intensifer；Single-frequency Brillouin
The output signal of optical fiber laser 700 enters photodetector 800, and the microwave signal that photodetector 800 exports is inputted into arrow
Network Analyzer 900 is measured, to obtain the frequency response characteristic of disclosure microwave photon filter.
In one feasible mode of the disclosure, wherein laser 100 is tunable narrow-linewidth laser, is microwave signal
Light carrier is provided, meanwhile, after shift frequency, avoided as the pump light of the microwave photon filter using same laser
Since laser wavelength drift causes the centre frequency of microwave photon filter unstable.
In one feasible mode of the disclosure, the SSSC Single Sideband Suppressed Carrier modulation module 300 includes: and the port
One two 220 the first light input ports 310 being connected, the first optical output port 320 being connect with first image intensifer, and
The first microwave input port 330 being connect with the microwave signal source 500.
In one feasible mode of the disclosure, the single sideband modulation module 400 includes: and the port 1
Connection the second light input port 410, the second optical output port 420 being connect with second image intensifer, and with the arrow
Measure the second microwave input port 430 that Network Analyzer 900 connects.
In one feasible mode of the disclosure, the splitting ratio of second photo-coupler 600 is 50%: 50%, packet
Include: the port 21 610 connecting with the single-frequency Brillouin optical fiber laser 700 is connected with first image intensifer
Port 22 620, and the port 23 630 being connected with second image intensifer.
Wherein, SSSC Single Sideband Suppressed Carrier modulation module 300 have many schemes with single sideband modulation module 400 can be real
Existing, the embodiment of the present disclosure is not specifically limited this, such as takes the schemes such as phase-modulator and optical filter, no longer superfluous herein
It states.
Fig. 2 is that the kHz magnitude single-pass that the embodiment of the present disclosure provides swashs with single-frequency Brillouin fiber optic in microwave photon filter
The structural schematic diagram of light device, referring to fig. 2, the single-frequency Brillouin optical fiber laser 700, comprising: sequentially connected optical circulator
710, third photo-coupler 720, the 4th photo-coupler 730, the 5th photo-coupler 740, optoisolator 750, highly nonlinear optical fiber
760；And the highly nonlinear optical fiber 760 is connect with the optical circulator 710.Cloth is excited in the wherein offer of highly nonlinear optical fiber 760
In deep gain.
The optical circulator 710 includes: the port that connect with the port 21 610 1. 711, and port is 1. 711 as single
The input port of frequency Brillouin optical fiber laser 700, the port being connect with the highly nonlinear optical fiber 760 2. 712, and with it is described
The port 3. 713 that third photo-coupler 720 connects.
The splitting ratio of the third photo-coupler 720 is 50%: 50% comprising: the port with the optical circulator 710
3. the port 31 721 of 713 connections, the port 32 722 connecting with the photodetector 800, port 32 722 is as single
The output port of frequency Brillouin optical fiber laser 700, and the port 33 723 being connect with the 4th photo-coupler 730.
The splitting ratio of 4th photo-coupler 730 is x%: (100-x) % comprising: with the third photo-coupler
The port 41 731 that 720 port 33 723 connects, the port four or two being attached respectively with the 5th photo-coupler 740
732 and port 44 734 and port 43 733, port 43 733 be the port given it up in the embodiment of the present disclosure.
The splitting ratio of 5th photo-coupler 740 is x%: (100-x) % comprising: connect with the optoisolator 750
The port May Day 741 connect, the port 52 742 being connect with the port 42 732, the end being connect with the port 44 734
Mouth the May 4th 744 and port 53 743, port 53 743 are the port given it up in the embodiment of the present disclosure.
In the embodiments of the present disclosure, the 4th photo-coupler 730 and the 5th photo-coupler 740 form an optic fiber ring-shaped cavity,
Ratio through 730 beam splitting of the 4th photo-coupler is the light beam of (100-x) %, the ratio through 740 beam splitting of the 5th photo-coupler is x%
Light beam transmitted in fiber optic loop an actor's rendering of an operatic tune.
In the embodiments of the present disclosure, optical circulator 710, third photo-coupler 720, the 4th photo-coupler 730, the 5th optocoupler
Clutch 740, optoisolator 750 and highly nonlinear optical fiber 760 constitute an optical circuit, form an optical resonator, Gao Fei
Linear optical fiber 760 provides excited Brillouin gain, and from port, 1. the 711 Brillouin's pump lights inputted are as driving source, thus full
The three elements of sufficient laser；The optic fiber ring-shaped cavity of 4th photo-coupler 730 and the 5th photo-coupler 740 composition plays frequency selection
The effect of laser frequency is exported with stabilization, to guarantee that the output light of Brillouin optical fiber laser 700 is stable single-frequency light.
