CN103715480B - A kind of single tape of ultra high quality factor leads to tunable microwave photon filter - Google Patents

A kind of single tape of ultra high quality factor leads to tunable microwave photon filter Download PDF

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CN103715480B
CN103715480B CN201410025426.2A CN201410025426A CN103715480B CN 103715480 B CN103715480 B CN 103715480B CN 201410025426 A CN201410025426 A CN 201410025426A CN 103715480 B CN103715480 B CN 103715480B
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frequency
signal
intensity modulator
filter
optical
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CN103715480A (en
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董玮
肖永川
陈维友
张歆东
刘彩霞
阮圣平
周敬然
郭文滨
沈亮
温善鹏
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Jilin University
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Jilin University
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Abstract

A kind of single tape of ultra high quality factor leads to tunable microwave photon filter, belong to Microwave photonics technical field, the single tape being specifically related to a kind of ultra high quality factor realized based on highly nonlinear optical fiber stimulated Brillouin scattering effect and gain spectral and loss spectra superimposing technique leads to tunable microwave photon filter.Be made up of laser, the first optical coupler, phase-modulator, optical isolator, vector network analyzer, highly nonlinear optical fiber, first pair of parallel intensity modulator, the first intensity modulator, the second optical coupler, the first optical filter, the second optical filter, second pair of parallel intensity modulator, the second intensity modulator, the 3rd intensity modulator, the first erbium-doped fiber amplifier, the second erbium-doped fiber amplifier, the 3rd optical coupler, optical circulator and photodetector.Present invention decreases the three dB bandwidth of filter, and add the frequency tuning range of filter, thus add the Q value of filter.

Description

A kind of single tape of ultra high quality factor leads to tunable microwave photon filter
Technical field
The invention belongs to Microwave photonics technical field, the single tape being specifically related to a kind of ultra high quality factor realized based on highly nonlinear optical fiber stimulated Brillouin scattering effect and gain spectral and loss spectra superimposing technique leads to tunable microwave photon filter.
Background technology
Microwave photon filter is the Primary Component that light carries microwave/millimeter wave system, has low-loss, high operate frequency, electromagnetism interference, has tunability and reconfigurability flexibly.Single-pass band, microwave photon filter that is tunable, high quality factor (Q value) are widely used in military affairs, satellite remote sensing, broadband wireless communications and astrosurveillance etc.
Need the occasion of narrow-band filtering to need the microwave photon filter of high q-factor at some, the Q value of filter is higher, and its transfer curve is more precipitous at peak value place, and selecting frequency characteristic is better.The Q value increasing microwave photon filter is the target that scientific research personnel lays siege to always, generally increase Q value by Cascading Methods, EnmingXu achieves the cascade of iir filter and iir filter, propose to introduce in an iir filter wavelength convert wherein and successfully overcome interference in two iir filters between light signal, obtain stable filter freguency response, solving two iir filters can not the difficult problem of cascade, by suitably arranging the different FSR of two iir filters, due to vernier caliper effect, free spectral limit (FSR) after cascade increases significantly, thus Q value is increased significantly, 3338(EnmingXu can be reached, XinliangZhang, LinaZhou, YuZhang, YuanYu, XiangLi, andDexiuHuang, Ultrahigh-QmicrowavephotonicfilterwithVerniereffectandwa velengthconversioninacascadedpairofactiveloops, OpticsLetters, 2010, 35 (8): 1242-1244).JieLiu infinite impulse response (IIR) filter of two cascades constitutes the microwave photon filter of high q-factor, adopt electro-optical feedback loop, overcome optical coherence problem, quality factor reach 4895.31 (JieLiu, NanGuo, ZhaohuiLi, ChangyuanYu, andChaoLv, Anultrahigh-QmicrowavephotonicfilterwithtunableQvalueuti lizingcascadedoptical-electricalfeedbackloops, OPTICSLETTERS, 2013,38 (21): 4304-4307).Microwave photon filter based on stimulated Brillouin scattering effect has single-pass band, tunable and high out-of-side rejection ratio, the three dB bandwidth of filter is relevant with the bandwidth that stimulated Brillouin scattering is composed, ZhangWeiwei constructs the microwave photon filter of single-pass band based on phase-modulation and stimulated Brillouin scattering effect, the tuning range of centre frequency is 1 to 20GHz, three dB bandwidth is 20MHz, Q value is close to 1000(WeiweiZhangandRobertA.Minasian, WidelyTunableSingle-PassbandMicrowavePhotonicFilterBased onStimulatedBrillouinScattering, IEEEPhotonicsTechnologyLetters, 2011, 23 (23): 1775-1777).
