CN105607302A - Tunable single-passband microwave photonic filter based on Brillouin optical carrier recovery - Google Patents
Tunable single-passband microwave photonic filter based on Brillouin optical carrier recovery Download PDFInfo
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- 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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Abstract
The invention discloses a tunable single-passband microwave photonic filter based on Brillouin optical carrier recovery. The tunable single-passband microwave photonic filter comprises a tunable laser, an optical coupler, a first optical amplifier, a second optical amplifier, a first optical circulator, a second optical circulator, first-section single-mode optical fibers, second-section single-mode optical fibers, a first optical polarization controller, a second optical polarization controller, a Mach-Zehnder modulator, an optical fiber Fabry-Perot filer, an optical isolator, a high-speed photoelectric detector and an electric vector network analyzer, wherein the first-section single-mode optical fibers and the second-section single-mode optical fibers are each wound together in a compound mode. By means of the tunable single-passband microwave photonic filter based on the Brillouin optical carrier recovery, the microwave photonic filter with single-passband frequency responses can be achieved, the wavelength of outgoing light of the tunable laser can be changed, and the broadband of the filtering passband of the microwave photonic filter can be tunable.
Description
Technical field
The present invention relates to fiber optic communication and microwave photon signal process field, relate in particular to a kind of based on being subject toSwash the microwave photon filter of Brillouin scattering.
Background technology
The relative conditional electronic microwave filter of microwave photon filter has low-loss, high bandwidth, anti-electricityMagnetic disturbance, the advantage such as tunable and reconfigurability flexibly, at radar, electronic warfare system and wirelessThe communications field has caused research widely and application. Traditional microwave photon filter is when discreteBetween signal processing structure, there is the problem of multiple harmonic passband in its frequency response, but many shouldWith in all need single-pass band microwave filter to suppress scope to obtain wide frequency, avoid spectrum overlapping.
Therefore, many methods and technology are all at the free spectral range of making great efforts to expand microwave photon filterOr directly realize single oscillatory response. Wherein increase Dare interferometer or two-dimentional liquid crystal on silicon based on MachThe wide spectrum light source spectrum cutting technique of switch arrays, can solve the periodicity filter that discrete delay structure causesRipple passband, but Mach increases Dare interferometer to surrounding environment and responsive to temperature, and two-dimentional liquid crystal on silicon is openedArray structure complicated carrier wave depression effect simultaneously in pass has seriously limited the frequency tunability of wave filter; BasePhase-modulation in trap toroidal cavity resonator, phase shift optical fiber Bragg grating, stimulated Brillouin scattering arrivesIntensity modulated switch technology, can realize the filtering of light territory or be amplified to reflecting of microwave photon filter electroresponsePenetrate, but the stability of toroidal cavity resonator and notch bandwidth seriously limit this microwave photon filterAvailability, the pass band width of phase shift optical fiber Bragg grating has limited the tunable range of wave filter, andThe filtering bandwidth of the microwave photon filter based on stimulated Brillouin scattering is fixing brillouin gainBandwidth, the reconfigurability of wave filter is poor.
In recent years, the microwave photon filter recovering based on light carrier owing to thering is single-pass band, broadband canThe advantage such as tuning, is suggested and studies, and the principle of this microwave photon filter is to utilize optical filter filterRipple obtains a sideband of phase-modulation or intensity modulated, then utilizes excited Brillouin in optical fiber to fall apartThe frequency-selecting amplification of penetrating effect or DFB-SOA recovers by the flashlight carrier wave of filtering, thereby obtainsOptical filter passband, with interior microwave signal, is realized the direct mapping in Dao electricity territory, light territory, but existingThe microwave photon filter construction complexity of recovering based on Brillouin's carrier wave, utilizes light polarization modulator, rises partiallyDevice and Polarization Controller form complicated shift frequency device, need an external microwave source to control Brillouin's pumpThe frequency shift amount of Pu light, need simultaneously two optical band pass filters realize shift frequency sideband spatially selecting filtering andThe optical SSB modulation of RF flashlight, this microwave photon filter, except complex structure, is excited in optical fiberBrillouin shift amount is also relevant with stress, the temperature environment of optical carrier wavelength, optical fiber, due to BrillouinGain bandwidth is very narrow, so the microwave photon filter construction recovering based on Brillouin's carrier wave of report existsIn work and tuning process, also need not stop regulating pump light frequency shift amount with ensure flashlight carrier wave inIn brillouin gain bandwidth. And the microwave photon filter recovering based on DFB-SOA light carrier needsExpensive tunable optical bandpass filter is realized the tuning of microwave photon filter.
