CN110138455A - A kind of microwave photon radio-frequency phase shifter and its phase-moving method based on spectral manipulation - Google Patents
A kind of microwave photon radio-frequency phase shifter and its phase-moving method based on spectral manipulation Download PDFInfo
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- CN110138455A CN110138455A CN201910405670.4A CN201910405670A CN110138455A CN 110138455 A CN110138455 A CN 110138455A CN 201910405670 A CN201910405670 A CN 201910405670A CN 110138455 A CN110138455 A CN 110138455A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/5165—Carrier suppressed; Single sideband; Double sideband or vestigial
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
Abstract
The invention discloses a kind of microwave photon radio-frequency phase shifter and its phase-moving method based on spectral manipulation, which includes laser source, optical modulator, fiber amplifier, spectral manipulation system, photodetector and photo-coupler.The light amplification signal incidence of fiber amplifier on the diffraction grating, and is separated into a plurality of reflection light.On the different pixels point that spectral components were different in a plurality of reflection light are incident upon every row, on the identical different pixels point for being incident upon each column of spectral components.The amplitude and phase of laser treatment device modulated spectrum component, and form multiple beat frequency light waves.Each photo-coupler Spectral beam combining light carrier and single order modulation sideband, generate optical SSB modulation signal.Optical SSB modulation signal beat frequency in photodetector generates radiofrequency signal.The present invention effectively inhibits the phase noise of photon radio-frequency phase shifter, realizes photon radio-frequency phase shift function, it can be achieved that scanning at any angle, flexibility is high and restructural, suitable for extensive phased-array radar.
Description
Technical field
The present invention relates to a kind of phase shifter in spectral processing techniques field more particularly to a kind of microwaves based on spectral manipulation
Photon radio-frequency phase shifter further relates to the microwave photon RF phase shifter side based on spectral manipulation of the microwave photon radio-frequency phase shifter
Method.
Background technique
Phase shifter makes a kind of device that can be adjusted to the phase of wave, is Wave beam forming phased-array radar, satellite
Primary Component in system, radio over fibre system is applied in missile attitude control, accelerator, communication, instrument and meter even sound
The fields such as happy.The performance indicator of phase shifter directly affects the anti-interference ability of these equipment and the weight of sensitivity and system
Amount, volume and cost, therefore study phase shifter and militarily have great importance with Civil Satellite Communication field.
Any transmission medium can all introduce phase shift in the fluctuation wherein conducted, this is the principle of early simulation phase shifter,
And existing phase shifter realizes digital phase shift using A/D, D/A conversion.But although existing phase shifter can effectively inhibit color
It dissipates, but phase noise can be introduced in this way, and the phase of light wave variation of phase fluctuation and the fibre-optical dispersion introducing of light source all can
So that spectral manipulation system is generated phase error hiding, leads to serious phase noise.In addition, existing phase shifter is difficult to realize full-shape
The scanning of degree, flexibility are insufficient, even and if carry out the scanning of full angle, phase jitter and RF signal amplitude variation all can
It is very big, it is unable to satisfy the application demand of large-scale phased-array radar.
Summary of the invention
Problem in view of the prior art, the present invention provide a kind of microwave photon radio-frequency phase shifter based on spectral manipulation and its
Phase-moving method solves existing phase shifter and generates serious phase noise, and is difficult to realize the scanning of full angle, flexibility
Insufficient problem.
The present invention is implemented with the following technical solutions: a kind of microwave photon radio-frequency phase shifter based on spectral manipulation, packet
It includes:
Laser source；
Optical modulator is used to modulate the optical signal that the laser source issues, to generate light modulating signal；
Fiber amplifier is used to amplify the light modulating signal, to generate light amplification signal；
Spectral manipulation system is used to carry out phase shift processing to the light amplification signal, to generate light phase shift signal；And
Multiple photodetectors are used to the smooth phase shift signal being converted to corresponding radiofrequency signal；
Wherein, the optical signal is carried out voltage bias by the optical modulator, and the maximum output point biased inhibits even number
The light double-sideband of rank sideband is modulated, and obtains the light modulating signal of double-side band；
The spectral manipulation system includes liquid crystal on silicon and diffraction grating；The liquid crystal on silicon includes LCoS array and laser
Processor, the LCoS array include an input port and multiple output ports；The light amplification signal passes through the input
Port is incident on the diffraction grating, and is separated into a plurality of reflection light by spectrum on the diffraction grating；Spectral components
Different reflection lights is incident upon on the different pixels point of every row in the laser treatment device, the identical reflection light of spectral components
It is incident upon on the different pixels point of each column in the laser treatment device；The folding that the laser treatment device passes through each pixel of adjusting
Penetrate rate, modulate the amplitude and phase of corresponding spectral components, with the phase between compensated spectrum component, and formed respectively with it is multiple
The corresponding multiple beat frequency light waves of output port；Wherein, the beat frequency light wave is light carrier or single order modulation sideband,；
The microwave photon radio-frequency phase shifter further include:
Multiple photo-couplers, it is corresponding with multiple photodetectors respectively；Corresponding two output ports of each photo-coupler,
And described two output ports export a corresponding light carrier and a corresponding single order modulation sideband, respectively；Each optical coupling
Device is used for the corresponding light carrier of Spectral beam combining and corresponding single order modulation sideband, generates an optical SSB modulation signal；It is described
Optical SSB modulation signal beat frequency in corresponding photodetector generates the radiofrequency signal, and the radiofrequency signal is after amplification
For driving the optical modulator.
