CN103715480A - Single-band-pass tunable microwave photonic filter with ultrahigh quality factor - Google Patents

Single-band-pass tunable microwave photonic filter with ultrahigh quality factor Download PDF

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CN103715480A
CN103715480A CN201410025426.2A CN201410025426A CN103715480A CN 103715480 A CN103715480 A CN 103715480A CN 201410025426 A CN201410025426 A CN 201410025426A CN 103715480 A CN103715480 A CN 103715480A
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frequency
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filter
optical
intensity modulator
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CN103715480B (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

The invention discloses a single-band-pass tunable microwave photonic filter with an ultrahigh quality factor, belongs to the technical field of microwave photonics, and in particular relates to a single-band-pass tunable microwave photonic filter with the ultrahigh quality factor, and the single-band-pass tunable microwave photonic filter is implemented based on a high-nonlinearity optical fiber excited Brillouin scattering effect and a gain spectrum and loss spectrum superposition technology. The single-band-pass tunable microwave photonic filter consists of a laser, a first optical coupler, a phase modulator, an optical isolator, a vector network analyzer, a high-nonlinearity optical fiber, a first dual-parallel strength modulator, a first strength modulator, a second optical coupler, a first optical filter, a second optical filter, a second dual-parallel strength modulator, a second strength modulator, a third strength modulator, a first erbium-doped optical fiber amplifier, a second erbium-doped optical fiber amplifier, a third optical coupler, an optical circulator and a photoelectric detector. The 3dB broadband of the filter is reduced, and the frequency tuning range of the filter is expanded, so that the Q value of the filter is increased.