Patent utilization Brillouin laser of the present invention produces the laser of lower shift frequency as the light of microwave signalCarrier wave, then uses the not laser of shift frequency to recover by the filtering of Fabry-perot optical fiber wave filter as Brillouin's pump lightFlashlight carrier wave, thereby realize the filtering of light territory to the mapping of electric territory filtering, due to lower shift frequency with carryRipple recovers two sections of optical fiber after-combustion used on same fiber reel, and its temperature is consistent with ambient stress, soBrillouin's pump light and flashlight carrier adaptive meet Brillouin's frequency amount in optical fiber, patent of the present inventionThe single-pass band microwave photon filter proposing is logical by conditioning signal light carrier and Fabry-perot optical fiber wave filterThe spacing of mid-band frequency, can realize the adjustable continuously of this microwave photon filter filter pass band.
Summary of the invention
Patent of the present invention is mainly for solving conventional discrete delay structure microwave photon filter periodicallyThe problem of filter pass band, also needs to solve existing Brillouin's carrier wave and recovers microwave photon filter knot simultaneouslyStructure complexity, the carrier wave that in work and tuning process, Brillouin shift quantitative change causes recovers stability and asksTopic.
In order to solve the problems of the technologies described above, patent of the present invention adopts following technical scheme.
The tunable single passband microwave photon filter recovering based on Brillouin light carrier wave, its bagDraw together:
Tunable laser 1, for generation of the laser of tunable wave length; Photo-coupler 2, for inciting somebody to actionThe laser that tunable laser 1 is exported is with the ratio beam splitting of 50%: 50%, respectively from b, the output of c port;The first image intensifer 3, for amplifying the luminous power of beam of laser, exceedes it and in optical fiber, is excited clothIn the threshold value of deep scattering; The first optical circulator 4, for controlling the one-way transmission of laser, by the first bundleLaser input first paragraph single-mode fiber 5, swashs backward scattered lower shift frequency in first paragraph single-mode fiber 5Light is inputted the first optical polarization controller 6; First paragraph single-mode fiber 5, as stimulated Brillouin scatteringGain media, produces the backward scattered frequency laser that moves down; The first optical polarization controller 6, for controllingMove down the polarization state of frequency laser; Mach increases Dare modulator 7, and microwave signal is modulated to lower shift frequencyOn laser carrier; Fabry-perot optical fiber wave filter 8, its periodic filter passband obtains bilateral for light filteringUpper side band (or lower sideband) with modulation signal; Optoisolator 9, for controlling the unidirectional biography of laserDefeated, avoid backward transmission, reflection or scattered light to enter Fabry-perot optical fiber wave filter 8; Second segment single-mode opticsFibre 10, as the gain media of stimulated Brillouin scattering, at the second bundle of tunable laser 1 beam splittingUnder the pumping effect of laser, recover the light carrier of microwave modulation signal; The second optical circulator 11, forControl the one-way transmission of laser, pumping laser is inputted to second segment single-mode fiber 10, simultaneously by single-side beltMicrowave modulation signal outputs to high-speed photodetector 12; High-speed photodetector 12, for signalOpto-electronic conversion, obtain the microwave signal in this microwave photon filter filter pass band; The second light amplificationDevice 13, for amplifying the second luminous power of restrainting laser of tunable laser 1 beam splitting; The second light polarizationController 14, for controlling the second bundle laser, i.e. the polarization state of the pump light of stimulated Brillouin scattering,Improve the efficiency that Brillouin scattering carrier wave recovers; Electric vector Network Analyzer 15, micro-for launching frequency sweepRipple signal arrives microwave photon filter of the present invention, the microwave signal of receiving system output simultaneously, therebyTo the filtering characteristic of microwave photon filter of the present invention.
In such scheme, the output port of described tunable laser 1 connects the input of photo-coupler 2Port a, the output port b of photo-coupler 2 connects the input port of the first image intensifer 3, firstThe output port of image intensifer 3 connects the input port a of the first optical circulator 4, the first optical circulatorThe output port c that 4 output port b connects first paragraph single-mode fiber 5, the first optical circulators 4 connectsConnect the input port of the first optical polarization controller 6, the output port of the first optical polarization controller 6 connectsMach increases the input port of Dare modulator 7, and the output port that Mach increases Dare modulator 7 connects lightThe input port of fine Fabry-Perot filter 8, the output port of Fabry-perot optical fiber wave filter 8 connects optoisolator9 input port, the output port of optoisolator 9 connects the input port of second segment single-mode fiber 10,The output port of second segment single-mode fiber 10 connects the port b of the second optical circulator 11, second ring of lightThe port c of shape device 11 connects the input port of high-speed photodetector 12; From 1 to 12 wholeLink for realize modulation, light filtering, the light carrier of lower shift frequency, microwave signal of light carrier recover withAnd the demodulation of microwave signal.
