CN107707309A - The orthogonal frequency mixing method of microwave photon, device based on cascade phase and light polarization modulator - Google Patents
The orthogonal frequency mixing method of microwave photon, device based on cascade phase and light polarization modulator Download PDFInfo
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- CN107707309A CN107707309A CN201710950881.7A CN201710950881A CN107707309A CN 107707309 A CN107707309 A CN 107707309A CN 201710950881 A CN201710950881 A CN 201710950881A CN 107707309 A CN107707309 A CN 107707309A
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- H—ELECTRICITY
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- 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
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- H04B10/505—Laser transmitters using external modulation
- H04B10/5051—Laser transmitters using external modulation using a series, i.e. cascade, combination of modulators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
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- H04B10/5161—Combination of different modulation schemes
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Abstract
The invention discloses a kind of orthogonal frequency mixing method of the microwave photon based on cascade phase and light polarization modulator.Radiofrequency signal and intrinsic signals are modulated on light carrier by this method respectively using the phase-modulator and light polarization modulator of cascade, generate the cascade modulated signal that the phase difference between two of which perpendicular polarisation state modulated signal is 90 °；Extract the single order single sideband singal of the cascade modulated signal and be classified as two-way；Then analyzing is carried out respectively to two-way single order single sideband singal using being polarized two analyzers that the angle of direction and the light polarization modulator main shaft polarization direction is 90 ° and 45 °；Finally carry out photodetection respectively to signal after two-way analyzing and remove the DC component in gained electric signal, obtain that a pair of amplitudes are identical, intermediate-freuqncy signal of quadrature in phase.The invention also discloses a kind of orthogonal mixer device of the microwave photon based on cascade phase and light polarization modulator.Compared with prior art, bandwidth of operation of the invention is higher, and structure is compacter, succinct.
Description
Technical field
The present invention relates to a kind of frequency mixing method, more particularly to a kind of orthogonal frequency mixing method of microwave photon.
Background technology
Orthogonal mixer is used to radiofrequency signal being converted into that a pair of amplitudes to be equal and the intermediate-freuqncy signal of quadrature in phase.It is orthogonal
Frequency mixer is the important component of many electronic systems now, and it can realize various functions, is such as used for radar system and realizes
Image interference suppresses, and the modulation and demodulation of complex format is realized for communication system, the detection of phase is realized for measuring system
Deng.
Compared to electric orthogonal mixer, microwave photon orthogonal mixer has big bandwidth and exempts from the advantages such as electromagnetic interference.Cause
This, the microwave orthogonal mixer realized based on photon technology is got growing concern for.The existing orthogonal mixing of microwave photon
Device can be divided into four classes.First kind scheme is that the program is by 90 degree of couplings of electricity based on electric 90 degree of couplers or electric phase shifter
Device or electric phase shifter, local oscillation signal are divided into mutually orthogonal two-way, then respectively with radiofrequency signal by cascaded modulator
Method realizes down coversion, and the Bandwidth-Constrained of this scheme is in electrical part.Second class scheme is based on micro-wave light quantum phase shifter, the party
Case is multiplexed MZ Mach-Zehnder by some special modulators, such as dual-polarization, and double parallel MZ Mach-Zehnder is double
Drive MZ Mach-Zehnder etc.；By adjusting direct current biasing or the polarization state direction of these modulators, to reach microwave light
The purpose of sub- phase shift, phase shifter is divided into two-way, the mobile phase for differing 90 degree, it is possible to obtain mutually orthogonal two-way intermediate frequency
Signal, program regulation process are more numerous and diverse.3rd class scheme is that the program is by 90 degree of couplings of light based on 90 degree of couplers of light
Clutch, 90 degree of phase shift difference is realized on light, the two-way intermediate-freuqncy signal of 90 degree of difference is can be obtained by by photodetection；So
And the shake of environment is larger to the stability influence of 90 degree of couplers of light.4th class scheme is based on optical delay line, the program
Using fiber delay time or effect of dispersion it is artificial introduce different phases on the light carrier of two interchannels or two different wave lengths
Position；By accurately controlling delay or dispersion measure, it is possible to 90 degree of phase differences are introduced as 90 degree of couplers of light, so as to realize just
Hand over mixing；And the program keeps orthogonal bandwidth limited because delay or dispersion all can radio frequency or local frequency and change.