Description

A kind of logical tunable microwave photon filter of single band of ultra high quality factor
Technical field
The invention belongs to Microwave photonics technical field, be specifically related to a kind of logical tunable microwave photon filter of single band of the ultra high quality factor based on highly nonlinear optical fiber stimulated Brillouin scattering effect and gain spectral and the realization of loss spectra superimposing technique.
Background technology
Microwave photon filter is the Primary Component that light carries microwave/millimeter wave system, has low-loss, high operate frequency, anti-electromagnetic interference, has tunability and reconfigurability flexibly.Single-pass band, microwave photon filter tunable, high quality factor (Q value) are widely used at aspects such as military affairs, satellite remote sensing, broadband wireless communications and astrosurveillances.
The microwave photon filter that needs the high Q value of occasion needs of narrow-band filtering 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 that increases microwave photon filter is the target that scientific research personnel lays siege to always, generally by Cascading Methods, increase Q value, Enming Xu has realized the cascade of iir filter and iir filter, proposing therein to introduce in an iir filter wavelength changes and has successfully overcome the interference between light signal in two iir filters, obtained stable filter freguency response, solved the difficult problem that two iir filters can not cascade, by the different FSR of two iir filters are suitably set, due to vernier caliper effect, free spectral limit (FSR) after cascade increases significantly, thereby Q value is increased significantly, can reach 3338(Enming Xu, Xinliang Zhang, Lina Zhou, Yu Zhang, Yuan Yu, Xiang Li, and Dexiu Huang, Ultrahigh-Q microwave photonic filter with Vernier effect and wavelength conversion in a cascaded pair of active loops, Optics Letters, 2010, 35 (8): 1242-1244).Jie Liu has formed the microwave photon filter of high Q value with infinite impulse response (IIR) filter of two cascades, adopt electro-optical feedback loop, overcome optical coherence problem, quality factor have reached 4895.31 (Jie Liu, Nan Guo, Zhaohui Li, Changyuan Yu, and Chao Lv, An ultrahigh-Q microwave photonic filter with tunable Q value utilizing cascaded optical-electrical feedback loops, OPTICS LETTERS, 2013,38 (21): 4304-4307).Microwave photon filter based on stimulated Brillouin scattering effect has single-pass band, the outer rejection ratio of tunable and high-band, the three dB bandwidth of filter is relevant with the bandwidth of stimulated Brillouin scattering spectrum, Zhang Weiwei has built 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 approaches 1000(Weiwei Zhang and Robert A.Minasian, Widely Tunable Single-Passband Microwave Photonic Filter Based on Stimulated Brillouin Scattering, IEEE Photonics Technology Letters, 2011, 23 (23): 1775-1777).
Summary of the invention
The logical tunable microwave photon filter of single band that the object of this invention is to provide a kind of ultra high quality factor based on highly nonlinear optical fiber stimulated Brillouin scattering effect and gain spectral and the realization of loss spectra superimposing technique.
The structure of the microwave photon filter of high Q value of the present invention as shown in Figure 1, is comprised 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)) through the first optical coupler, be divided into two, the light signal of wherein going up branch road is sent in phase-modulator as light carrier, the frequency that comprises of being exported by vector network analyzer frequency sweep is f ma series of small size microwave signals to be filtered with certain frequency bandwidth by phase-modulator, be loaded on light carrier, (Fig. 2 (2) represents that its medium frequency is f for a series of single order upper sidebands that the single spin-echo of exporting after phase-modulator, intensity equate and lower sideband signal msignal modulation after frequency spectrum) through optical isolator, enter into highly nonlinear optical fiber; First the light signal (Fig. 2 (3)) of the lower branch road of the first optical coupler output is f through first pair of parallel intensity modulator by frequency 0microwave signal modulation, adjust the DC offset voltage of first pair of parallel intensity modulator, make it be operated in the single-side belt state that carrier wave suppresses, make it only export single order upper sideband f c+ f 0signal (Fig. 2 (4)), it is f by frequency that this upper side band signal continues through the first intensity modulator modulation bsignal modulation (f balso be the excited Brillouin frequency shift amount of highly nonlinear optical fiber simultaneously), the DC offset voltage of adjustment the first intensity modulator, makes it be operated in the double-side band output state that carrier wave suppresses, and the upper and lower sideband of its output single order 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 the signal of a branch road filters upper side band signal through the first optical filter, 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 be 2f by frequency bsignal further modulate, adjust the direct current (DC) bias of second pair of parallel intensity modulator, make it be operated in the single-side band modulation state that carrier wave suppresses, output is only single order lower sideband, thus output frequency is f c+ f 0-3f bsignal (Fig. 2 (7)), to be then fed in the second intensity modulator be 2f by frequency to this signal bsignal further modulate, 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)), to be then fed in the 3rd intensity modulator be f by frequency to this signal l(f lthe frequency values of setting according to the bandwidth of the filter of wanting to realize) signal further modulates, and the operating state of the 3rd intensity modulator is set to the double-sideband modulation that carrier wave suppresses, and 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)), these six signals are fed to the first erbium-doped fiber amplifier using the part as pump signal; Two tributary signals of the second optical coupler output 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; The first erbium-doped fiber amplifier and the second erbium-doped fiber amplifier are in order to adjust the luminous power of pump light, the reduction of the gain peak causing during with compensating gain spectrum and loss spectra stack.The 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, after the 3rd optical coupler output, by 2 ports of optical circulator, input, from 1 port output of optical circulator, enter into high non-linearity light, as highly nonlinear optical fiber, produce the pump signal of stimulated Brillouin scattering effect.The signal through phase-modulation and these pump signal of optical isolator output interact in highly nonlinear optical fiber, occur after stimulated Brillouin scattering, 1 port by circulator is inputted, the 3 port outputs from circulator, then by photodetector, being undertaken sending into vector network analyzer after opto-electronic conversion, is f thereby detection obtains frequency mmicrowave signal.
