CN103326789B - A kind of microwave Phase Shifting System of frequency-tunable and method - Google Patents
A kind of microwave Phase Shifting System of frequency-tunable and method Download PDFInfo
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- CN103326789B CN103326789B CN201310160907.XA CN201310160907A CN103326789B CN 103326789 B CN103326789 B CN 103326789B CN 201310160907 A CN201310160907 A CN 201310160907A CN 103326789 B CN103326789 B CN 103326789B
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Abstract
The invention belongs to Microwave photonics field, disclose a kind of microwave Phase Shifting System and method of frequency-tunable, comprise continuous light carrier wave a branch of double-side band light signal producing carrier wave suppression through MZ Mach-Zehnder after beam splitting, another bundle produces the optical carrier after phase shift through phase-modulator, by tunable one of them single order sideband of micro-ring wave filter filtering after two-beam signal ECDC ripple, obtain the carrier signal after a frequency translation and a dephased carrier signal, then carry out the opto-electronic conversion generation phase-shift microwave signal of telecommunication through photodetector; By the frequency of change input voltage drive singal and the resonance wavelength of tunable micro-ring wave filter, make the resonance frequency of tunable micro-ring wave filter equal any one single order sideband in two single order sidebands of MZ Mach-Zehnder output, change the frequency of phase-shift microwave signal.Output performance of the present invention is stable, phase shift governing response is fast, export little, the frequency continuously adjustabe on a large scale of microwave amplitude fluctuation.
Description
Technical field
The invention belongs to Microwave photonics field, more specifically, relate to a kind of frequency-tunable microwave Phase Shifting System based on double-parallel modulator and tunable micro-ring wave filter structure and method.
Background technology
Microwave Phase Shifting System is as the Primary Component in microwave signal phase process, be mainly used in Microwave photonics signal transacting and Optically controlled microwave row radar system, in various fields such as satellite communication, mobile communication, military affairs, space flight and aviation, all there is important application.Traditional microwave Phase Shifting System mainly electronics phase-shifter, is subject to the restriction of electronic bottleneck, and the microwave signal band bandwidth of generation is little, antijamming capability is weak, and phase shift range is little, can not meet the active demand of advanced capabilities radar.
In recent years, microwave photon Phase Shifting System realize principle and technology mainly contains three kinds: optics true time delay (OpticalTrueTimeDelay, OTTD) technology, heterodyne mixing technique and vector sum technique.Microwave photon Phase Shifting System research wherein based on the true delay technique of optics occurs the earliest, but its structure is generally made up of a lot of delay unit, the interchannel of different delay produces phase difference, after photodetector beat frequency, form phase-shift microwave signal, but the adjustment of system phase is comparatively complicated.Based in the microwave photon Phase Shifting System of optical heterodyne mixing, owing to very easily introducing the random phase noise caused by environmental factor in two-way optical interference circuit, cause the unsteadiness that microwave photon phase shift exports.Microwave photon phase-shifter based on vector realizes the microwave signal phase shift after Vector modulation mainly through the amplitude changing the same microwave signal frequently of two-way, but there is the shortcomings such as controllable phase shift scope is little, the shake of output microwave amplitude is large.
Obviously, tradition existing above produces method all Shortcomings of microwave phase shift, and in the increasing Microwave photonics system of application, how to produce amplitude fluctuation little in large frequency range, the microwave telecommunication number of the high-quality stable output that Phase Continuation is adjustable will be a major challenge.
Summary of the invention
For the defect of prior art, the invention provides a kind of microwave Phase Shifting System of the frequency-tunable based on double-parallel modulator and micro-ring wave filter structure, this system can produce the microwave telecommunication number that amplitude fluctuation is little, Phase Continuation is adjustable in large frequency range.