The content of the invention
The technical problems to be solved by the invention are to overcome prior art insufficient, there is provided one kind is based on cascade phase and partially
Shake the orthogonal frequency mixing method of microwave photon and device of modulator, and its bandwidth of operation is higher, and structure is compacter, succinct.
It is of the invention specifically to solve above-mentioned technical problem using following technical scheme：
The orthogonal frequency mixing method of microwave photon based on cascade phase and light polarization modulator, using cascade phase-modulator and
Radiofrequency signal and intrinsic signals are modulated on light carrier by light polarization modulator respectively, generation two of which perpendicular polarisation state modulation letter
The cascade modulated signal that phase difference between number is 90 °；Extract the single order single sideband singal of the cascade modulated signal and by its point
For two-way；Then using being polarized two analyzings that the angle of direction and the light polarization modulator main shaft polarization direction is 90 ° and 45 °
Device carries out analyzing respectively to two-way single order single sideband singal；Finally carry out photodetection respectively to signal after two-way analyzing and remove
DC component in gained electric signal, obtains that a pair of amplitudes are identical, intermediate-freuqncy signal of quadrature in phase.
Further, methods described also includes the step that signal amplification is carried out to cascade modulated signal or single order single sideband singal
Suddenly.
Preferably, signal amplification is carried out using erbium-doped fiber amplifier.
Preferably, the single order single sideband singal of the light pass filter extraction cascade modulated signal is utilized.
Preferably, the DC component in electric signal is removed using block isolating device.
The orthogonal mixer device of microwave photon based on cascade phase and light polarization modulator, including：
Cascade modulating unit, it include cascade phase-modulator and light polarization modulator, for by radiofrequency signal with it is intrinsic
Signal is modulated on light carrier respectively, generates the level joint debugging that the phase difference between two of which perpendicular polarisation state modulated signal is 90 °
Signal processed；
Single-side belt extraction unit, for extracting the single order single sideband singal of the cascade modulated signal and being classified as two
Road；
Analyzing unit, the angle that direction and the light polarization modulator main shaft polarization direction are polarized for utilizing is 90 ° and 45 °
Two analyzers analyzing is carried out respectively to two-way single order single sideband singal；
Photodetection output unit, for carrying out photodetection respectively to signal after two-way analyzing and removing gained electric signal
In DC component, obtain that a pair of amplitudes are identical, intermediate-freuqncy signal of quadrature in phase.
Further, the single-side belt extraction unit also includes amplifier, for unilateral to cascade modulated signal or single order
Band signal carries out signal amplification.
Preferably, the amplifier is erbium-doped fiber amplifier.
Preferably, the single-side belt extraction unit utilizes the light pass filter extraction single order list for cascading modulated signal
Sideband signals.
Preferably, the photodetection output unit utilizes the DC component removed using block isolating device in electric signal.
Compared with prior art, technical solution of the present invention has the advantages that：
1) present invention realizes that the orthogonal mixing of microwave is carried out in area of light, avoids limitation and electromagnetism of the electrical part to bandwidth of operation
Interference；
2) present invention realizes that phase and mach zhender intensity are adjusted simultaneously using a light polarization modulator and a pair of analyzers
Function processed, structure are more succinct；
3) present invention passes through single Erbium-doped fiber amplifier respectively to same phase (I) with the amplification and filtering of orthogonal (Q) road signal
Device and optical band pass filter are realized, not only simplify structure, it is thus also avoided that may bring using different amplifiers or wave filter
Phase or amplitude mismatch problem.
Brief description of the drawings
Fig. 1 is the principle schematic diagram of orthogonal one specific embodiment of mixer device of the present invention；
Fig. 2 is a pair of 100-MHz intermediate-freuqncy signals that real-time oscilloscope measures；
Fig. 3 is the relation curve of intermediate-freuqncy signal power, phase mismatch size and rf frequency.