Summary of the invention
The single tape that the object of this invention is to provide a kind of ultra high quality factor realized based on highly nonlinear optical fiber stimulated Brillouin scattering effect and gain spectral and loss spectra superimposing technique leads to tunable microwave photon filter.
The structure of the microwave photon filter of high q-factor of the present invention as shown in Figure 1, is made up of laser, the first optical coupler, phase-modulator, optical isolator, vector network analyzer, highly nonlinear optical fiber, first pair of parallel intensity modulator, the first intensity modulator, the second optical coupler, the first optical filter, the second optical filter, second pair of parallel intensity modulator, the second intensity modulator, the 3rd intensity modulator, the first erbium-doped fiber amplifier, the second erbium-doped fiber amplifier, the 3rd optical coupler, optical circulator and photodetector.
Intensity modulated in the present invention is all small signal modulation situation, and except the upper and lower sideband of single order and carrier wave, all the other sidebands are left in the basket.
Laser output frequency is f csimple signal (Fig. 2 (1)) be divided into two through the first optical coupler, the light signal wherein going up branch road is sent in phase-modulator as light carrier, and the frequency that comprises exported by vector network analyzer frequency sweep is f ma series of small size microwave signals to be filtered with certain frequency bandwidth be loaded on light carrier by phase-modulator, (Fig. 2 (2) represents that its medium frequency is f for a series of single order upper sideband that the phase place exported after phase-modulator is contrary, intensity is equal and lower sideband signal msignal madulation after frequency spectrum) enter into highly nonlinear optical fiber through optical isolator; First the light signal (Fig. 2 (3)) of the lower branch road that the first optical coupler exports is f through first pair of parallel intensity modulator by frequency 0microwave signal modulation, adjustment first pair of parallel intensity modulator DC offset voltage, make its be operated in carrier wave suppress single-side belt state, make it only export single order upper sideband f c+ f 0signal (Fig. 2 (4)), it is f that this upper side band signal continues to modulate by frequency through the first intensity modulator bsignal madulation (f balso be the excited Brillouin frequency shift amount of highly nonlinear optical fiber simultaneously), adjust the DC offset voltage of the first intensity modulator, make it be operated in the double-side band output state of carrier wave suppression, it exports the upper and lower sideband of single order and is respectively f c+ f 0+ f band f c+ f 0-f bthe signal of (Fig. 2 (5)), then the upper and lower sideband signals of this single order is divided into two-way by the second optical coupler, and wherein upper side band signal filters through the first optical filter by the signal of a branch road, and remaining frequency is f c+ f 0-f blower sideband signal (Fig. 2 (6)), frequency is f c+ f 0-f bsignal to be sent in second pair of parallel intensity modulator by frequency be 2f bsignal modulate further, the direct current (DC) bias of adjustment second pair of parallel intensity modulator, the single-side band modulation state making it be operated in carrier wave to suppress, export and be only single order lower sideband, thus output frequency is f c+ f 0-3f bsignal (Fig. 2 (7)), then this signal to be fed in the second intensity modulator by frequency is 2f bsignal modulate further, obtaining frequency is f c+ f 0-f b, f c+ f 0-3f band f c+ f 0-5f bthree signals (Fig. 2 (8)), then this signal to be fed in the 3rd intensity modulator by frequency is f l(f laccording to wanting the bandwidth of the filter realized and the frequency values that sets) signal modulates