The microwave Phase Shifting System of frequency-tunable provided by the invention comprises: laser, for the continuous light carrier signal that output frequency is single; Beam splitter, its input is connected with the output of described laser, for described continuous light carrier signal is divided into two-beam signal; Intensity modulator, its first input end is connected to the first output of described beam splitter, second input of described intensity modulator is for receiving input voltage drive singal, 3rd input of described intensity modulator is for receiving bias voltage, for described intensity modulator being set to according to described bias voltage the operating state of carrier wave suppression, and according to described input voltage drive singal, light beam signal is modulated to the double-side band light signal of rear outgoing carrier suppression; Phase-modulator, its first input end is connected to the second output of described beam splitter, second input of described phase-modulator, for receiving driving voltage, carries out phase-modulation for restrainting light signal according to described driving voltage to another and exports the light carrier after phase shift; Bundling device, its first input end is connected to the output of described intensity modulator, second input of described bundling device is connected to the output of described phase-modulator, for the light carrier after described double-side band light signal and described phase shift being carried out conjunction ripple and exporting a branch of hybrid frequency light; Tunable micro-ring wave filter, its input is connected to the output of described bundling device, for carrying out filtering to described hybrid frequency light, exports the carrier signal after a frequency translation and a dephased carrier signal; And photodetector, be connected to the output of described tunable micro-ring wave filter, for the carrier signal after described frequency translation and dephased carrier signal are carried out opto-electronic conversion and output phase shift microwave signal.
Further, also comprise: radio frequency source, be connected to the second input of described intensity modulator, for providing described input voltage drive singal; First DC source, is connected to the 3rd input of described intensity modulator, for providing described bias voltage; And second DC source, be connected to the second input of described phase-modulator, for providing described driving voltage.
Further, described intensity modulator is MZ Mach-Zehnder.
Further, the frequency of described input voltage drive singal equals the frequency of the phase-shift microwave signal that photodetector exports, and the amplitude of described input voltage drive singal equals the amplitude of the half-wave voltage of described MZ Mach-Zehnder; Described bias voltage is the half-wave voltage of described MZ Mach-Zehnder.
Further, described beam splitter, MZ Mach-Zehnder, phase-modulator and bundling device are that semi-conducting material is integrated in one.
By the above technical scheme that the present invention conceives, compared with prior art, because its optical interference circuit completes in integrated double-parallel modulator inside, the environmental phase noise that thus may be subject to is little, whole microwave Phase Shifting System can also be integrated on a slice semi-conducting material simultaneously, reduces system bulk, strengthens stability.Have employed the frequency-adjustable that tunable micro-ring wave filter realizes exporting microwave, can obtain and produce the beneficial effects such as amplitude fluctuation is little, Phase Continuation is adjustable, the microwave signal of fast response time in large frequency range.
Present invention also offers a kind of phase shifting method of microwave Phase Shifting System, comprise the steps:
S1: the half-wave voltage being equaled MZ Mach-Zehnder by the output voltage setting the first DC source, makes MZ Mach-Zehnder be operated in the operating state of carrier wave suppression;
S2: the laser that laser sends is a branch of after beam splitter beam splitting to be entered in MZ Mach-Zehnder, and another bundle enters phase-modulator;
S3: MZ Mach-Zehnder carries out dual-band frequency according to input voltage drive singal to light beam signal and moves; Phase-modulator carries out phase shift according to driving voltage to another bundle light signal;
S4: bundling device dual-band frequency is moved after light signal and dephased light signal carry out conjunction ripple after export hybrid frequency light;
S5: tunable micro-ring wave filter carries out filtering to described hybrid frequency light and the carrier signal exported after a frequency translation and a dephased carrier signal;
S6: photodetector carries out opto-electronic conversion to the carrier signal after frequency translation and dephased carrier signal and obtains phase-shift microwave signal.
Further, also comprise the steps: that the size by changing the driving voltage that the second DC source exports makes the phase place of phase-shift microwave signal change.
Further, also comprise the steps: the frequency by changing described input voltage drive singal and the resonance wavelength changing tunable micro-ring wave filter, make the resonance frequency of tunable micro-ring wave filter equal any one single order sideband in two single order sidebands of MZ Mach-Zehnder output, change the frequency of phase-shift microwave signal.
Further, the frequency of described input voltage drive singal equals the frequency of phase-shift microwave signal.
Further, the resonance wavelength of micro-ring wave filter is changed by thermo-optical electrode.