Embodiment
For the deficiency of the orthogonal frequency mixing technique of existing microwave photon, basic ideas of the invention are：Adjusted using cascade phase
The structure of device and light polarization modulator processed realizes one to realize microwave photon down conversion by the different analyzers for being polarized direction
Phase relation mutually orthogonal intermediate-freuqncy signal.
Specifically, the orthogonal mixer device of the microwave photon of the invention based on cascade phase and light polarization modulator, including：
Cascade modulating unit, it include cascade phase-modulator and light polarization modulator, for by radiofrequency signal with it is intrinsic
Signal is modulated on light carrier respectively, generates the level joint debugging that the phase difference between two of which perpendicular polarisation state modulated signal is 90 °
Signal processed；
Single-side belt extraction unit, for extracting the single order single sideband singal of the cascade modulated signal and being classified as two
Road；
Analyzing unit, the angle that direction and the light polarization modulator main shaft polarization direction are polarized for utilizing is 90 ° and 45 °
Two analyzers analyzing is carried out respectively to two-way single order single sideband singal；
Photodetection output unit, for carrying out photodetection respectively to signal after two-way analyzing and removing gained electric signal
In DC component, obtain that a pair of amplitudes are identical, intermediate-freuqncy signal of quadrature in phase.
It is emphasized that in technical solution of the present invention, phase-modulator and light polarization modulator in modulating unit are cascaded
Context can arbitrarily adjust.Can be defeated by local oscillation signal by the rf inputs of radiofrequency signal input phase modulator
Enter the rf inputs of polarization device processed,；It can also will be penetrated conversely, by the rf inputs of local oscillation signal input phase modulator
The rf inputs of frequency signal input polarization device.As long as between ensureing two perpendicular polarisation state modulated signals in institute's output signal
Phase difference be 90 °, therefore the program has very high flexibility.
In order to improve signal intensity, signal amplification can be carried out before or after single order single sideband singal is extracted.In order to
Simplify structure and avoid phase or amplitude mismatch problem, preferably two-way cascade modulated signal uses same erbium-doped fiber amplifier
Combined with optical band pass filter to build amplification and single-side belt extraction unit.
It is below with a preferred embodiment of the orthogonal mixer device of the present invention and next with reference to accompanying drawing for the ease of public understanding
Technical scheme is described in detail：
Fig. 1 shows the basic structure of orthogonal mixer device in the present embodiment.As shown in figure 1, the device includes：Laser
Device, phase-modulator, light polarization modulator, erbium-doped fiber amplifier, optical band pass filter, beam splitter, analyzer 1, analyzer 2,
Photodetector 1, photodetector 2, block isolating device 1, block isolating device 2.As shown in figure 1, laser output connects phase-modulator
Light carrier input；Phase-modulator, light polarization modulator, erbium-doped fiber amplifier, optical band pass filter, beam splitter level successively
Connection；One output end of beam splitter is sequentially connected analyzer 1, photodetector 1, block isolating device 1, branch road in composition；Beam splitter
Another output end is sequentially connected analyzer 2, photodetector 2, block isolating device 2, forms lower branch road.
Radiofrequency signal and local oscillation signal are loaded into the rf inputs of phase-modulator and light polarization modulator respectively, passed through
The direct current biasing of light polarization modulator is adjusted, it is operated in quadrature bias state, so as to realize microwave photon down conversion function；Partially
The optical signal of the modulator that shakes output amplifies by erbium-doped fiber amplifier and selects+1 or -1 rank sideband by optical band pass filter；
Then, the optical signal of device after filtering is divided into two branch roads of identical by beam splitter；Two paths of signals successively passes through inspection
Inclined device, photodetector and block isolating device, unlike two-way analyzer be polarized direction and light polarization modulator main shaft polarization direction
Angle；Wherein；It is 90 degree that analyzer on one branch road, which is polarized direction and the angle of light polarization modulator main shaft polarization direction,；It is another
It is 45 degree that analyzer on bar branch road, which is polarized direction and the angle of light polarization modulator main shaft polarization direction,；Finally, two paths of signals point
Not Jing Guo photodetector complete optical-electronic conversion and by block isolating device remove DC component, can be identical to obtain a pair of amplitudes,
The intermediate-freuqncy signal of quadrature in phase, that is, realize the function of orthogonal mixing.