In such scheme, the output port c of described photo-coupler 2 connects second image intensifer 13Input port, the output port of the second image intensifer 13 connects the input of the second optical polarization controller 14Port, the output port of the second optical polarization controller 14 connects the input port of the second optical circulator 11A; The luminous power that from 13 to 14 whole link is used for controlling stimulated Brillouin scattering pump light is with inclined to one sideThe state of shaking.
In such scheme, the output of described electric vector Network Analyzer 15 connects Mach and increases Dare tuneThe electrical input of device 7 processed, frequency sweep microwave source is as the modulation signal of electrooptic modulator, high-speed light electrical resistivity surveyThe electric output of surveying device 12 connects the input of electric vector Network Analyzer 15, electric vector network analysisThe system amplitude frequency response that instrument 15 measures is applied to and characterizes this wideband adjustable single-pass band microwave photon filterThe filtering characteristic of ripple device.
In such scheme, described Fabry-perot optical fiber wave filter (FFP) 8 has periodically extremely narrow light filterRipple passband, microwave photon filter system can realize Fabry-perot optical fiber wave filter light filter pass band described in patentTo the direct mapping of electric filter pass band; This Fabry-perot optical fiber wave filter 8 need to have larger freedom simultaneouslySpectral region (FSR), to realize the wideband adjustable of this microwave photon filter.
In such scheme, described first paragraph single-mode fiber 5 and 10 after-combustion of second segment single-mode fiber are sameOn a fiber reel, thereby there is identical stress and environment temperature, so two sections of optical fiber have identicalBrillouin shift, therefore second bundle laser can be by being excited cloth in second segment single-mode fiber 10In deep scattering recover in first paragraph single-mode fiber 5 lower shift frequency flashlight carrier wave.
The present invention is directed to above-mentioned situation, a kind of tunable single recovering based on Brillouin light carrier wave is providedPassband microwave photon filter, has realized Fabry-perot optical fiber wave filter light filter pass band and has arrived microwave filterThe direct mapping of electricity filter pass band; Regulate laser wavelength can realize microwave photon filter filter pass bandCentre frequency adjustable continuously; Due to after-combustion two section single-mould fibers together have consistent stress withEnvironment temperature, so this two section single-mould fiber has identical Brillouin shift amount, therefore Brillouin swashsThe lower shift frequency light carrier that light device produces can be directly extensive by Brillouin's pump light in second segment single-mode fiberMultiple, therefore, in regulating laser wavelength, Brillouin's carrier wave recovers also can self adaptation brillouin frequencyThe variation of the amount of moving, thus Brillouin carrier wave simplified and recovered the structure of microwave photon filter, improveStability in system works and tuning process.
Brief description of the drawings
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with concrete realityExecute example, and with reference to accompanying drawing, the present invention is described in more detail, wherein:
Fig. 1 is the tunable single passband microwave photon recovering based on Brillouin light carrier wave provided by the inventionThe system construction drawing of wave filter;
Fig. 2 is the principle schematic of wideband adjustable single-pass band microwave photon filter of the present invention.
Description of reference numerals
1 tunable laser 2 photo-couplers
3 first image intensifer 4 first optical circulators
5 first paragraph single-mode fiber 6 first optical polarization controllers
7 Mach increase Dare modulator 8 Fabry-perot optical fiber wave filters
9 optoisolator 10 second segment single-mode fibers
11 second optical circulator 12 high-speed photodetectors
13 second image intensifer 14 second optical polarization controllers
15 electric vector Network Analyzers
Detailed description of the invention
It shown in Fig. 1, is the tunable single passband microwave recovering based on Brillouin light carrier wave provided by the inventionPhoton filter, it comprises: tunable laser 1, photo-coupler 2, the first image intensifer 3 withThe second image intensifer 13, the first optical circulator 4 together with the second optical circulator 11, after-combustionOne section single-mould fiber 5 and second segment single-mode fiber 10, the first optical polarization controller 6 and the second light polarizationController 14, Mach increase Dare modulator 7, Fabry-perot optical fiber wave filter 8, optoisolator 9, at a high speedPhotodetector 12, electric vector Network Analyzer 15.