Because the present invention adopts a Mach-Zehnder modulators to produce the double-side band light signal of carrier wave suppression, and the method utilizing tunable micro-ring wave filter to carry out linear filter produces the light carrier of a frequency translation, with carry out the light carrier after phase shift through phase-modulator and carry out beat frequency and produce the stability microwave signal of telecommunication that amplitude fluctuation is little, Phase Continuation is adjustable high-quality exports, and the frequency of the microwave telecommunication exported number is also continuously adjustable.
Accompanying drawing explanation
Fig. 1 is the theory diagram of microwave Phase Shifting System provided by the invention;
Fig. 2 is the transmission curve of MZ Mach-Zehnder in microwave Phase Shifting System provided by the invention, and wherein, A represents the signal of telecommunication of input, and B represents the light signal of output;
Fig. 3 (a) is tunable micro-ring resonant cavity structural representation in microwave Phase Shifting System provided by the invention;
Fig. 3 (b) is tunable micro-ring resonant cavity frequency response curve in microwave Phase Shifting System provided by the invention;
Fig. 4 is that the microwave Phase Shifting System that the embodiment of the present invention provides exports the phase shift size of microwave signal with direct voltage relation curve added by phase-modulator;
Fig. 5 is that the microwave Phase Shifting System that the embodiment of the present invention provides exports the amplitude of microwave signal with phase shift variations relation curve.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The present invention relates to Microwave photonics field opto-electronic device technology of preparing, provide a kind of microwave photon Phase Shifting System of the frequency-tunable based on integrated double-parallel modulator (parallel MZ Mach-Zehnder (MZM) and phase-modulator (PM)) and the micro-ring structure of resonance tunable wave length; Mainly for generation of the high-frequency microwave signal of telecommunication of frequency, phase-adjustable; There is the advantages such as transmission performance is stable, the fluctuation of output phase shift microwave amplitude is little, microwave frequency continuously adjustabe.Meanwhile, the present invention also have phase shift governing response fast, export microwave frequency and the feature such as phase adjustment range is large.
The microwave Phase Shifting System of frequency-tunable provided by the invention comprises: laser 1, beam splitter 2, MZ Mach-Zehnder 3, phase-modulator 4, bundling device 5, tunable micro-ring wave filter 6, photodetector 7, radio frequency source 8, first DC source 9 and the second DC source 10, the continuous light carrier signal that laser 1 output frequency is single, continuous light carrier signal is divided into two-beam signal by beam splitter 2, MZ Mach-Zehnder 3 carries out modulating and the double-side band light signal of outgoing carrier suppression to the light beam signal that beam splitter 2 exports according to the bias voltage control signal of outside, phase-modulator 4 is modulated according to the voltage control signal of outside another bundle light signal that beam splitter 2 exports and exports the optical carrier after phase shift, the output of the output of MZ Mach-Zehnder 3 and phase-modulator 4 is synthesized a branch of hybrid frequency light by bundling device 5, its radio-frequency component comprises the light carrier after two 1 rank sidebands and phase shift, tunable micro-ring wave filter 6 exports the carrier signal after a frequency translation and a dephased carrier signal after carrying out filtering to described hybrid frequency light signal, the output of photodetector 7 to tunable micro-ring wave filter 6 is carried out opto-electronic conversion and is obtained dephased microwave signal.
Wherein, frequency translation (Frequencyshift) refers to the frequency of the signal of telecommunication or light signal from a frequency translation to another frequency.
The continuous light carrier signal of laser 1 for providing frequency single, laser 1 can select the continuous light laser of narrow linewidth.
The input of beam splitter 2 is connected to the output of laser 1, is divided into identical two-beam for the continuous light carrier wave exported by laser 1.
Fig. 2 shows the transmission curve of MZ Mach-Zehnder in microwave Phase Shifting System provided by the invention, wherein half-wave voltage refers to that the Output optical power of modulator changes to the bias voltage corresponding to minimum value from maximum, the Output optical power maximum of modulator and the bias voltage corresponding to minimum value are called maximum functional point and minimum working point, and in figure, Max, Null, Vp distinguish correspondence maximum functional point, minimum working point, half-wave voltage.