As a further improvement of the foregoing solution, the microwave photon radio-frequency phase shifter further include:
Microwave amplifier is used to amplify the radiofrequency signal, and drive of the amplified signal as the optical modulator
Dynamic signal.
As a further improvement of the foregoing solution, the microwave photon radio-frequency phase shifter further include:
Vector network analyzer is used to test the phase and amplitude of the radiofrequency signal.
As a further improvement of the foregoing solution, the light field of the optical SSB modulation signal are as follows:
Wherein, AcAnd AsThe amplitude of the respectively described light carrier, the single order modulation sideband, ωcAnd ωmIt is respectively described
The angular frequency of light carrier, the single order modulation sideband, p are noise frequency offset, and A (p) is noise amplitude,For random phase
Position；A (p) andIt is stochastic variable, A (p) Rayleigh distributed,Distribution of mean value is obeyed, and
Further, the beat frequency product of the optical SSB modulation signal are as follows:
Wherein, sin (ωmT+ Φ) it is the radiofrequency signal, Φ is the phase of the radiofrequency signal；PNpIt is inclined for noise frequency
Phase noise caused by beat frequency when shifting is p, andL is the dispersive optical fiber length of fiber amplifier.
As a further improvement of the foregoing solution, the laser source is multi-wavelength outside cavity gas laser, and line width is 100kHz,
Wavelength tuning is 1549.576nm.
As a further improvement of the foregoing solution, the optical modulator is lithium niobate MZ Mach-Zehnder, and half-wave
Modulation voltage VπFor 5.8V.
Further, the microwave amplifier is JSM-KFD76C amplifier, and bias voltage is Vπ/ 2, VπFor the light
The half-wave modulation voltage of modulator.
Still further, the photodetector is Optilab PD-30 photodetector, the vector network analyzer
For Agilent 8720ES vector network analyzer.
The microwave photon RF phase shifter method based on spectral manipulation that the present invention also provides a kind of is applied to above-mentioned any institute
In the microwave photon radio-frequency phase shifter based on spectral manipulation stated, and for carrying out phase shift processing, packet to multiple wavelength optical signal
Include following steps:
Voltage bias is carried out to the optical signal, and the maximum output point biased inhibits the light double-sideband tune of even-order sideband
System, and obtain the light modulating signal of double-side band；
Amplify the light modulating signal by fibre circuit, to obtain light amplification signal；
By the light amplification Signal separator a plurality of reflection light different at wavelength, make the reflection light that spectral components are different
It is incident upon on the different pixels point of every row in the laser treatment device, the identical reflection light of spectral components is incident upon the laser
In processor on the different pixels point of each column；
By adjusting the refractive index of each pixel, the amplitude and phase of corresponding spectral components are modulated, with compensated spectrum
Phase between component, and form multiple beat frequency light waves corresponding with multiple output ports respectively；Wherein, the beat frequency light wave is
Light carrier or single order modulation sideband,；
Spectral beam combining light carrier and corresponding single order modulation sideband, generate an optical SSB modulation signal；
Optical SSB modulation signal beat frequency in the photodetector is set to generate radiofrequency signal, and by the radiofrequency signal
The optical modulator is driven after amplification.
Microwave photon radio-frequency phase shifter and its phase-moving method based on spectral manipulation of the invention, the laser source of the phase shifter
The optical signal of sending is injected on diffraction grating after being amplified by optical modulator and fiber amplifier modulation, and further from diffraction light
A plurality of reflection light is separated on grid, on the different pixels point that spectral components were different in these reflection lights are incident upon every row,
And on the identical different pixels point for being incident upon each column of spectral components, laser treatment device further passes through the refraction for adjusting pixel
Rate, to realize the amplitude and phase of modulated spectrum component, the phase between compensated spectrum component forms multiple beat frequency light waves.
In the present invention, the light carrier and single order modulation sideband, that photo-coupler can export corresponding two output ports carry out spectrum conjunction
At, optical SSB modulation signal is generated, and optical SSB modulation signal beat frequency in photodetector generates driving light modulation
The radiofrequency signal of device.The present invention reconfigures different spectral components by spectral processing techniques to constitute different optical SSB letters
Number, the amplitude of each spectral components, phase-modulation are optimized excessively between two participation beat frequency light waves of optical SSB signal
Phase, while compensate the error hiding of phase between each spectral components come inhibit dispersion introduce phase noise, to generate
The controllable radiofrequency signal of low phase noise, phase further considers that the amplitude and phase of spectral components are accurately controlled to phased
Array antenna carries out array equilibrium or weighting processing, scanning beam main lobe gain, suppressed sidelobes can be improved in this way, to improve light
Control the system performance of beam-forming network.Moreover, the present invention replaces existing dispersion compensation by way of spectral manipulation, have
The advantages that tunable, restructural, reduces the influence of fibre-optical dispersion, thus effectively inhibit the phase noise of photon radio-frequency phase shifter,
It realizes photon radio-frequency phase shift function simultaneously, and can realize 0~360 ° of continuous phase control of 15GHz signal, phase jitter is small
In 2 degree, the amplitude variation of radiofrequency signal is less than 2.2dB, to guarantee the power consistency of radiofrequency signal.Phase shifter of the invention
The beam-forming network of composition can theoretically realize and scan at any angle that flexibility is high and restructural, be suitable for extensive
In phased-array radar.