further, and the operating state of the 3rd intensity modulator is set to the double-sideband modulation that carrier wave suppresses, then obtaining frequency is f c+ f 0-f b+ f land f c+ f 0-f b-f l, f c+ f 0-3f b+ f land f c+ f 0-3f b-f land f c+ f 0-5f b+ f land f c+ f 0-5f b-f lsix signals (Fig. 2 (9)), the part as pump signal is fed to the first erbium-doped fiber amplifier by these six signals; Two tributary signals that second optical coupler exports are carried out filtering by the second optical filter, and remaining frequency is f c+ f 0+ f bsignal (Fig. 2 (10)), be fed in the second erbium-doped fiber amplifier; First erbium-doped fiber amplifier and the second erbium-doped fiber amplifier are the luminous powers in order to adjust pump light, with the reduction of the gain peak caused when compensating gain spectrum and loss spectra superposition.First erbium-doped fiber amplifier and the second erbium-doped fiber amplifier output packet are f containing frequency content c+ f 0+ f b, f c+ f 0-f b+ f land f c+ f 0-f b-f l, f c+ f 0-3f b+ f land f c+ f 0-3f b-f land f c+ f 0-5f b+ f land f c+ f 0-5f b-f lsignal, by 2 ports inputs of optical circulator after the 3rd optical coupler exports, export from 1 port of optical circulator and enter into high non-linearity light, produce the pump signal of stimulated Brillouin scattering effect as highly nonlinear optical fiber.The signal through phase-modulation that optical isolator exports and these pump signal interact in highly nonlinear optical fiber, after there is stimulated Brillouin scattering, by 1 port input of circulator, export from 3 ports of circulator, then send into vector network analyzer after carrying out opto-electronic conversion by photodetector, thus detection to obtain frequency be f mmicrowave signal.
The high q-factor of filter is realized by the three dB bandwidth of reduction output spectrum, the process that filter bandwidht narrows makes to stack up with the gain spectral produced by increasing pump light introducing loss spectra, just makes gain spectral narrow on original basis by superposition.Specific implementation process is as follows: the frequency of laser output signal is f cif there is frequency to be f in signal to be filtered mthe signal of (being exported by network analyzer), then obtain equal and opposite in direction, single order upper and lower rank upper side band signal f that phase place is contrary after phase-modulation c+ f mand f c-f m, these two sideband signals are sent in high non-linearity light after optical isolator; Pump signal is f c+ f 0+ f b, f c+ f 0-f b+ f land f c+ f 0-f b-f l, f c+ f 0-3f b+ f land f c+ f 0-3f b-f land f c+ f 0-5f b+ f land f c+ f 0-5f b-f l, wherein f c+ f 0+ f bthis pump signal is in frequency f c+ f 0place produces gain spectral, in frequency f c+ f 0+ 2f bplace produces loss spectra; Pump signal f c+ f 0-f b-f lin frequency f c+ f 0-2f b-f lplace produces gain spectral, in frequency f c+ f 0-f lplace produces loss spectra; Pump signal f c+ f 0-f b+ f lin frequency f c+ f 0-2f b+ f lplace produces gain spectral, in frequency f c+ f 0+ f lplace produces loss spectra; Pump signal f c+ f 0-3f b-f lin frequency f c+ f 0-4f b-f lplace produces gain spectral, in frequency f c+ f 0-2f b-f lplace produces loss spectra; Pump signal f c+ f 0-3f b+ f lin frequency f c+ f 0-4f b+ f lplace produces gain spectral, in frequency f c+ f 0-2f b+ f lplace produces loss spectra; Pump signal f c+ f 0-5f b-f lin frequency f c+ f 0-6f b-f lplace produces gain spectral, in frequency f c+ f 0-4f b-f lplace produces loss spectra; Pump signal f c+ f 0-5f b+ f lin frequency f c+ f 0-6f b+ f lplace produces gain spectral, in frequency f c+ f 0-4f b+ f lplace produces loss spectra (Fig. 2 (11)).In the gain spectral and loss spectra of all generations, f c+ f 0-f b+ f land f c+ f 0-f b-f lthe gain spectral produced and f c+ f 0-3f b+ f land f c+ f 0-3f b-f lthe loss spectra produced offsets