The first input end of MZ Mach-Zehnder 3 is connected to the first output of beam splitter 2, second input of MZ Mach-Zehnder 3 connects radio frequency source 8, 3rd input of MZ Mach-Zehnder 3 connects the first DC source 9, a branch of continuous light signal that the first output that MZ Mach-Zehnder 3 receives beam splitter 2 exports, the first DC source 9 is utilized to load suitable DC offset voltage (equaling the half-wave voltage of modulator) to MZ Mach-Zehnder 3, the working point of MZ Mach-Zehnder 3 is set in the minimum working point (Null) of transmission curve (as shown in Figure 2), the minimum working point (Null) of MZ Mach-Zehnder 3 transmission curve refers to the bias voltage of the minimum correspondence of Output optical power, by radio frequency source 8 for it provides the signal of telecommunication of characteristic frequency (characteristic frequency equals the frequency of microwave signal that photodetector 7 exports), final MZ Mach-Zehnder 3 exports the double-side band light signal for carrier wave suppresses, move respectively to both sides by original optical signal frequency, the amount of moving is the characteristic frequency of output signal in radio frequency source 8.
The first input end of phase-modulator 4 is connected to the second output of beam splitter 2, second input of phase-modulator 4 connects the second DC source 10, another bundle continuous light signal that the second output that phase-modulator 4 receives beam splitter 2 exports, the second DC source 10 is utilized to provide a certain suitable voltage to phase-modulator 4, make it export light and produce a fixing phase difference relative to input light, namely obtain the light carrier after phase shift.Described a certain suitable voltage V
dCwith the phase shift exported desired by system
relevant, the relation of both correspondences by
determine, V
π PMfor the half-wave voltage of phase-modulator 4, k represents the rejection coefficient of tunable micro-ring wave filter 6.
The first input end of bundling device 5 connects the output of MZ Mach-Zehnder 3, second input of bundling device 5 connects the output of phase-modulator 4, the light signal exported for the light signal that exported by MZ Mach-Zehnder 3 and phase-modulator 4 closes waveform bunchy hybrid frequency light, and its radio-frequency component comprises the light carrier after two 1 rank sidebands and phase shift.
The input of tunable micro-ring wave filter 6 is connected to the output of bundling device 5, hybrid frequency light for exporting bundling device 5 carries out filtering, remove wherein any one single order sideband, export the carrier signal after a frequency translation and a dephased carrier signal.
As shown in Fig. 3 (a), the concrete structure of tunable micro-ring wave filter 6 is one to form with the semiconductor microactuator annular resonant cavity of thermo-optical electrode, makes material producing heat-dissipating luminous effect change the resonance wavelength of micro-ring wave filter by electrode power supply.
The transmission curve of the transmission spectrum of tunable micro-ring wave filter 6 is as shown in Fig. 3 (b), the hybrid frequency light being input as bundling device 5 output of tunable micro-ring wave filter 6, carry out filtering process, by one of them single order sideband (that frequency component after moving to left or moving to right) filtering, and export the light of two remaining frequencies, comprise a carrier wave after frequency translation and one through dephased carrier wave.Wherein, tunable micro-ring wave filter 6 utilizes thermo-optical electrode pair microwave to heat, realize the tunable of filter resonance frequency (wavelength), thus can guarantee system works when different frequency also can filtering bundling device 5 export hybrid frequency light signal in a single order sideband.
The input of photodetector 7 is connected to the output of tunable micro-ring wave filter 6, for opto-electronic conversion is carried out in the output of tunable micro-ring wave filter 6, namely the light signal of two different frequencies carries out beat frequency and obtains the corresponding signal of telecommunication, is the signal of telecommunication after phase shift.
In the embodiment of the present invention, when using double-parallel modulator, by the function regulating the bias voltage NULL point be arranged on MZM transmission curve on MZM to realize Double Sideband Suppressed Carrier modulation, phase-modulator loads a direct voltage, for changing the phase place of light beam after phase-modulator.After interfering synthesis, obtain the micro-ring wave filter filtering 1 rank sideband wherein of phase modulated signal through cascade, obtain single-side belt output light field.The single-side belt light field exported obtains the microwave current signal after phase shift after photoelectric detector PD beat frequency.
Wherein, double-parallel modulator can be the integrated device of based semiconductor material, and simultaneously micro-ring wave filter also can be the integrated multiple micro-ring of semi-conducting material, thus can realize integrated microwave phase shifter, increase stability.