Detailed description of the invention
Fig. 1 is that the signal of the microwave photon radio-frequency phase shifter based on spectral manipulation of the embodiment of the present invention 1 transmits figure；
Fig. 2 is the output light spectrogram of the laser source of the phase shifter in Fig. 1；
Fig. 3 is angle and wavelength accompanying drawings when the reflection light of the phase shifter in Fig. 1 leaves diffraction grating；
Fig. 4 is two light carriers of the phase shifter in Fig. 1 and the original combined schematic diagram of four noise sidebands；
Fig. 5 is the combination diagram of two light carriers and four noise sidebands after dispersive medium transmission in Fig. 4；
Fig. 6 is the combination diagram of two light carriers and four noise sidebands after spectral manipulation in Fig. 5；
Fig. 7 is the combination diagram of two light carriers and four noise sidebands after photodetection in Fig. 6；
Fig. 8 is the microwave photon signal processing basic schematic diagram of the phase shifter in Fig. 1；
Fig. 9 is the system framework figure of the microwave photon radio-frequency phase shifter based on spectral manipulation of the embodiment of the present invention 2；
Figure 10 is the plain edge that the coupling of the microwave photon radio-frequency phase shifter based on spectral manipulation of the embodiment of the present invention 2 is formed
Waveform diagram with modulated signal；
Figure 11 is that the beat frequency spectrum phase of the microwave photon radio-frequency phase shifter based on spectral manipulation of the embodiment of the present invention 2 is poor
When being zero, the waveform diagram of the amplitude and phase of RF signal；
Figure 12 is that the beat frequency spectrum phase of the microwave photon radio-frequency phase shifter based on spectral manipulation of the embodiment of the present invention 2 is poor
When for 0.5rad, the waveform diagram of the amplitude and phase of RF signal；
Figure 13 is the microwave photon radio-frequency phase shifter based on spectral manipulation of the embodiment of the present invention 2 in different light phase tune
The phase characteristic curve figure obtained in the case of system；
Figure 14 is that the experimental results of the microwave photon radio-frequency phase shifter based on spectral manipulation of the embodiment of the present invention 2 show
It is intended to.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
Embodiment 1
Referring to Fig. 1, present embodiments providing a kind of microwave photon radio-frequency phase shifter based on spectral manipulation, the phase shifter
Including laser source, optical modulator, fiber amplifier, spectral manipulation system, multiple photodetectors and multiple photo-couplers.
Laser source is multiwavelength laser source (Laser), and for issuing optical signal.In the present embodiment, laser source is more
Wavelength outside cavity gas laser, and line width is 100kHz, wavelength tuning 1549.576nm.Preferably, outside cavity gas laser is
Southern Photonics TLS150 laser.The noise of laser source mostlys come from spontaneous radiation effect, this will lead to defeated
Laser has frequency limit spectral width, also referred to as laser linewidth out.Carrier concentration variation in semiconductor material leads to light
The variation of gain and refractive index, the coupling between refractive index and gain will generate interaction between luminous intensity and phase is made an uproar
Sound.As shown in Fig. 2, the limited spectrum width of laser source is considered as Lorentz function.The frequency spectrum of the light wave of laser source output can
It is made of with regarding as an ideal single-frequency light wave and many narrowband Gaussian noises, these narrowband Gaussian noises can be expressed as being permitted
The sinusoidal signal that more amplitude and phase change at random.
Optical modulator is used for the optical signal that modulated laser source issues, to generate light modulating signal.Optical modulator is by optical signal
Voltage bias is carried out, and the maximum output point biased inhibits the light double-sideband modulation of even-order sideband, and obtains the light of double-side band
Modulated signal.In the present embodiment, optical modulator is lithium niobate MZ Mach-Zehnder (MZM), and half-wave modulation voltage Vπ
For 5.8V.
Fiber amplifier is for amplifying light modulating signal, to generate light amplification signal.In the present embodiment, fiber amplifier
For erbium-doped fiber amplifier (EDFA), the light amplification signal generated after fiber amplifier amplification can be entered in spectral manipulation system
Carry out spectral manipulation.