completely, f c+ f 0-3f b+ f land f c+ f 0-3f b-f lthe gain spectral produced and f c+ f 0-5f b+ f land f c+ f 0-5f b-f lthe loss spectra produced offsets completely, and pump signal f c+ f 0-f b+ f land f c+ f 0-f b-f lin frequency f c+ f 0+ f land f c+ f 0-f ltwo loss spectras that place produces and pump signal f c+ f 0+ f bin frequency f c+ f 0superimposed this gain spectral that makes of gain spectral that place produces narrows, and the stimulated Brillouin scattering spectrum after treated is as Fig. 2 (12).Owing to adopting multiple pump signal, and the gain spectral produced between them and loss spectra can suitably be offset, because this increasing the frequency tuning range of filter.Work as f m=f 0time, f mthe single order upper side band signal f that signal exports after phase-modulator c+ f mjust in time being in frequency is f c+ f 0place in the gain spectral of overlap-add procedure as Fig. 2 (13), therefore this single order upper side band signal f c+ f mbe enhanced, upper sideband f c+ f mwith lower sideband f c-f mintensity no longer equal, just can detect and obtain frequency is f mmicrowave signal.
By setpoint frequency f lnumerical value, the first and second erbium-doped fiber amplifiers multiplication factor, the width of the gain spectral after can adjusting superposition, makes it the numerical value reaching needs.Because this filter passband is obtained by the gain spectral mapping the generation of stimulated Brillouin scattering effect, so the bandwidth of filter just can be made to narrow by the process that narrows to gain spectral.
By adjusting the frequency f of the input microwave signal of the first double-parallel modulator 0, then the centre frequency of filter output signal will change, thus the frequency realizing microwave photon filter output within the specific limits can be tuning.The Q value of filter equals frequency tuning range and the ratio of the three dB bandwidth of filter, present invention decreases the three dB bandwidth of filter, and adds the frequency tuning range of filter, thus add the Q value of filter.
The present invention selects wavelength to be the laser of 1550nm, and phase-modulator work optical wavelength is 1525nm ~ 1605nm, and bandwidth is 32GHz; The frequency range of network analyzer is 40M ~ 40GHz; Photodetector detective bandwidth is 35GHz; The excited Brillouin gain live width of highly nonlinear optical fiber is Γ b=40MHz, Brillouin shift amount f b=10GHz, length is 1000 meters, and gain and loss peak coefficient are 5; The isolation of optical isolator is greater than 40dB; First pair of parallel intensity modulator intensity modulator bandwidth parallel with second pair is 30GHz, is all operated in the single-side belt output state that carrier wave suppresses; The bandwidth of the first intensity modulator, the second intensity modulator and the 3rd intensity modulator is 32GHz; The wavelength tuning range of the first optical filter and the second optical filter is 1548nm ~ 1552nm, and live width is less than 10GHz; The wave-length coverage of the first erbium-doped fiber amplifier and the second erbium-doped fiber amplifier is 1530 ~ 1560nm, and multiplication factor is greater than 25 times.
F lfor 20MHz, if pump signal f c+ f 0-f b+ f land f c+ f 0-f b-f lin frequency f c+ f 0+ f land f c+ f 0-f lthe peak value of the loss spectra that place produces and pump signal f c+ f 0+ f bin frequency f c+ f 0the ratio that place produces the peak value of gain spectral is γ, and when increasing γ, total gain peak that these three pump signal produce can reduce, and the reduction of peak value can reduce the Out-of-band rejection ratio of filter, thus reduces performance of filter.So need the power increasing pump light in the branch road of pump signal with the first erbium-doped fiber amplifier and the second erbium-doped fiber amplifier, to ensure a stable gain peak, need again increase γ to obtain narrower gain spectral simultaneously.