Radio frequency source 8 provides input electrical signal for giving MZ Mach-Zehnder 3, and its output frequency and amplitude set as required.The frequency of radio frequency source 8 output voltage equals the frequency of the microwave signal that photodetector 7 exports, and the amplitude of radio frequency source 8 output voltage equals the half-wave voltage of MZ Mach-Zehnder 3.
First DC source 9 provides bias voltage for giving MZ Mach-Zehnder 3.The output of the first DC source 9 can be set as the half-wave voltage of MZ Mach-Zehnder 3.
Second DC source 10 provides input voltage for giving phase-modulator 4, makes phase-modulator 4 can realize required phase shift.
In embodiments of the present invention, beam splitter 2, MZ Mach-Zehnder 3, phase-modulator 4 and bundling device 5 can utilize semi-conducting material to be integrated in one, such one side can reduce light signal in beam splitting with close the asymmetry and loss that produce in bundle process, can also reduce the noise owing to producing in discrete device on the other hand, integrated double-parallel modulator has more stable optical property.
In embodiments of the present invention, laser 1, beam splitter 2, MZ Mach-Zehnder 3, phase-modulator 4, bundling device 5 and tunable micro-ring wave filter 6 all can be integrated on same semi-conducting material, can reduce the volume of present system, reduce complexity, increase stability and reliability.
The present invention is compared with traditional microwave photon phase-shifting technique, the present invention due to its optical interference circuit be complete in integrated double-parallel modulator inside, thus the environmental phase noise be subject to is little, whole Phase Shifting System volume I is on the semiconductor integrated simultaneously, can not only stable transfer, also have that the shake of microwave signal output amplitude is little, the speed of response fast, bandwidth range tunable, export the advantages such as microwave 360 ° of continuously adjustabe.
For setting forth the present invention further for the technological means reaching predetermined goal of the invention and take and effect, below in conjunction with accompanying drawing, embodiment and the operation principle of the substantially integrated double-parallel modulator propose foundation the present invention and the microwave Phase Shifting System of resonance tunable wave length are described in detail.
If input optical carrier is E
0=A
0cos (ω
0t), wherein A
0, ω
0for amplitude and the frequency of light carrier.In MZ Mach-Zehnder 3, input voltage drive singal RF1 is V
1cos (ω
1t), wherein, V
1, ω
0amplitude and the frequency of driving voltage respectively.The Null point (see accompanying drawing 2) on transmission curve is arranged on, i.e. V by the bias voltage DC1 on adjustment MZ Mach-Zehnder 3
bias=V
π 1, realize the function of Double Sideband Suppressed Carrier modulation.Wherein voltage drive signals RF1 is provided by radio frequency source 8, and bias voltage DC1 is provided by the first DC source 9.
Output signal E after MZ Mach-Zehnder 3 is modulated
1expression formula be:
The phase-modulator on another road loads direct voltage V
dC, for changing the phase place of light beam output optical signal after phase-modulator, like this, the light field expression formula after phase-modulator is:
After double-parallel modulator, the light wave electric field of optics coherence tomography is like this:
Above-mentioned signal is through one of them single order sideband of micro-ring wave filter (or micro-ring of multiple cascade) filtering, and wherein the frequency response curve of micro-ring wave filter is as shown in Figure 3, then final single-side belt output light field is:
Wherein k is right+1 rank sideband light field amplitude rejection coefficient of micro-ring wave filter, the light intensity attenuation coefficient defining its logarithmic form is the microwave current signal that α=-20lgk obtains after photoelectric detector PD beat frequency, due to the restriction of photoelectric detector PD bandwidth, the higher order term of the photoelectric current produced after can ignoring beat frequency, approximate expression is:
Wherein R is the responsiveness of PD.Then the photoelectric current exported can be write as following form according to vector sum technique:
wherein the amplitude of microwave and phase place are respectively:
Above formula shows, by regulating different φ
pMjust can to the microwave continuous phase shift exported.If the suppression of right+1 rank sideband of filter is enough strong, namely k is enough little, as α>=25dB, and the microwave phase shift after the phase shift that system exports
retention wire sexual intercourse basic with the change of phase-modulator phase place, namely
and export the change of microwave amplitude to phase shift insensitive, namely this system exports the amplitude fluctuation little (being no more than 0.5dB) of microwave.Accompanying drawing 4 and accompanying drawing 5 sets forth, when the attenuation coefficient that right+1 rank sideband of filter is maximum is 25dB, export microwave signal phase shift size with the direct voltage magnitude relationship curve that phase-modulator 4 loads and export microwave signal amplitude with phase shift variations curve.