Spectral manipulation system is used to carry out phase shift processing to light amplification signal, to generate light phase shift signal.Wherein, at spectrum
Reason system includes liquid crystal on silicon and diffraction grating 16.Liquid crystal on silicon includes LCoS array and laser treatment device, and LCoS array includes
One input port and multiple output ports (i.e. output port 1 shown in Fig. 1, output port 2, output port
N), the two-dimentional liquid crystal on silicon array 7 of laser treatment device setting.The transverse coordinate axis of liquid crystal on silicon array 7 is in Fig. 1
Wavelength axis, i.e. wavelength axis, and longitudinal coordinate axle is Displacement axis, i.e. offset axis.Light amplification signal
It is incident on diffraction grating 16 by input port, and is separated into a plurality of reflection light by spectrum on diffraction grating 16.Here,
The different reflection light of spectral components is incident upon on the different pixels point of every row in two-dimentional liquid crystal on silicon array 7, spectral components phase
Same reflection light is incident upon on the different pixels point of each column in two-dimentional liquid crystal on silicon array 7.Laser treatment device is by adjusting two
The refractive index for tieing up each pixel of liquid crystal on silicon array 7, modulates the amplitude and phase of corresponding spectral components, with compensated spectrum
Phase between component, and form multiple beat frequency light waves corresponding with multiple output ports respectively.Wherein, beat frequency light wave is light load
Wave or single order modulation sideband,.
Referring to Fig. 3, the reflecting grating that diffraction grating 16 can be reflection is also possible to the transmission grids of transmission, diffraction is used
The process of the separation of grating 16 and composite wavelength is parallel, and is then serial with fiber bragg grating separation wavelength.At this
In embodiment, reflecting grating is carved with fine parallel scores on the reflecting surface, these indentations be it is equally spaced, light can be with certain
Angle leaves grating.The angle that light leaves grating is related to optical wavelength, and reflected light presses spectrum fan out.Each wavelength
There can be reception optical fiber in reflecting grating focal position, wavelength each in this way can be directed toward with a slightly different angle reflection
Independent optical fiber.In turn, the light of different wave length enters reflecting grating by different input optical fibres, they can also pass through reflection
Grating one optical fiber of compound return.And when adjusting the refractive index of pixel, the present embodiment can be controlled by voltage to be changed often
The refractive index of one pixel carries out phase-modulation to light to change phase of light wave, modulated light wave will be returned and be exported
To specified fiber array output port, thus can complete several spectral components simultaneously spectral manipulation.
In the present embodiment, there are narrowband Gaussian noise, light fields for each spectral components of optical SSB modulation signal
It indicates are as follows:
Wherein, AcAnd AsThe respectively amplitude of light carrier, single order modulation sideband, ωcAnd ωmRespectively light carrier, a contrast
The angular frequency of sideband processed, p are noise frequency offset, and A (p) is noise amplitude,For random phase.A (p) andBe with
Machine variable, A (p) Rayleigh distributed,Distribution of mean value is obeyed, and
Two ideal light wave beat frequencies generate an ideal radiofrequency signal (RF signal), and ideal light wave is made an uproar with Gauss
Sound sideband beat frequency will generate phase noise.In order to facilitate discussion, it is assumed here that each light wave includes a pair of of narrowband Gaussian noise.Cause
This two beat frequency light waves can be expressed as the combination of two light carriers and four noise sidebands, as shown in Figure 4.
Without dispersion, light carrier ωcWith single order sideband ωc+ωmIt is ω that frequency, which can be obtained, in direct detectionm's
RF signal.Light carrier ωcWith noise sideband ωc+ωm+ p beat frequency, noise sideband ωc- p and single order sideband ωc+ωmBeat frequency all produces
Raw frequency is ωmThe noise sideband of+p, but their amplitude is different, opposite in phase, and the two amplitude can be made by spectral manipulation
It is identical and cancel out each other.Similarly, light carrier ωcWith noise sideband ωc+ωm- p beat frequency, noise sideband ωc+ p and single order sideband ωc
+ωmIt is ω that beat frequency, which all generates frequency,mThe noise sideband of-p, their amplitude difference, opposite in phase, can also pass through spectral manipulation
Make frequency ωmThe noise sideband of+p is cancelled out each other.What needs to be explained here is that having ignored two according to the statistical property of noise
Beat frequency product between noise sideband.
And situation is increasingly complex under conditions of having dispersion, because different spectral components will produce after dispersive optical fiber transmits
Raw different phase change, it is meant that each noise sideband cannot simply cancel out each other, after dispersive optical fiber transmits
Spectrum is as shown in Figure 5.At this moment the parallel processing advantage of spectral manipulation can be given full play to, respectively to each spectral components at
Reason, keeps light carrier identical with the amplitude of single order sideband, phase difference Φ is constant.
The quantity of photodetector (PD) be it is multiple, be used to light phase shift signal being converted to corresponding radiofrequency signal.?
In the present embodiment, photodetector is Optilab PD-30 photodetector.The principle of photodetector be caused by radiation by
Irradiation material electric conductivity changes, and optical signal can be converted into electric signal, to realize the conversion of signal type.Photodetection
Device can have detection array and multiple detection array elements, the relatively multiple output port settings of detection array, and multiple detection array elements are set
It sets in detection array.