In the embodiments of the present disclosure, with frequency fcLight carrier for illustrate the original of single-frequency Brillouin optical fiber laser 700
Reason, light carrier fcFrom port 1. 711 input, by the port 2. 712 of optical circulator 710, into highly nonlinear optical fiber 760,
It is f that frequency is generated in highly nonlinear optical fiber 760c-fB(fBFor light carrier fcIn the Brillouin shift of highly nonlinear optical fiber 760), instead
To the spontaneous brillouin scattering signal of transmission, spontaneous brillouin scattering signal by optical circulator 710 port 2. 712 and port
3. 713, by third photo-coupler 720, by the fiber optic loop being made of the 4th photo-coupler 730 and the 5th photo-coupler 740
Shape chamber, by isolator 750, into highly nonlinear optical fiber 760, spontaneous brillouin scattering signal fc-fBIt is exactly in light carrier fc
Brillouin gain spectral limit in, and with light carrier fcTransmission direction is opposite；If light carrier fcPower meet excited Brillouin
Scatter threshold value, light carrier fcWith spontaneous brillouin scattering signal fc-fBIt interacts, is excited in highly nonlinear optical fiber 760
Brillouin scattering, spontaneous brillouin scattering signal fc-fBIt is amplified；Spontaneous brillouin scattering signal fc-fBIn optical resonator
It is transmitted several times, if the gain that stimulated Brillouin scattering provides is lost greater than ring cavity, will generate frequency is fc-fBLaser signal,
It is exported from port 32 722.
In addition, Fig. 3 is single-frequency Brillouin light in the kHz magnitude single-pass band microwave photon filter of embodiment of the present disclosure offer
The schematic illustration of fibre laser, it is described in order to realize that 700 single-frequency laser of single-frequency Brillouin optical fiber laser exports referring to Fig. 3
4th photo-coupler 730 constitutes optic fiber ring-shaped cavity, the free spectral limit of the optic fiber ring-shaped cavity with the 5th photo-coupler 740
The three dB bandwidth Δ f of FSR1 and formantringMeet following condition:
FSR1≥ΔfB (1)
Δfring≤FSR2 (2)
Wherein, Δ fBFor the three dB bandwidth of the brillouin gain spectrum of the highly nonlinear optical fiber 760, FSR2 is the single-frequency
The mode spacing of Brillouin optical fiber laser 700, by the optical resonance cavity length L of single-frequency Brillouin optical fiber laser 700cavCertainly
It is fixed；The three dB bandwidth Δ f of the brillouin gain spectrum of highly nonlinear optical fiber 760BAbout 25MHz, in order to meet the condition of formula (1), root
According to the calculation formula FSR=c/nL of free spectral limit it is found that being made of the 4th photo-coupler 730 and the 5th photo-coupler 740
The chamber length of optic fiber ring-shaped cavity should be less than 8 meters.In addition, the three dB bandwidth Δ f of optic fiber ring-shaped cavity formantringWith light in annular chamber
The loss of middle one circle of transmission is inversely proportional, in order to meet the condition of formula (2), selection loss lower, splitting ratio x%: (100-x) %
In x >=90 the 4th photo-coupler 730 and the 5th photo-coupler 740.