Because the frequency finally exporting microwave telecommunication number is determined by the drive singal of MZ Mach-Zehnder 3 (output of radio frequency source 8) frequency, as long as the micro-ring wave filter therefore in the present invention makes the tunable filter of resonance wavelength (as Thermo-optic tunability or electro-optic tunable), make its keep filtering always 3+1 rank produced (or-1 rank) sidebands can realize output frequency adjustable, microwave photon phase-shifter that amplitude fluctuation is little.
In the embodiment of the present invention, double-parallel modulator in microwave photon Phase Shifting System can be the integrated device of based semiconductor material, simultaneously because micro-ring wave filter also can be integrated on semi-conducting material easily, thus proposedly realize microwave photon Phase Shifting System and can make integrated device, reduce size, strengthen stability.
Present invention also offers a kind of phase shifting method of microwave Phase Shifting System, comprise the steps:
S1: the bias voltage exported by setting the first DC source 9 equals the half-wave voltage of MZ Mach-Zehnder 3, makes MZ Mach-Zehnder 3 be operated in the operating state of carrier wave suppression;
S2: the laser that laser 1 sends is a branch of after beam splitter 2 beam splitting to be entered in MZ Mach-Zehnder 3, and another bundle enters phase-modulator 4;
S3: MZ Mach-Zehnder 3 carries out dual-band frequency according to the signal of telecommunication that radio frequency source 8 produces to light beam signal and moves;
The driving voltage that phase-modulator 4 exports according to the second DC source 10 carries out phase shift to another bundle light signal;
S4: bundling device 5 dual-band frequency is moved after light signal and dephased light signal carry out conjunction ripple after export hybrid frequency light, its radio-frequency component comprises the light carrier after two 1 rank sidebands and phase shift;
S5: tunable micro-ring wave filter 6 pairs of hybrid frequency light carry out filtering and carrier signal after exporting a frequency translation and a dephased carrier signal;
S6: the carrier signal after photodetector 7 pairs of frequency translations and dephased carrier signal are carried out opto-electronic conversion and obtained phase-shift microwave signal.
This phase shifting method also comprises the steps: that the driving voltage exported by changing the second DC source 10 makes the phase place of phase-shift microwave signal change; Driving voltage and phase place are periodic linear relationship, and namely in one-period, phase place linearly increases along with the increase of driving voltage.
This phase shifting method also comprises the steps: the frequency of the output voltage by changing radio frequency source 8 and changes the resonance wavelength of tunable micro-ring wave filter 6, make the resonance frequency of tunable micro-ring wave filter 6 equal any one single order sideband in two single order sidebands of MZ Mach-Zehnder 3 output, change the frequency of phase-shift microwave signal.
Wherein, the frequency of the output voltage of radio frequency source 8 equals the frequency of phase-shift microwave signal.The resonance wavelength of micro-ring wave filter 6 can be changed by thermo-optical electrode.