The high Q value of filter is to realize by reducing the three dB bandwidth of output spectrum, the processing that filter bandwidht narrows is to make to stack up with the gain spectral producing by increasing pump light introducing loss spectra, by stack, just makes gain spectral narrow down on original basis.Specific implementation process is as follows: the frequency of laser output signal is f c, establish that in signal to be filtered, to have frequency be f mthe signal of (being exported by network analyzer) obtains the upper and lower rank of the single order upper side band signal f of equal and opposite in direction, single spin-echo 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, f wherein 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 and the f that produce c+ f 0-3f b+ f land f c+ f 0-3f b-f lthe loss spectra producing offsets completely, f c+ f 0-3f b+ f land f c+ f 0-3f b-f lthe gain spectral and the f that produce c+ f 0-5f b+ f land f c+ f 0-5f b-f lthe loss spectra producing 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 down, and treated stimulated Brillouin scattering spectrum is afterwards as Fig. 2 (12).Owing to adopting a plurality of pump signal, and the gain spectral producing between them and loss spectra can suitably offset, and therefore increased the frequency tuning range of filter.Work as f m=f 0time, f mthe single order upper side band signal f that signal is exported 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), so 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 survey and obtain frequency is f mmicrowave signal.
By setpoint frequency f lnumerical value, the multiplication factor of the first and second erbium-doped fiber amplifiers, can adjust the width of the gain spectral after stack, make it to reach the numerical value needing.Because this filter passband is that the gain spectral producing by mapping stimulated Brillouin scattering effect obtains, so process and just can make the bandwidth of filter narrow down by gain spectral is narrowed down.
By adjusting the frequency f of the input microwave signal of the first double-parallel modulator 0, the centre frequency of filter output signal will change, within the specific limits can be tuning thereby realize the frequency of microwave photon filter output.The Q value of filter equals the ratio of frequency tuning range and the three dB bandwidth of filter, and the present invention has reduced the three dB bandwidth of filter, and has increased the frequency tuning range of filter, thereby has increased the Q value of filter.
It is the laser of 1550nm that the present invention selects wavelength, 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, 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, establish 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 lpeak value and the pump signal f of the loss spectra that place produces 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, thereby reduces performance of filter.So need to increase the power of pump light with the first erbium-doped fiber amplifier and the second erbium-doped fiber amplifier in the branch road of pump signal, to guarantee a stable gain peak, need again to increase γ and obtain narrower gain spectral simultaneously.
Accompanying drawing explanation
Fig. 1: high Q value microwave photon filter construction schematic diagram;
Fig. 2: the gain spectral processing procedure schematic diagram that narrows down;
Fig. 3: gain and the loss peak gain spectral afterwards that superposes when different during without light amplification;
Fig. 4: gain with loss peak than the constant gain spectral of peak value after different and stack;
Fig. 5: gain and loss peak are than different and filter passband schematic diagram while superposeing that peak value is constant afterwards;
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 that 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, gain and loss peak coefficient are 5; The isolation of optical isolator is greater than 40dB; The first pair of parallel intensity modulator and second pair of parallel intensity modulator are 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 that carrier wave suppresses, only export single order upper sideband, second pair of parallel intensity modulator is operated in the single-side belt output state that carrier wave suppresses, and only exports single order lower sideband; The 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; The first optical filter and the second optical filter are the adjustable light wave-filter of Santec company, and model is OTF-950, wavelength tuning range be 1548nm to 1552nm, 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.
By Fig. 1, connect corresponding instrument and equipment, the wavelength set of laser is 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 of phase-modulator output enters into highly nonlinear optical fiber after by isolator.At another branch road, first the light signal of the 1550nm of laser output 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 that carrier wave suppresses, 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, by frequency, be excited Brillouin frequency shift amount f bmicrowave signal modulation, the direct current (DC) bias of setting the first intensity modulator is 9V, makes its double-side band output state suppressing in carrier wave, 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 the signal of one of them branch road filters upper side band signal through the first optical filter, 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, 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 of adjusting the second intensity modulator is 4.5V, obtaining frequency is f c+ f 0-f b, f c+ f 0-3f band f c+ f 0-5f b, they are admitted in the 3rd intensity modulator is f by frequency lthe signal of=20MHz is further modulated, and the DC offset voltage of adjusting the 3rd intensity modulator is 9V, makes it be operated in the double-side band output state that carrier wave suppresses, and 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.The signal of another output branch road of the 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 the gain peak causing while superposeing with compensating gain spectrum and loss spectra.After the first Erbium-Doped Fiber Amplifier and the amplification of the second erbium-doped fiber amplifier, 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, after the 3rd optical coupler output, by 2 ports of optical circulator, input, from 1 port output of optical circulator, enter into high non-linearity light, as the pump signal of the stimulated Brillouin scattering effect of highly nonlinear optical fiber.Phase-modulator is exported the upper and lower sideband signals of single order of a series of equal and opposite in directions, single spin-echo, 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 stack producing c+ f 0unanimously, thus frequency be f c+ f m(f m=f 0) upper side band signal will be enhanced, thereby 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 lpeak value and the pump signal f of the loss spectra that place produces 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 stack obtaining is shown in Fig. 3, as can be seen from Figure 3, when increasing γ, total gain peak that stack produces can reduce, and the reduction of peak value can reduce the Out-of-band rejection ratio of filter, thereby reduces performance of filter.So need to increase the power of pump light with the first erbium-doped fiber amplifier and the second erbium-doped fiber amplifier in the branch road of pump light, to guarantee a stable gain peak, the multiplication factor of setting the first erbium-doped fiber amplifier and the second erbium-doped fiber amplifier is 19 times and 24 times, γ is 0,0.3,0.5,0.7 and 0.792 o'clock, and the gain spectral obtaining is shown in Fig. 4.Fig. 5 corresponding filter passband schematic diagram that the gain spectral of stack produces of serving as reasons, γ is 0,0.3,0.5,0.7 and 0.792 o'clock, 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 from 0.3GHz-29.7GHz, change, the output response spectrum of filter is shown in Fig. 6, the frequency range of filter is 29.4GHz, thereby the Q value that can calculate filter is 7101.