Accompanying drawing explanation
Fig. 1: high q-factor microwave photon filter construction schematic diagram;
Fig. 2: gain spectral narrows process process schematic;
Fig. 3: without gain during light amplification and loss peak than the gain spectral after superposition time different;
Fig. 4: gain and loss peak are than different and that after superposition, peak value is constant gain spectral;
Fig. 5: gain and loss peak than different and after superposition, peak value is constant time filter passband schematic diagram;
Fig. 6: the tunable output characteristic of filter.
Embodiment
Embodiment 1:
Select the TSL-510 tunable laser of Santec company to make carrier wave light source, setting wavelength is 1550nm(respective frequencies is f c=193.41THz), phase-modulator is the MPZ-LN-40 of Photline company, and work optical wavelength is 1525nm ~ 1605nm, and bandwidth is 32GHz; Network analyzer is the 8722ES vector network analyzer of Agilent, and frequency range is 50M ~ 40GHz; Photodetector is the SD-48 of Imtech, and bandwidth is 35GHz; The highly nonlinear optical fiber of Yangtze Optical Fiber and Cable Company Ltd, excited Brillouin gain live width is Γ b=40MHz, Brillouin shift amount f b=10GHz, length is 1000 meters, and gain and loss peak coefficient are 5; The isolation of optical isolator is greater than 40dB; First pair of parallel intensity modulator intensity modulator parallel with second pair is the MXIQ-LN-40 of Photline company, its bandwidth is 32GHz, first pair of parallel intensity modulator is operated in the single-side belt output state of carrier wave suppression, only export single order upper sideband, second pair of parallel intensity modulator is operated in the single-side belt output state of carrier wave suppression, only exports single order lower sideband; First intensity modulator and the second intensity modulator and the 3rd intensity modulator are the MXAN-LN-40 of Photline company, and bandwidth is 32GHz; First optical filter and the second optical filter are the adjustable light wave-filter of Santec company, and model is OTF-950, and wavelength tuning range is 1548nm to 1552nm, and live width is less than 10GHz; The wave-length coverage of the first erbium-doped fiber amplifier and the second erbium-doped fiber amplifier is 1530 ~ 1560nm, and multiplication factor is greater than 25 times; The radiofrequency signal f of first pair of parallel intensity modulator input 0frequency range be 0.3GHz ~ 30GHz, f 0scope be exactly the frequency tuning range of filter.
Corresponding instrument and equipment is connected by Fig. 1, the wavelength of laser is set as 1550nm, network analyzer reference frequency output is that the microwave signal of 50MHz ~ 40GHz is loaded on light carrier by phase-modulator, and the signal that phase-modulator exports is by entering into highly nonlinear optical fiber after isolator.At another branch road, first the light signal of the 1550nm that laser exports is f through first pair of parallel intensity modulator by frequency 0the microwave signal modulation of=0.3GHz, first pair of parallel intensity modulator is operated in the single-side belt operating state of carrier wave suppression, and its output is only single order upper sideband f c+ f 0, frequency is f c+ f 0signal be input in the first intensity modulator, be excited Brillouin frequency shift amount f by frequency bmicrowave signal modulation, the direct current (DC) bias setting the first intensity modulator is 9V, and the double-side band output state making it be in carrier wave to suppress, output packet is respectively f containing the upper and lower sideband of single order c+ f 0+ f band f c+ f 0-f b, then the upper and lower sideband signals of this single order is divided into two-way by the second optical coupler, and upper side band signal filters through the first optical filter by the signal of one of them branch road, and remaining frequency is f c+ f 0-f bsignal, frequency is f c+ f 0-f bsignal be sent in second pair of parallel intensity modulator, the second pair of parallel intensity