Because the present invention adopts a Mach-Zehnder modulators to produce the double-side band light signal of carrier wave suppression, and the method utilizing tunable micro-ring wave filter to carry out linear filter produces the light carrier of a frequency translation, with carry out the light carrier after phase shift through phase-modulator and carry out beat frequency and produce the stability microwave signal of telecommunication that amplitude fluctuation is little, Phase Continuation is adjustable high-quality exports, and the frequency of the microwave telecommunication exported number is also continuously adjustable.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a microwave Phase Shifting System for frequency-tunable, is characterized in that, comprising:
Laser, for exporting continuous light carrier signal;
Beam splitter, its input is connected with the output of described laser, for described continuous light carrier signal is divided into two-beam signal;
Intensity modulator, its first input end is connected to the first output of described beam splitter, second input of described intensity modulator is for receiving input voltage drive singal, 3rd input of described intensity modulator is for receiving bias voltage, for described intensity modulator being set to according to described bias voltage the operating state of carrier wave suppression, and according to described input voltage drive singal, light beam signal is modulated to the double-side band light signal of rear outgoing carrier suppression; The frequency of described input voltage drive singal equals the frequency of phase-shift microwave signal;
Phase-modulator, its first input end is connected to the second output of described beam splitter, second input of described phase-modulator, for receiving driving voltage, carries out phase-modulation for restrainting light signal according to described driving voltage to another and exports the light carrier after phase shift;
Bundling device, its first input end is connected to the output of described intensity modulator, second input of described bundling device is connected to the output of described phase-modulator, for the light carrier after described double-side band light signal and described phase shift being carried out conjunction ripple and exporting a branch of hybrid frequency light;
Tunable micro-ring wave filter, its input is connected to the output of described bundling device, for carrying out filtering to described hybrid frequency light, exports the carrier signal after a frequency translation and a dephased carrier signal; And
Photodetector, is connected to the output of described tunable micro-ring wave filter, for the carrier signal after described frequency translation and dephased carrier signal are carried out opto-electronic conversion and output phase shift microwave signal.
2. microwave Phase Shifting System as claimed in claim 1, is characterized in that, also comprise:
Radio frequency source, is connected to the second input of described intensity modulator, for providing described input voltage drive singal;
First DC source, is connected to the 3rd input of described intensity modulator, for providing described bias voltage; And
Second DC source, is connected to the second input of described phase-modulator, for providing described driving voltage.
3. microwave Phase Shifting System as claimed in claim 1 or 2, it is characterized in that, described intensity modulator is MZ Mach-Zehnder.
4. microwave Phase Shifting System as claimed in claim 3, it is characterized in that, the frequency of described input voltage drive singal equals the frequency of the phase-shift microwave signal that photodetector exports, and the amplitude of described input voltage drive singal equals the amplitude of the half-wave voltage of described MZ Mach-Zehnder; Described bias voltage is the half-wave voltage of described MZ Mach-Zehnder.
5. microwave Phase Shifting System as claimed in claim 3, it is characterized in that, described beam splitter, MZ Mach-Zehnder, phase-modulator and bundling device are that semi-conducting material is integrated in one.
6., based on a phase shifting method for the microwave Phase Shifting System described in any one of claim 1-5, it is characterized in that, comprise the steps:
S1: the half-wave voltage being equaled MZ Mach-Zehnder by the output voltage setting the first DC source, makes MZ Mach-Zehnder be operated in the operating state of carrier wave suppression;
S2: the laser that laser sends is a branch of after beam splitter beam splitting to be entered in MZ Mach-Zehnder, and another bundle enters phase-modulator;
S3: MZ Mach-Zehnder carries out dual-band frequency according to input voltage drive singal to light beam signal and moves; Phase-modulator carries out phase shift according to driving voltage to another bundle light signal;
S4: bundling device dual-band frequency is moved after light signal and dephased light signal carry out conjunction ripple after export hybrid frequency light;
S5: tunable micro-ring wave filter carries out filtering to described hybrid frequency light and the carrier signal exported after a frequency translation and a dephased carrier signal;
S6: photodetector carries out opto-electronic conversion to the carrier signal after frequency translation and dephased carrier signal and obtains phase-shift microwave signal.
7. phase shifting method as claimed in claim 6, is characterized in that, also comprise the steps:
By the size changing the driving voltage that the second DC source exports, the phase place of phase-shift microwave signal is changed.
8. phase shifting method as claimed in claims 6 or 7, is characterized in that, also comprise the steps:
By changing the frequency of described input voltage drive singal and changing the resonance wavelength of tunable micro-ring wave filter, make the resonance frequency of tunable micro-ring wave filter equal any one single order sideband in two single order sidebands of MZ Mach-Zehnder output, change the frequency of phase-shift microwave signal.
9. phase shifting method as claimed in claim 8, it is characterized in that, the frequency of described input voltage drive singal equals the frequency of phase-shift microwave signal.
10. phase shifting method as claimed in claim 8, be is characterized in that, changed the resonance wavelength of micro-ring wave filter by thermo-optical electrode.
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