Fig. 4 is schematic illustration of the kHz magnitude single-pass with microwave photon filter that the embodiment of the present disclosure provides, referring to figure
4, wherein (a) figure in Fig. 4 is the output signal point of SSSC Single Sideband Suppressed Carrier modulation module 300 and single sideband modulation module 400
The spectral schematic of output signal not after the first image intensifer and the amplification of the second image intensifer；The single sideband modulation module
400 output signal includes that frequency is fcLight carrier and frequency be fc+fRFUpper side band, wherein fRFIt is the vector network point
The frequency sweep microwave signal frequency that analyzer 900 exports；Frequency is fcLight carrier by the second image intensifer amplification after, power
Value is located on the exciting power threshold value of single-frequency Brillouin optical fiber laser 700, and inspiring frequency is fc-fBLaser, fBFor light
Carrier wave fcIn the Brillouin shift of the highly nonlinear optical fiber 760；Frequency is fc+fRFUpper side band put by the second image intensifer
After big, optical power is located under the exciting power threshold value of the single-frequency Brillouin optical fiber laser 700, generates back scattering
Signal；The output signal of the SSSC Single Sideband Suppressed Carrier modulation module 300 includes that frequency is fc+fpUpper side band, wherein fpFor
The microwave signal frequency that the microwave signal source 500 exports, after first image intensifer amplification, in the single-frequency cloth
In deep optical fiber laser 700 resonant cavity in form gain spectral, the centre frequency of the gain spectral is fc+fp-fB, three dB bandwidth is
ΔfSFBFL；
(b) figure in referring to fig. 4, (b) figure in Fig. 4 are the output signal spectrum of single-frequency Brillouin optical fiber laser 700
Schematic diagram, frequency fcExciting power threshold value of the light carrier power due to meeting single-frequency Brillouin optical fiber laser 700, excitation
Frequency is f outc-fBLaser；Frequency is fc+fpUpper side band power close to single-frequency Brillouin optical fiber laser 700 excitation
Power threshold, forms a ultra-narrow gain spectral, and the centre frequency of gain spectral is fc+fp-fB, three dB bandwidth be Δ fSFBFL；Frequency is
fc+fRFUpper side band do not reach the exciting power threshold value of single-frequency Brillouin optical fiber laser 700, it is low-down only to generate power
Backscatter signal；But when the frequency of backscatter signal is in fc+fpGain spectral (the centre frequency f of generationc+fp-fB、
Three dB bandwidth is Δ fSFBFL) in range when, gain will be obtained and be amplified, to inspire laser signal, and this laser signal and frequency
Rate is fc-fBLaser coherence, this two beams laser signal beat frequency in photodetector 800, generate microwave signal.
(c) figure in referring to fig. 4, (c) figure in Fig. 4 are that the microwave signal that obtains after 800 beat frequency of photodetector is defeated
Enter into vector network analyzer 900, to obtain the schematic diagram of the frequency response characteristic of disclosure microwave photon filter.This is micro-
The passband central frequency f of glistening light of waves subfilterpass=(fc+fp-fB)-(fc-fB)=fp, thus by adjusting frequency fp, can adjust
Save the passband central frequency f of microwave photon filterpass, have the advantages that single-pass mid-band frequency is tunable；It is noticeable
It is Brillouin shift fBValue and pump light frequency dependence, Brillouin shift f corresponding to the pump light of different frequencyB?
Difference, in the embodiments of the present disclosure, frequency fc+fpUpper side band and frequency be fcLight carrier due to caused by difference on the frequency
Brillouin shift fBDifference do not account for；The three dB bandwidth Δ f of the microwave photon filterpassSwash equal to single-frequency Brillouin fiber optic
The three dB bandwidth Δ f of the gain cavity of light device 700SFBFL, i.e. Δ fpass=Δ fSFBFL。
In the embodiments of the present disclosure, laser 100 is narrow linewidth laser, single in the case where its line width is Hz magnitude
The gain cavity three dB bandwidth Δ f of frequency Brillouin optical fiber laser 700SFBFLIt can be indicated by following formula:
Wherein, c is vacuum light speed, neffFor effective refractive index, Lcav, r be respectively single-frequency Brillouin optical fiber laser 700
The light amplitude feedback factor of chamber length and chamber.
By formula (3) it is found that the gain cavity 3dB width Delta f of single-frequency Brillouin optical fiber laser 700SFBFLBy the long L of its chambercavWith
And the light amplitude feedback factor r of chamber is determined, and Δ fSFBFLWith Lcav, r be inversely proportional, pass through increase LcavAnd r is improved, it may be implemented
Ultra-narrow gain cavity Δ fSFBFL。
Ideally, light loss is equal to gain, i.e. r when the generation of single-frequency Brillouin optical fiber laser 700 laser resonance
=1, gain spectral Δ fSFBFL=0, gain cavity is infinitely narrow.But since spontaneous scattering noise, spontaneous emission noise etc. influence, r is not
It is likely to be breached 1, but still is close in 1.