Wherein, tunable laser 1, for generation of the laser of tunable wave length, its output port connectsMeet the port a of photo-coupler 2;
Photo-coupler 2, divides with the ratio of 50%: 50% for the laser that tunable laser 1 is exportedBundle, a road is from the output of b port, and lower shift frequency is as the light carrier of microwave signal, and another road is from c portOutput, the pump light recovering as microwave signal light carrier;
The first image intensifer 3, for amplifying the luminous power of beam of laser, exceedes in optical fiber it and is subject toThe threshold value that swashs Brillouin scattering, its output port connects the first optical circulator 4 port a;
The first optical circulator 4, for controlling the one-way transmission of laser, by beam of laser input firstSection single-mould fiber 5, inputs the first light by the backward scattered frequency laser that moves down in first paragraph single-mode fiber 5Polarization Controller 6, the first optical circulator 4 port b connect one end of first paragraph single-mode fiber 5, endMouth c connects the input port of the first optical polarization controller 6;
First paragraph single-mode fiber 5, as the gain media of stimulated Brillouin scattering, produces back scatteringMove down frequency laser, its Brillouin shift amount is consistent with second segment single-mode fiber 10;
The first optical polarization controller 6, for controlling the polarization state that moves down frequency laser, improves Mach and increases moralThe Electro-optical Modulation efficiency of your modulator 7, its output port connects the input of Mach increasing Dare modulator 7Port;
Mach increases Dare modulator 7, microwave signal is modulated on the laser carrier of lower shift frequency, and it is defeatedOutbound port connects the input port of Fabry-perot optical fiber wave filter 8;
Fabry-perot optical fiber wave filter 8, its periodic filter passband obtains double sideband modulation letter for light filteringNumber upper side band (or lower sideband), its output port connects the input port of optoisolator 9;
Optoisolator 9, for controlling the one-way transmission of laser, avoids backward transmission, reflection or scatteringLight enters Fabry-perot optical fiber wave filter 8, and its output port connects the input of second segment single-mode fiber 10Mouthful;
Second segment single-mode fiber 10, as the gain media of stimulated Brillouin scattering, at tunable laserUnder the pumping effect of the second bundle laser of device 1 beam splitting, recover the light carrier of microwave modulation signal, it is defeatedOutbound port connects the port b of the second optical circulator 11;
The second optical circulator 11, for controlling the one-way transmission of laser, inputs second segment by pumping laserSingle-mode fiber 10 outputs to high-speed photodetector 12 by single-side belt microwave modulation signal simultaneously, itsPort a connects the output port of the second optical polarization controller 14, and port c connects high speed optoelectronic and surveysThe input port of device 12;
High-speed photodetector 12, for the opto-electronic conversion of signal, obtains this microwave photon filter filterMicrowave signal in ripple passband;
The second image intensifer 13, for amplifying the second light merit of restrainting laser of tunable laser 1 beam splittingRate, its input port connects the port c of photo-coupler 2, and output port connects the second light polarization controlThe input port of device 14;
The second optical polarization controller 14, for controlling the second bundle laser, the i.e. pump of stimulated Brillouin scatteringPu polarisation of light state, improves the efficiency that Brillouin scattering carrier wave recovers, and its output port connects the second lightThe port a of circulator 11;
Electric vector Network Analyzer 15, for launching frequency sweep microwave signal to microwave photon filtering of the present inventionDevice, the microwave signal of simultaneously receiving system output, thus obtain the filter of microwave photon filter of the present inventionWave property, it is defeated that the output of electric vector Network Analyzer 15 connects Mach electricity that increases Dare modulator 7Enter end, frequency sweep microwave source is as the modulation signal of electrooptic modulator, the electricity of high-speed photodetector 12Output connects the input of electric vector Network Analyzer 15.
Shown in Fig. 2, be to the present invention is based on the tunable single passband microwave photon filter that Brillouin light carrier wave recoversThe principle schematic of ripple device, wherein figure (1) represents that tunable laser Output of laser is at first paragraph listThe laser that produces lower shift frequency under the effect of stimulated Brillouin scattering effect in mode fiber 5 is as microwave signalLight carrier; Figure (2) represents that light carrier increases different frequency microwave letter in Dare modulator 7 at MachNumber modulation under obtain double sideband modulation signal; Figure (3) represents the flashlight process optical fiber after modulationObtain lower sideband and the light carrier having suppressed after Fabry-Perot filter filtering; Figure (4) is illustrated in secondFlashlight in section single-mould fiber 10 after filtering recovers under the amplification of Brillouin's pump lightLight carrier; Figure (5) is illustrated in the light carrier and the light filtering that in high-speed photodetector 12, recover and obtainsTo lower sideband signal beat frequency obtain microwave signal, realized the mapping of light territory filtering to electric territory filtering,The spacing of conditioning signal light carrier and Fabry-perot optical fiber filter passband centre frequency, can realize this microwave lightSubfilter filter pass band adjustable continuously.