modulator is operated in the single-side belt operating state that carrier wave suppresses, and its output is only single order lower sideband f c+ f 0-3f b, frequency is f c+ f 0-3f bsignal be input in the second intensity modulator, the DC offset voltage adjusting the second intensity modulator is 4.5V, and obtaining frequency is f c+ f 0-f b, f c+ f 0-3f band f c+ f 0-5f b, they to be admitted in the 3rd intensity modulator by frequency is f lthe signal of=20MHz is modulated further, and the DC offset voltage of adjustment the 3rd intensity modulator is 9V, and make it be operated in the double-side band output state of carrier wave suppression, the 3rd intensity modulator output frequency is f c+ f 0-f b+ f land f c+ f 0-f b-f l, f c+ f 0-3f b+ f land f c+ f 0-3f b-f land f c+ f 0-5f b+ f land f c+ f 0-5f b-f lsix sideband signals.Another signal exporting branch road of second optical coupler is carried out filtering by the second optical filter, and remaining frequency is f c+ f 0+ f bsignal, the multiplication factor of the first erbium-doped fiber amplifier and the second erbium-doped fiber amplifier is set to 19 times and 24 times, the reduction of gain peak caused when superposing with compensating gain spectrum and loss spectra.After the first Erbium-Doped Fiber Amplifier and the second erbium-doped fiber amplifier are amplified, comprising frequency content is f c+ f 0+ f b, f c+ f 0-f b+ f land f c+ f 0-f b-f l, f c+ f 0-3f b+ f land f c+ f 0-3f b-f land f c+ f 0-5f b+ f land f c+ f 0-5f b-f lsignal, through the 3rd optical coupler export after by optical circulator 2 ports input, from optical circulator 1 port export enter into high non-linearity light, as the pump signal of the stimulated Brillouin scattering effect of highly nonlinear optical fiber.Phase-modulator exports a series of equal and opposite in direction, the upper and lower sideband signals of single order that phase place is contrary, and its medium frequency is f c+ f m(f m=f 0) upper side band signal due to pump signal f c+ f 0-f b+ f l, f c+ f 0-f b-f land f c+ f 0+ f bthe centre frequency f of the gain spectral through superposition produced c+ f 0unanimously, therefore frequency is f c+ f m(f m=f 0) upper side band signal will be enhanced, thus frequency is f c+ f mand f c-f mthe intensity of the upper and lower sideband of single order no longer equal, frequency is f mmicrowave signal can filtered output.
Pump signal f c+ f 0-f b+ f land f c+ f 0-f b-f lin frequency f c+ f 0+ f land f c+ f 0-f lthe peak value of the loss spectra that place produces and pump signal f c+ f 0+ f bin frequency f c+ f 0the ratio γ that place produces the peak value of gain spectral is 0,0.3,0.5,0.7 and 0.792, when the multiplication factor of the first erbium-doped fiber amplifier and the second erbium-doped fiber amplifier is set to 0dB, the gain spectral of the superposition obtained is shown in Fig. 3, as can be seen from Figure 3, when increasing γ, total gain peak that superposition produces can reduce, and the reduction of peak value can reduce the Out-of-band rejection ratio of filter, thus reduces performance of filter.So need the power increasing pump light in the branch road of pump light with the first erbium-doped fiber amplifier and the second erbium-doped fiber amplifier, to ensure a stable gain peak, the multiplication factor setting the first erbium-doped fiber amplifier and the second erbium-doped fiber amplifier is 19 times and 24 times, when γ is 0,0.3,0.5,0.7 and 0.792, the gain spectral obtained is shown in Fig. 4.Fig. 5 is the corresponding filter passband schematic diagram produced by the gain spectral superposed, and when γ is 0,0.3,0.5,0.7 and 0.792, the three dB bandwidth of filter is respectively 10.96MHz, 8.42MHz, 6.78MHz, 5.06MHz and 4.14MHz.Along with the increase of γ, filter bandwidht can reduce gradually.
The three dB bandwidth of filter is 4.14MHz, f 0frequency change from 0.3GHz-29.7GHz, the output response spectrum of filter is shown in Fig. 6, and the frequency range of filter is 29.4GHz, thus the Q value that can calculate filter is 7101.