Multiple photo-couplers (OC) are corresponding with multiple photodetectors respectively, and corresponding two output ends of each photo-coupler
Mouthful, and two output ports export a corresponding light carrier and a corresponding single order modulation sideband, respectively.Each optical coupling
Device is used for the corresponding light carrier of Spectral beam combining and corresponding single order modulation sideband, generates an optical SSB modulation signal.Light list
Sideband modulated signal beat frequency in corresponding photodetector generates radiofrequency signal, and radiofrequency signal is used to drive light tune after amplification
Device processed.Wherein, multiple detection array elements are corresponding with multiple photo-couplers respectively, and each detection array element is for detecting corresponding optical coupling
The optical SSB modulation signal of device output, and generate radiofrequency signal.
It is set to pass through the frequency that photodetection beat frequency generates what needs to be explained here is that carrying out phase compensation to each noise sideband
Rate is ωm+ p and ωmThe noise sideband amplitude of-p is identical, opposite in phase, as shown in Fig. 6 and Fig. 7.
If after the dispersive optical fiber transmission that length is L, frequency ωmThe noise component(s) of+p can indicate are as follows:
In formula, β1And β2Respectively single order, second-order dispersion transmission.Due to β2ωmIt is pL usually very small, thus it is above-mentioned
Formula can be with approximate representation are as follows:
Whole noise sidebands is considered, by spectral manipulation, the beat frequency product of optical SSB modulation signal are as follows:
Wherein, sin (ωmT+ Φ) it is radiofrequency signal, Φ is the phase of radiofrequency signal, and by light carrier and single order sideband
Phase difference determines.PNpFor noise frequency offset be p when beat frequency caused by phase noise, andL is
The dispersive optical fiber length of fiber amplifier.
By above analysis, in order to reduce the phase noise of dispersion introducing, the present embodiment is mended by spectral processing techniques
The phase mismatch repaid between noise sideband makes to cancel out each other between them, and controls the phase between light carrier and single order sideband
Variation makes its beat frequency generate the controllable RF signal of phase.And spectral manipulation is the one of the analysis and design of microwave photon signal processing
As method, this method indicates signal with spectrum shape, explores arbitrary signal and be transmitted across in different electric light/light-to-current inversions and system
Spectral evolution rule in journey, to establish system model, obtain the life of transmission signal and each frequency component go out, growth and decline situation,
And specific influence of the physical effects such as dispersion on each frequency component.Spectral manipulation utilizes the Evolution of frequency spectrum itself, right
Spectrum component carries out concrete operations, to realize microwave photon signal processing function, and compensation and system to signal impairment
The raising of performance.
Referring to Fig. 8, the figure describes the microwave photon signal processing base of the microwave photon radio-frequency phase shifter of the present embodiment
Present principles.Input signal E (t) first transforms to area of light, signal E in the form of frequency spectrum by time domain through light-to-current inversioninIt indicates, by light
Spectral space resolution element is by EinEach spectral components be separated to corresponding spatial position, it is right by spectral manipulation module (optical modulator)
The light of different location carries out amplitude and phase modulation, finally again by spatial spectral synthin (multiple photo-couplers) by separation
Spectral beam combining, treated spectrum EoutLight-to-current inversion is carried out again exports the signal E ' (t) intentionally got.Thus it can establish
System model of the signal in different photoelectricity/electro-optic conversions, processing and transmission process, by analyzing some fundamental physical quantities pair
The influence sophisticated systems function of a spectrum component simultaneously improves system performance index.
In conclusion the microwave photon radio-frequency phase shifter based on spectral manipulation of the present embodiment has the advantage that
The optical signal that the laser source of the phase shifter issues is spread out by injecting after optical modulator and fiber amplifier modulation amplification
It penetrates on grating 16, and is further separated into a plurality of reflection light from diffraction grating 16, spectral components are not in these reflection lights
On the same different pixels point for being incident upon every row, and on the identical different pixels point for being incident upon each column of spectral components, at laser
Reason device further passes through the refractive index for adjusting pixel, thus realize the amplitude and phase of modulated spectrum component, compensated spectrum point
Phase between amount forms multiple beat frequency light waves.In the present embodiment, photo-coupler can export corresponding two output ports
Light carrier and single order modulation sideband, carry out Spectral beam combining, generate optical SSB modulation signal, and the optical SSB modulation signal
Beat frequency generates the radiofrequency signal of driving optical modulator in photodetector.The present embodiment is reconfigured by spectral processing techniques
Different spectral components constitute different optical SSB signals, optimize excessively to the amplitude of each spectral components, phase-modulation
Two of optical SSB signal participate in the phase between beat frequency light wave, while compensating the error hiding of phase between each spectral components
Phase noise to inhibit dispersion to introduce further considers spectrum to generate the controllable radiofrequency signal of low phase noise, phase
The amplitude and phase of component are accurately controlled to carry out array equilibrium or weighting processing to phased array antenna, and scanning can be improved in this way
Beam main lobe gain, suppressed sidelobes, to improve the system performance of optical controlled beam forming network.Moreover, the present embodiment passes through light
The mode of spectrum processing replaces existing dispersion compensation, has many advantages, such as tunable, restructural, reduces the influence of fibre-optical dispersion, from
And effectively inhibit the phase noise of photon radio-frequency phase shifter, while realizing photon radio-frequency phase shift function, guarantee the function of radiofrequency signal
Rate consistency.