Assuming that r=0.99, the long L of chambercavFor 5km, then Δ fSFBFL=132.2Hz.By the above theory deduction it is found that single-frequency cloth
In deep optical fiber laser 700 can realize ultra-narrow three dB bandwidth Δ fSFBFL, due to the three dB bandwidth Δ f of microwave photon filterpass=
ΔfSFBFL, therefore the three dB bandwidth of the microwave photon filter of the disclosure can achieve kHz even Hz amount to obtain significant breakthrough
Grade.
As a specific embodiment of the disclosure, the length for choosing highly nonlinear optical fiber 760 is 530 meters, the 4th optocoupler
The splitting ratio x=90 of clutch 730 and the 5th photo-coupler 740, the 4th photo-coupler 730 and the 5th photo-coupler 740 composition
A length of 4 meters of the chamber of optic fiber ring-shaped cavity, meet the condition of formula (1) and (2), in the above conditions, measures single-frequency Brillouin fiber optic
The single-frequency characteristic of laser 700 and the frequency response of the microwave photon filter and centre frequency tuning characteristic.
In the above specific embodiment, Fig. 5 is that the output laser of single-frequency Brillouin optical fiber laser 700 inputs entering light electrical resistivity survey
The beat frequency spectrogram of device is surveyed, beat frequency noise is very small, not by the rf frequency of neighboring modes beat frequency, illustrates that laser 700 is
Single-frequency laser output.
In the above specific embodiment, Fig. 6 is that frequency response of the kHz magnitude single-pass with microwave photon filter is special
Property, as shown in Figure 6, passband central frequency fpass=10GHz, Δ fpass≈10kHz.Corresponding light amplitude feedback factor r ≈
The theoretical calculation of 0.92, three dB bandwidth 10kHz meeting formula (3).Therefore the three dB bandwidth Δ f of the microwave photon filter of the disclosure3dB
Significant breakthrough is achieved, can achieve kHz even Hz magnitude.
In the above specific embodiment, Fig. 7 is single bandpass center frequency of the kHz magnitude single-pass with microwave photon filter
Characteristic that rate is tunable, centre frequency fpassRespectively 5GHz, 10GHz, 15GHz, 20GHz, 25GHz, 30GHz, 35GHz,
40GHz, the present invention have many advantages, such as regulable center frequency, Out-of-band rejection than high.
In the embodiments of the present disclosure, single-frequency Brillouin optical fiber laser 700 can also be realized by other schemes, for example,
As shown in figure 8, playing frequency selection in single-frequency Brillouin optical fiber laser 700 with the optic fiber ring-shaped cavity of stabilization (by the 4th
Photo-coupler 730 and the 5th photo-coupler 740 and fiber optic loop composition) it can be by Fiber Grating Based Fabry-Perot Resonator (by optical fiber
The first fiber grating 770, the second fiber grating 780 composition of the high reflectance connected) substitution.In addition, in order to reduce list
The exciting power threshold value of frequency Brillouin optical fiber laser 700, can increase EDFA in resonant cavity.To single in the embodiment of the present disclosure
The improvement project of frequency Brillouin optical fiber laser 700 no longer repeats one by one.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
It describes in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done, such as: by the single-frequency in the present invention
Brillouin optical fiber laser is realized otherwise；The high non-linearity light of stimulated Brillouin scattering will be used to generate in the present invention
Fibre is by the optical fiber of other types or by other types of integrated light guides such as chalcogenide (chalcogenide) optical waveguides
Instead of；Etc., it should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of kHz magnitude single-pass band microwave photon filter, comprising: laser (100), the first photo-coupler (200), unilateral
Band suppressed carrier modulation module (300), single sideband modulation module (400), microwave signal source (500), the first image intensifer, second
Image intensifer, the second photo-coupler (600), single-frequency Brillouin optical fiber laser (700), photodetector (800) and vector net
Network analyzer (900), in which:
Generating frequency by laser (100) is fcLaser, beam of laser and are divided into after the first photo-coupler (200)
Two beam laser, the beam of laser enter SSSC Single Sideband Suppressed Carrier modulation module (300), and the second beam laser enters unilateral
Band modulation module (400)；
The frequency of microwave signal source (500) output is fpMicrowave signal pass through SSSC Single Sideband Suppressed Carrier modulation module (300) modulate
Onto beam of laser, SSSC Single Sideband Suppressed Carrier modulated signal is formed, the SSSC Single Sideband Suppressed Carrier modulated signal includes first