Claims (8)

1. the single tape of a ultra high quality factor leads to tunable microwave photon filter, it is characterized in that: by laser, first optical coupler, phase-modulator, optical isolator, vector network analyzer, highly nonlinear optical fiber, first pair of parallel intensity modulator, first intensity modulator, second optical coupler, first optical filter, second optical filter, second pair of parallel intensity modulator, second intensity modulator, 3rd intensity modulator, first erbium-doped fiber amplifier, second erbium-doped fiber amplifier, 3rd optical coupler, optical circulator and photodetector composition, laser output frequency is f csimple signal be divided into two through the first optical coupler, the light signal wherein going up branch road is sent in phase-modulator as light carrier, and the frequency that comprises exported by vector network analyzer frequency sweep is f ma series of small size microwave signals to be filtered with certain frequency bandwidth be loaded on light carrier by phase-modulator, a series of single order upper sideband that the phase place exported after phase-modulator is contrary, intensity is equal and lower sideband signal enter into highly nonlinear optical fiber through optical isolator, first the light signal of the lower branch road that the first optical coupler exports is f through first pair of parallel intensity modulator by frequency 0microwave signal modulation, adjustment first pair of parallel intensity modulator DC offset voltage, make its be operated in carrier wave suppress single-side belt state, make it only export single order upper sideband f c+ f 0signal, it is f that this upper side band signal continues to modulate by frequency through the first intensity modulator bsignal madulation, f balso be the excited Brillouin frequency shift amount of highly nonlinear optical fiber simultaneously, adjust the DC offset voltage of the first intensity modulator, make it be operated in the double-side band output state of carrier wave suppression, it exports the upper and lower sideband of single order and is respectively f c+ f 0+ f band f c+ f 0-f bsignal, then the upper and lower sideband signals of this single order is divided into two-way by the second optical coupler, and wherein upper side band signal filters through the first optical filter by the signal of a branch road, and remaining frequency is f c+ f 0-f blower sideband signal, frequency is f c+ f 0-f bsignal to be sent in second pair of parallel intensity modulator by frequency be 2f bsignal modulate further, the direct current (DC) bias of adjustment second pair of parallel intensity modulator, the single-side band modulation state making it be operated in carrier wave to suppress, thus output frequency is f c+ f 0-3f bsignal, then this signal to be fed in the second intensity modulator by frequency is 2f bsignal modulate further, obtaining frequency is f c+ f 0-f b, f c+ f 0-3f band f c+ f 0-5f bthree signals, then these three signals to be fed in the 3rd intensity modulator by frequency is f lsignal is modulated further, f lbe the frequency values set according to wanting the bandwidth of the filter realized, the operating state of the 3rd intensity modulator is set to the double-sideband modulation of carrier wave suppression, then obtaining frequency is f c+ f 0-f b+ f land f c+ f 0-f b-f l, f c+ f 0-3f b+ f land f c+ f 0-3f b-f land f c+ f 0-5f b+ f land f c+ f 0-5f b-f lsix signals, these six signals are fed to the first erbium-doped fiber amplifier further, two tributary signals that second optical coupler exports are carried out filtering by the second optical filter, and remaining frequency is f c+ f 0+ f bsignal, be fed in the second erbium-doped fiber amplifier, the luminous power of pump light is adjusted, with the reduction of the gain peak caused when compensating gain spectrum and loss spectra superposition by the first erbium-doped fiber amplifier and the second erbium-doped fiber amplifier, the frequency content that first erbium-doped fiber amplifier and the second erbium-doped fiber amplifier export is f c+ f 0+ f b, f c+ f 0-f b+ f land f c+ f 0-f b-f l, f c+ f 0-3f b+ f land f c+ f 0-3f b-f land f c+ f 0-5f b+ f land f c+ f 0-5f b-f lsignal, by 2 ports inputs of optical circulator after the 3rd optical coupler exports, export from 1 port of optical circulator and enter into high non-linearity light, produce the pump signal of stimulated Brillouin scattering effect