Embodiment 2
Referring to Fig. 9, present embodiments providing a kind of microwave photon radio-frequency phase shifter based on spectral manipulation, implementing
Microwave amplifier and vector network analyzer are increased on the basis of example 1.Microwave amplifier amplifies for amplifying radiofrequency signal
Driving signal of the signal afterwards as optical modulator.Vector network analyzer is used to test the phase and amplitude of radiofrequency signal,
It can measure the energy of radiofrequency signal.Wherein, microwave amplifier is JSM-KFD76C amplifier, and bias voltage is Vπ/ 2, VπFor light
The half-wave modulation voltage of modulator.Vector network analyzer is Agilent 8720ES vector network analyzer.
The present embodiment carries out phase shift experiment, and the Waveshaper 4000s of Finisar company is utilized to complete spectrum in experiment
Processing function is to carry out experimental verification.Waveshaper4000s is the high-resolution light processing platform based on LCoS, covers C wave
Section is with L-band, it can be achieved that the accurate control of any filter center wavelength, bandwidth, amplitude frequency characteristic, phase frequency characteristic.Filter band
Wide variation range is 10GHz to 9THz, and minimum resolution is 1GHz (8pm), amplitude fading control range 0-35dB, insertion loss
About 6.5dB, return loss are greater than 25dB.
In the experimental program of the present embodiment, light carrier and two modulation sideband,s are projected onto 2-D in Waveshaper
On the different pixels point of the every a line of LCoS, the refractive index of different pixels point is controlled by voltage to change corresponding spectral components
Amplitude and phase, and it is output to specified output port.Light carrier and modulation sideband, after Waveshaper spectral manipulation
It reconfigures and constitutes optical SSB modulation signal, that is, select light carrier therein and a modulation sideband, to constitute SSB signal, such as scheme
Shown in 10.
Photodetector detects to obtain the RF signal of a required phase bit, amplitude, and the present embodiment utilizes vector network point
The phase of analyzer test analysis RF signal, amplitude characteristic.Experiment keeps participating in the phase invariant of two spectral components of beat frequency, i.e.,
The two phase difference is zero, and the amplitude and phase of the RF at this moment measured are as shown in figure 11, it is seen that RF signal amplitude is held essentially constant,
Phase is -94.878 degree, and phase jitter is less than 2 degree.
Using Waveshaper spectral manipulation platform, make the phase difference 0.5rad for participating in two spectral components of beat frequency
When, the amplitude and phase for testing the RF signal measured in this way are as shown in figure 12.At this point, the signal amplitude of RF signal is kept not substantially
Become, but phase is -69.068 degree, phase jitter is less than 2 degree.
Equally, make participate in beat frequency spectral components phase difference be respectively 1.0rad, 1.5rad, 2.0rad, 2.5rad,
When 3.0rad, 3.5rad, 4.0rad, 4.5rad, 5.0rad, 5.5rad, 6.0rad, the phase of the RF signal of test is respectively-
45.386°、-20.981°、8.2521°、37.035°、68.824°、99.8°、128.55°、159.82°、-175.01°、-
149.69°,-124.59°.Comprehensive analysis above data, the phase for the photon radio-frequency phase shifter that available experiment is realized, width
Spend characteristic, i.e., when participate in beat frequency spectral components phase difference be respectively 0rad, 0.5rad, 1.0rad, 1.5rad, 2.0rad,
The phase that is obtained when 2.5rad, 3.0rad, 3.5rad, 4.0rad, 4.5rad, 5.0rad, 5.5rad, 6.0rad, amplitude characteristic,
As shown in Figure 13 and Figure 14.The phase controlling precision of Waveshaper 4000s can achieve 0.01rad, so program energy
Enough realize the quasi-continuous tuning of phase.
As shown in figure 13, the phase characteristic curve obtained in different light phase modulation, it is seen that when participation beat frequency
Spectral components phase difference be respectively 0rad, 0.5rad, 1.0rad, 1.5rad, 2.0rad, 2.5rad, 3.0rad, 3.5rad,
When 4.0rad, 4.5rad, 5.0rad, 5.5rad, 6.0rad, the phase of RF signal changes therewith, although light phase difference take it is discrete
Value, but it is continuously adjustable to predict 0-360 ° of phase of RF signal, and phase jitter is less than 2 °.As shown in figure 14, in phase
During tuning, the amplitude of RF signal is held essentially constant, and the amplitude variation of measurement is less than 2.2dB.Although being used in experiment
For 15GHz signal as test signal, this method is equally applicable the signal of other high frequencies, if corresponding electrooptic modulator and
Photodetector bandwidth is met the requirements.