Above-described specific embodiment, carries out object of the present invention, technical scheme and beneficial effectFurther description, institute it should be understood that the foregoing is only specific embodiments of the invention and, be not limited to the present invention, within the spirit and principles in the present invention all, any repairing of doingProtection scope of the present invention changes, be equal to replacement, improvement etc., within all should be included in.
Claims (4)
1. the tunable single passband microwave photon filter recovering based on Brillouin light carrier wave, bagDraw together:
Tunable laser (1), photo-coupler (2), the first image intensifer (3), the first ring of light shapeDevice (4), first paragraph single-mode fiber (5), the first optical polarization controller (6), Mach increases Dare modulationDevice (7), Fabry-perot optical fiber wave filter (8), optoisolator (9), second segment single-mode fiber (10),The second optical circulator (11), high-speed photodetector (12), the second image intensifer (13), secondOptical polarization controller (14), electric vector Network Analyzer (15); Wherein,
The output port of described tunable laser (1) connects the input port (a) of photo-coupler (2),The output port (b) of photo-coupler (2) connects the input port of the first image intensifer (3), theThe output port of one image intensifer (3) connects the input port (a) of the first optical circulator (4), theThe output port (b) of one optical circulator (4) connects first paragraph single-mode fiber (5), the first ring of light shapeThe output port (c) of device (4) connects the input port of the first optical polarization controller (6), firstThe output port of optical polarization controller (6) connects the input port of Mach increasing Dare modulator (7),Mach increases the input port of the output port connection Fabry-perot optical fiber wave filter (8) of Dare modulator (7),The output port of Fabry-perot optical fiber wave filter (8) connects the input port of optoisolator (9), light isolationThe output port of device (9) connects the input port of second segment single-mode fiber (10), second segment single modeThe output port of optical fiber (10) connects the port (b) of the second optical circulator (11), the second ring of light shapeThe port (c) of device (11) connects the input port of high-speed photodetector (12); From (1) to(12) whole link for realize light carrier lower shift frequency, microwave signal modulation, light filtering,The demodulation of light carrier recovery and microwave signal;
The output port (c) of photo-coupler (2) connects the input port of the second image intensifer (13),The output port of the second image intensifer (13) connects the input port of the second optical polarization controller (14),The output port of the second optical polarization controller (14) connects the input port of the second optical circulator (11)(a); The whole link of from (13) to (14) is for controlling the light of stimulated Brillouin scattering pump lightPower and polarization state;
The output of electric vector Network Analyzer (15) connects the electricity of Mach increasing Dare modulator (7)Input, frequency sweep microwave source is as the modulation signal of electrooptic modulator, high-speed photodetector (12)Electric output connect the input of electric vector Network Analyzer (15), electric vector Network Analyzer (15)The system amplitude frequency response measuring is applied to and characterizes this wideband adjustable single-pass band microwave photon filterFiltering characteristic.
2. the tunable single passband microwave light of recovering based on Brillouin light carrier wave as claimed in claim 1Subfilter, is characterized in that, photo-coupler (2) is by the laser of tunable laser (1) outputWith the ratio beam splitting of 50%: 50%, respectively from (b), the output of (c) port.
3. the tunable single passband microwave light of recovering based on Brillouin light carrier wave as claimed in claim 2Subfilter, is characterized in that, Fabry-perot optical fiber wave filter (8) is narrow band fiber Fabry-Perot filter.
4. the tunable single passband microwave light of recovering based on Brillouin light carrier wave as claimed in claim 2Subfilter, is characterized in that, first paragraph single-mode fiber (5) and second segment single-mode fiber (10)After-combustion is on same fiber reel.
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| CN106654472A (en) * | 2016-12-28 | 2017-05-10 | 西南交通大学 | Tunable ultra narrow band microwave photonic band-pass filter |
| CN106941238A (en) * | 2017-05-16 | 2017-07-11 | 中国电子科技集团公司第四十研究所 | Super narrowband linear tunable filtering method, wave filter |
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