as highly nonlinear optical fiber, the signal through phase-modulation that optical isolator exports and these pump signal interact in highly nonlinear optical fiber, after there is stimulated Brillouin scattering, by 1 port input of circulator, export from 3 ports of circulator, then send into vector network analyzer after carrying out opto-electronic conversion by photodetector, thus detection to obtain frequency be f mmicrowave signal, f c+ f 0+ f bthis pump signal is in frequency f c+ f 0place produces gain spectral, in frequency f c+ f 0+ 2f bplace produces loss spectra, pump signal f c+ f 0-f b-f lin frequency f c+ f 0-2f b-f lplace produces gain spectral, in frequency f c+ f 0-f lplace produces loss spectra, pump signal f c+ f 0-f b+ f lin frequency f c+ f 0-2f b+ f lplace produces gain spectral, in frequency f c+ f 0+ f lplace produces loss spectra, pump signal f c+ f 0-3f b-f lin frequency f c+ f 0-4f b-f lplace produces gain spectral, in frequency f c+ f 0-2f b-f lplace produces loss spectra, pump signal f c+ f 0-3f b+ f lin frequency f c+ f 0-4f b+ f lplace produces gain spectral, in frequency f c+ f 0-2f b+ f lplace produces loss spectra, pump signal f c+ f 0-5f b-f lin frequency f c+ f 0-6f b-f lplace produces gain spectral, in frequency f c+ f 0-4f b-f lplace produces loss spectra, pump signal f c+ f 0-5f b+ f lin frequency f c+ f 0-6f b+ f lplace produces gain spectral, in frequency f c+ f 0-4f b+ f lplace produces loss spectra, in the gain spectral and loss spectra of all generations, f c+ f 0-f b+ f land f c+ f 0-f b-f lthe gain spectral produced and f c+ f 0-3f b+ f land f c+ f 0-3f b-f lthe loss spectra produced offsets completely, f c+ f 0-3f b+ f land f c+ f 0-3f b-f lthe gain spectral produced and f c+ f 0-5f b+ f land f c+ f 0-5f b-f lthe loss spectra produced offsets completely, and pump signal f c+ f 0-f b+ f land f c+ f 0-f b-f lin frequency f c+ f 0+ f land f c+ f 0-f ltwo loss spectras that place produces and pump signal f c+ f 0+ f bin frequency f c+ f 0superimposed this gain spectral that makes of gain spectral that place produces narrows, owing to adopting multiple pump signal, and the gain spectral produced between them and loss spectra can suitably be offset, thus add the frequency tuning range of filter.
2. the single tape of a kind of ultra high quality factor as claimed in claim 1 leads to tunable microwave photon filter, it is characterized in that: select wavelength to be the laser of 1550nm.
3. the single tape of a kind of ultra high quality factor as claimed in claim 1 leads to tunable microwave photon filter, it is characterized in that: phase-modulator work optical wavelength is 1525nm ~ 1605nm, and bandwidth is 32GHz.
4. the single tape of a kind of ultra high quality factor as claimed in claim 1 leads to tunable microwave photon filter, it is characterized in that: the frequency range of network analyzer is 40M ~ 40GHz; Photodetector detective bandwidth is 35GHz; The excited Brillouin gain live width of highly nonlinear optical fiber is Γ b=40MHz.
5. the single tape of a kind of ultra high quality factor as claimed in claim 1 leads to tunable microwave photon filter, it is characterized in that: Brillouin shift amount f b=10GHz, length is 1000 meters, and gain and loss peak coefficient are 5.
6. the single tape of a kind of ultra high quality factor as claimed in claim 1 leads to tunable microwave photon filter, it is characterized in that: the isolation of optical isolator is greater than 40dB; First pair of parallel intensity modulator intensity modulator bandwidth parallel with second pair is 30GHz, is all operated in the single-side belt output state that carrier wave suppresses; The bandwidth of the first intensity modulator, the second intensity modulator and the 3rd intensity modulator is 32GHz.
7. the single tape of a kind of ultra high quality factor as claimed in claim 1 leads to tunable microwave photon filter, it is characterized in that: the wavelength tuning range of the first optical filter and the second optical filter is 1548nm ~ 1552nm, and live width is less than 10GHz; The wave-length coverage of the first erbium-doped fiber amplifier and the second erbium-doped fiber amplifier is 1530 ~ 1560nm, and multiplication factor is greater than 25 times.
8. the single tape of a kind of ultra high quality factor as claimed in claim 1 leads to tunable microwave photon filter, it is characterized in that: f lfor 20MHz.
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