It can be seen that the phase Φ of the photon radio-frequency phase shifter output RF signal of the present embodiment is modulated by light carrier and single order
The phase difference of sideband determines, can flexibly be controlled by spectral manipulation.The phase shifter of the present embodiment can realize 15GHz signal 0~
360 ° of continuous phase controls, phase jitter is less than 2 degree, and the amplitude variation of radiofrequency signal is less than 2.2dB, to guarantee radiofrequency signal
Power consistency.The beam-forming network that the phase shifter of the present embodiment is constituted can theoretically be realized to be scanned at any angle, spirit
It is active high and restructural, suitable for extensive phased-array radar.
It is further to note that spectral manipulation is for other processing techniques, there is broadband, high frequency, transparent, easy
In technical advantages such as integrated and parallel processings, but also there is the disadvantages of processing granularity is big, loss is big, and stability is insufficient simultaneously.Therefore,
It is contemplated that spectral manipulation is combined with microwave photon link in some other embodiment, by the design of necessary system and
It is integrated, the negative effect of spectral manipulation bring is reduced, further plays spectral manipulation to the advantage of microwave photon signal processing.
Embodiment 3
A kind of microwave photon RF phase shifter method based on spectral manipulation is present embodiments provided, can be applied to embodiment
1 or embodiment 2 the microwave photon radio-frequency phase shifter based on spectral manipulation in, and for multiple wavelength optical signal carry out phase shift at
Reason comprising following steps:
Step 1 carries out voltage bias to optical signal, and the maximum output point biased inhibits the light double-sideband of even-order sideband
Modulation, and obtain the light modulating signal of double-side band；
Step 2 amplifies light modulating signal by fibre circuit, to obtain light amplification signal；
Step 3, by the light amplification Signal separator a plurality of reflection light different at wavelength, make the reflected light that spectral components are different
Line is incident upon on the different pixels point of every row in laser treatment device, and the identical reflection light of spectral components is incident upon laser treatment device
On the different pixels point of middle each column；
Step 4, the refractive index by adjusting each pixel, modulate the amplitude and phase of corresponding spectral components, to mend
The phase between spectral components is repaid, and forms multiple beat frequency light waves corresponding with multiple output ports respectively；Wherein, beat frequency light wave
For light carrier or single order modulation sideband,；
Step 5, Spectral beam combining light carrier and corresponding single order modulation sideband, generate an optical SSB modulation signal；
Step 6 makes optical SSB modulation signal beat frequency in photodetector generate radiofrequency signal, and radiofrequency signal is existed
Optical modulator is driven after amplification.
Embodiment 4
The present embodiment provides a kind of terminals comprising memory, processor and storage are on a memory and can
The computer program run on a processor.Processor realizes the microwave light based on spectral manipulation of embodiment 3 when executing program
The step of sub- RF phase shifter method.
The method of embodiment 3 is such as designed to independently operated program in use, can be applied in the form of software,
On computer terminals, terminal can be computer, smart phone and other internet of things equipment etc. for installation.Embodiment 3
Method can also be designed to the program of embedded operation, installation on computer terminals, is such as mounted on single-chip microcontroller.
Embodiment 5
The present embodiment provides a kind of computer readable storage mediums, are stored thereon with computer program.Program is by processor
When execution, realize embodiment 3 the microwave photon RF phase shifter method based on spectral manipulation the step of.
The method of embodiment 3 is such as designed to computer-readable storage medium in use, can be applied in the form of software
Matter can independently operated program, computer readable storage medium can be USB flash disk, is designed to U-shield, be designed to by USB flash disk by outer
Start the program of entire method in triggering.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of microwave photon radio-frequency phase shifter based on spectral manipulation comprising:
Laser source；
Optical modulator is used to modulate the optical signal that the laser source issues, to generate light modulating signal；
Fiber amplifier is used to amplify the light modulating signal, to generate light amplification signal；
Spectral manipulation system is used to carry out phase shift processing to the light amplification signal, to generate light phase shift signal；And
Multiple photodetectors are used to the smooth phase shift signal being converted to corresponding radiofrequency signal；
It is characterized in that, the optical signal is carried out voltage bias by the optical modulator, and the maximum output point biased inhibits even
The light double-sideband modulation of number rank sideband, and obtain the light modulating signal of double-side band；
The spectral manipulation system includes liquid crystal on silicon and diffraction grating；The liquid crystal on silicon includes LCoS array and laser treatment
Device, the LCoS array include an input port and multiple output ports；The light amplification signal passes through the input port
It is incident on the diffraction grating, and is separated into a plurality of reflection light by spectrum on the diffraction grating；Spectral components are different
Reflection light be incident upon on the different pixels point of every row in the laser treatment device, spectral components identical reflection light projection
In the laser treatment device on the different pixels point of each column；The refraction that the laser treatment device passes through each pixel of adjusting
Rate modulates the amplitude and phase of corresponding spectral components, with the phase between compensated spectrum component, and formed respectively with it is multiple defeated
The corresponding multiple beat frequency light waves of exit port；Wherein, the beat frequency light wave is light carrier or single order modulation sideband,；
The microwave photon radio-frequency phase shifter further include:
Multiple photo-couplers, it is corresponding with multiple photodetectors respectively；Corresponding two output ports of each photo-coupler, and institute
It states two output ports and exports a corresponding light carrier and a corresponding single order modulation sideband, respectively；Each photo-coupler is used
In the corresponding light carrier of Spectral beam combining and corresponding single order modulation sideband, an optical SSB modulation signal is generated；The light list
Sideband modulated signal beat frequency in corresponding photodetector generates the radiofrequency signal, and the radiofrequency signal is used for after amplification
Drive the optical modulator.