Upper side band fc+fp, the first upper side band fc+fpThe first image intensifer, the second photo-coupler (600) is passed sequentially through to enter later
Single-frequency Brillouin optical fiber laser (700), the first upper side band fc+fpPower be less than single-frequency Brillouin optical fiber laser
(700) exciting power threshold value forms the gain that three dB bandwidth is kHz magnitude in single-frequency Brillouin optical fiber laser (700)
Spectrum, the centre frequency of gain spectral are fc+fp-fB, three dB bandwidth is Δ fSFBFL, wherein fBFor Brillouin shift；
The frequency of vector network analyzer (900) output is fRFFrequency sweep microwave signal pass through single sideband modulation module (400) adjust
It makes onto the second beam laser, forms single sideband modulated signal, the single sideband modulated signal includes light carrier fcWith the second top
Band fc+fRF, the light carrier fcWith the second upper side band fc+fRFPass sequentially through the second image intensifer, the second photo-coupler (600) it
Enter single-frequency Brillouin optical fiber laser (700) afterwards, the light carrier fcPower be greater than single-frequency Brillouin optical fiber laser
(700) exciting power threshold value, inspiring frequency is fc-fBLaser；The second upper side band fc+fRFOptical power be located at institute
Under the exciting power threshold value for stating single-frequency Brillouin optical fiber laser (700), backscatter signal is generated, when the back scattering
The frequency of signal is in the first upper side band fc+fpWhen in the frequency range of the gain spectral of generation, obtains gain and be amplified, swash
Laser signal is issued, and is f with frequencyc-fBLaser in photodetector (800) beat frequency, generate microwave signal；
The microwave signal that the photodetector (800) generates is inputted into vector network analyzer (900), obtains the microwave light
The frequency response characteristic of subfilter.
2. kHz magnitude single-pass band microwave photon filter according to claim 1, which is characterized in that the filter
Single-pass mid-band frequency fpassEqual to fp；The three dB bandwidth Δ f of the filterpassEqual to the single-frequency Brillouin optical fiber laser
(700) the three dB bandwidth Δ f of gain cavitySFBFL。
3. kHz magnitude single-pass band microwave photon filter according to claim 1, which is characterized in that first optocoupler
The splitting ratio of clutch (200) is 50%: 50%, and the splitting ratio of second photo-coupler (600) is 50%: 50%.
4. kHz magnitude single-pass band microwave photon filter according to claim 1, which is characterized in that in the single-frequency cloth
Deep optical fiber laser (700) includes: sequentially connected optical circulator (710), third photo-coupler (720), the 4th photo-coupler
(730), the 5th photo-coupler (740), optoisolator (750), highly nonlinear optical fiber (760), and the highly nonlinear optical fiber
(760) it is connect with the optical circulator (710), constitutes an optical circuit, form an optical resonator.
5. kHz magnitude single-pass band microwave photon filter according to claim 4, which is characterized in that the third optocoupler
The splitting ratio of clutch (720) is 50%: 50%, and the splitting ratio of the 4th photo-coupler (730) is x%: (100-x) %, institute
The splitting ratio for stating the 5th photo-coupler (740) is x%: (100-x) %, wherein x >=90.
6. kHz magnitude single-pass band microwave photon filter according to claim 5, which is characterized in that the 4th optocoupler
Clutch (730) and the 5th photo-coupler (740) constitute optic fiber ring-shaped cavity；
4th photo-coupler (730) includes port four or two (732) and port four or four (734)；5th photo-coupler
It (740) include port five or two (742) and port the May 4th (744)；
Port four or two (732) and port five or two (742) are attached by optical fiber, by optical fiber by port four or four (734) with
Port the May 4th (744) is attached, and constitutes the optic fiber ring-shaped cavity；
Ratio through 730 beam splitting of the 4th photo-coupler is light beam, the ratio through the 5th photo-coupler (740) beam splitting of (100-x) %
Example is that the light beam of x% transmits in fiber optic loop an actor's rendering of an operatic tune.
7. kHz magnitude single-pass band microwave photon filter according to claim 6, which is characterized in that the fiber annular
The free spectral limit FSR1 of the chamber and three dB bandwidth Δ f of formantringMeet following condition:
FSR1≥ΔfB
Δfring≤FSR2
Wherein, Δ fBFor the three dB bandwidth of the brillouin gain spectrum of the highly nonlinear optical fiber (760), FSR2 is in the single-frequency cloth
The mode spacing of deep optical fiber laser (700), also, the chamber of the optic fiber ring-shaped cavity is long less than 8 meters.
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