Claims (9)

1. single band of a ultra high quality factor leads to tunable microwave photon filter, it is characterized in that: by 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 form, laser output frequency is f csimple signal through the first optical coupler, be divided into two, the light signal of wherein going up branch road is sent in phase-modulator as light carrier, the frequency that comprises of being exported by vector network analyzer frequency sweep is f ma series of small size microwave signals to be filtered with certain frequency bandwidth by phase-modulator, be loaded on light carrier, a series of single order upper sidebands and lower sideband signal that the single spin-echo of exporting after phase-modulator, intensity equate enter into highly nonlinear optical fiber through optical isolator, first the light signal of the lower branch road of the first optical coupler output is f through first pair of parallel intensity modulator by frequency 0microwave signal modulation, adjust the DC offset voltage of first pair of parallel intensity modulator, make it be operated in the single-side belt state that carrier wave suppresses, make it only export single order upper sideband f c+ f 0signal, it is f by frequency that this upper side band signal continues through the first intensity modulator modulation bsignal modulation, 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 that carrier wave suppresses, the upper and lower sideband of its output single order 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, wherein the signal of a branch road filters upper side band signal through the first optical filter, 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 be 2f by frequency bsignal further modulate, adjust the direct current (DC) bias of second pair of parallel intensity modulator, make it be operated in the single-side band modulation state that carrier wave suppresses, thereby output frequency is f c+ f 0-3f bsignal, to be then fed in the second intensity modulator be 2f by frequency to this signal bsignal further modulate, obtaining frequency is f c+ f 0-f b, f c+ f 0-3f band f c+ f 0-5f bthree signals, to be then fed in the 3rd intensity modulator be f by frequency to this signal lsignal is further modulated, f lbe the frequency values of setting according to the bandwidth of the filter of wanting to realize, the operating state of the 3rd intensity modulator is set to the double-sideband modulation that carrier wave suppresses, and 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 further fed to the first erbium-doped fiber amplifier, two tributary signals of the second optical coupler output 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, by the first erbium-doped fiber amplifier and the second erbium-doped fiber amplifier, adjust the luminous power of pump light, the reduction of the gain peak causing during with compensating gain spectrum and loss spectra stack, the frequency content of the first erbium-doped fiber amplifier and the output of the second erbium-doped fiber amplifier 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, after the 3rd optical coupler output, by 2 ports of optical circulator, input, from 1 port output of optical circulator, enter into high non-linearity light, as highly nonlinear optical fiber, produce the pump signal of stimulated Brillouin scattering effect, the signal through phase-modulation and these pump signal of optical isolator output interact in highly nonlinear optical fiber, occur after stimulated Brillouin scattering, 1 port by circulator is inputted, the 3 port outputs from circulator, then by photodetector, being undertaken sending into vector network analyzer after opto-electronic conversion, is f thereby detection obtains frequency mmicrowave signal.
2. the logical tunable microwave photon filter of single band of a kind of ultra high quality factor as claimed in claim 1, is characterized in that: 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 and the f that produce c+ f 0-3f b+ f land f c+ f 0-3f b-f lthe loss spectra producing offsets completely, f c+ f 0-3f b+ f land f c+ f 0-3f b-f lthe gain spectral and the f that produce c+ f 0-5f b+ f land f c+ f 0-5f b-f lthe loss spectra producing 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 down; Owing to adopting a plurality of pump signal, and the gain spectral producing between them and loss spectra can suitably offset, thereby increased the frequency tuning range of filter.
3. the logical tunable microwave photon filter of single band of a kind of ultra high quality factor as claimed in claim 1, is characterized in that: selecting wavelength is the laser of 1550nm.
4. the logical tunable microwave photon filter of single band of a kind of ultra high quality factor as claimed in claim 1, is characterized in that: phase-modulator work optical wavelength is 1525nm～1605nm, and bandwidth is 32GHz.
5. the logical tunable microwave photon filter of single band of a kind of ultra high quality factor as claimed in claim 1, 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.
6. the logical tunable microwave photon filter of single band of a kind of ultra high quality factor as claimed in claim 1, is characterized in that: Brillouin shift amount f b=10GHz, length is 1000 meters, gain and loss peak coefficient are 5.
7. the logical tunable microwave photon filter of single band of a kind of ultra high quality factor as claimed in claim 1, 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.
8. the logical tunable microwave photon filter of single band of a kind of ultra high quality factor as claimed in claim 1, 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.
9. the logical tunable microwave photon filter of single band of a kind of ultra high quality factor as claimed in claim 1, is characterized in that: f lfor 20MHz.
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