2. the microwave photon radio-frequency phase shifter based on spectral manipulation as described in claim 1, which is characterized in that the microwave light
Sub- radio-frequency phase shifter further include:
Microwave amplifier is used to amplify the radiofrequency signal, and amplified signal is believed as the driving of the optical modulator
Number.
3. the microwave photon radio-frequency phase shifter based on spectral manipulation as claimed in claim 2, which is characterized in that the microwave light
Sub- radio-frequency phase shifter further include:
Vector network analyzer is used to test the phase and amplitude of the radiofrequency signal.
4. the microwave photon radio-frequency phase shifter based on spectral manipulation as described in claim 1, which is characterized in that the light is unilateral
Light field with modulated signal are as follows:
Wherein, AcAnd AsThe amplitude of the respectively described light carrier, the single order modulation sideband, ωcAnd ωmThe respectively described light carries
The angular frequency of wave, the single order modulation sideband, p are noise frequency offset, and A (p) is noise amplitude,For random phase；A
(p) andIt is stochastic variable, A (p) Rayleigh distributed,Distribution of mean value is obeyed, and
5. the microwave photon radio-frequency phase shifter based on spectral manipulation as claimed in claim 4, which is characterized in that the light is unilateral
Beat frequency product with modulated signal are as follows:
Wherein, sin (ωmT+ Φ) it is the radiofrequency signal, Φ is the phase of the radiofrequency signal；PNpIt is for noise frequency offset
Phase noise caused by beat frequency when p, andL is the dispersive optical fiber length of fiber amplifier.
6. the microwave photon radio-frequency phase shifter based on spectral manipulation as described in claim 1, which is characterized in that the laser source
For multi-wavelength outside cavity gas laser, and line width is 100kHz, wavelength tuning 1549.576nm.
7. the microwave photon radio-frequency phase shifter based on spectral manipulation as described in claim 1, which is characterized in that the light modulation
Device is lithium niobate MZ Mach-Zehnder, and half-wave modulation voltage VπFor 5.8V.
8. the microwave photon radio-frequency phase shifter based on spectral manipulation as claimed in claim 2, which is characterized in that the microwave is put
Big device is JSM-KFD76C amplifier, and bias voltage is Vπ/ 2, VπFor the half-wave modulation voltage of the optical modulator.
9. the microwave photon radio-frequency phase shifter based on spectral manipulation as claimed in claim 3, which is characterized in that the photoelectricity is visited
Survey device is Optilab PD-30 photodetector, and the vector network analyzer is Agilent 8720ES vector network analysis
Instrument.
10. a kind of microwave photon RF phase shifter method based on spectral manipulation is applied to such as any one of claim 1-9
In the microwave photon radio-frequency phase shifter based on spectral manipulation, and for carrying out phase shift processing to multiple wavelength optical signal,
It is characterized in that comprising following steps:
Voltage bias is carried out to the optical signal, and the maximum output point biased inhibits the light double-sideband modulation of even-order sideband,
And obtain the light modulating signal of double-side band；
Amplify the light modulating signal by fibre circuit, to obtain light amplification signal；
By the light amplification Signal separator a plurality of reflection light different at wavelength, make the reflection light projection that spectral components are different
In the laser treatment device on the different pixels point of every row, the identical reflection light of spectral components is incident upon the laser treatment
In device on the different pixels point of each column；
By adjusting the refractive index of each pixel, the amplitude and phase of corresponding spectral components are modulated, with compensated spectrum component
Between phase, and form multiple beat frequency light waves corresponding with multiple output ports respectively；Wherein, the beat frequency light wave is light load
Wave or single order modulation sideband,；
Spectral beam combining light carrier and corresponding single order modulation sideband, generate an optical SSB modulation signal；
So that optical SSB modulation signal beat frequency in the photodetector is generated radiofrequency signal, and the radiofrequency signal is being put
The driving optical modulator after big.
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| CN113540950A (en) * | 2021-07-15 | 2021-10-22 | 中国人民解放军国防科技大学 | Electro-optic modulation depth real-time measurement and control system and method based on VIPA etalon |
| CN113540950B (en) * | 2021-07-15 | 2023-03-14 | 中国人民解放军国防科技大学 | Electro-optic modulation depth real-time measurement and control system and method based on VIPA etalon |
| CN114122728B (en) * | 2021-11-24 | 2024-04-26 | 中国人民解放军国防科技大学 | Uniform circular phased array direction finding method based on microwave photon phase shifter |
| CN114665972A (en) * | 2021-12-24 | 2022-06-24 | 中山大学 | Multi-subcarrier detection signal generation system for single-sideband modulation and carrier reservation |
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