If the continuous light wave of laser output is
Ec(t)=E0cos(ωct). (1)
Wherein E0For light wave amplitude, ωcFor light wave center angular frequency.
In the phase-modulator of radiofrequency signal is loaded with, the phase of laser is by rf-signal modulation.Phase-modulator
Export and be
E1(t)=E0cos[ωct+β1cos(ωRt)]. (2)
Wherein β1For phase-modulator phase modulation coefficient, ωRFor radiofrequency signal angular frequency.
Secondary modulation is carried out in the light polarization modulator for be loaded with local oscillation signal by the signal of phase-modulation.Polarization Modulation
The output of device is expressed as
Wherein β2For the phase modulation coefficient of light polarization modulator, ωLFor local oscillation signal angular frequency,For two vertical polarizations
Phase difference between state modulated signal, its size can be changed by adjusting the direct current biasing of light polarization modulator.
In the present invention,Value be set to 90 degree.
Then, the signal by light polarization modulator secondary modulation is amplified by erbium-doped fiber amplifier, by the logical filter of light belt
Ripple device selects+1 or -1 rank sideband.By taking -1 rank sideband as an example, the output of optical band pass filter is
Wherein Jn() represents first kind n rank Bessel functions.
Two branch roads of identical are divided into by beam splitter by the signal of optical band pass filter, every branch road all has analyzing
Device.It is α that if analyzer, which is polarized direction and the angle of light polarization modulator main shaft polarization direction,.Without loss of generality, the output of analyzer
For：
E2(t)∝cosα·Ex1+sinα·Ey1. (5)
In upper branch road, the be polarized direction and the angle of light polarization modulator main shaft polarization direction of analyzer 1 are 90 degree.
Now, light polarization modulator is accomplished that the function of phase-modulation, and the output of analyzer 1 is：
E3(t)∝J0(β1)J1(β2)sin[(ωc-ωL)t]-J0(β2)J1(β1)sin[(ωc-ωR)t]. (6)
In lower branch road so that the be polarized direction and the angle of light polarization modulator main shaft polarization direction of analyzer 2 are 45 degree.This
When, light polarization modulator is accomplished that the function of mach zhender intensity modulated, and the output of analyzer 2 is：
E4(t)∝J0(β1)J1(β2)cos[(ωc-ωL)t-π/4]+J0(β2)J1(β1)cos[(ωc-ωR)t+π/4].
(7)
Finally, the output optical signal of analyzer 1 and analyzer 2 is changed into by photodetector 1 and photodetector 2 respectively
Electric signal, and the DC component in the electric signal as obtained by removing block isolating device 1 and block isolating device 2 respectively, obtained upper branch road output
For：
vI(t)∝J0(β1)J1(β2)J0(β2)J1(β1)cos[(ωR-ωL)t]. (8)
Lower branch road exports：
vQ(t)∝J0(β1)J1(β2)J0(β2)J1(β1)sin[(ωR-ωL)t]. (9)
Intermediate-freuqncy signal shown in comparison expression (8) and formula (9), it can be seen that both phases differ 90 degree, and amplitude is identical, illustrate this
Invention can realize orthogonal mixing.
In order to illustrate the validity of technical solution of the present invention, the present invention is tested.Device parameters used in experiment are such as
Under：
Laser (TeraXion, PS-NLL-1550.12-040-000-A1) output light-wave wavelength is 1550.12nm, defeated
It is 16dBm to go out power；Phase-modulator (EOSPACE, PM-DV5-40-PFA-PFA-LV) bandwidth of operation is 40GHz；Polarization is adjusted
Device (Versawave, PL-40G-3-1550-V-FCP-FCU) bandwidth of operation processed is 40GHz；Model selected by erbium-doped fiber amplifier
For：Amonics,AEDFA-35-B-FA；Model selected by optical band pass filter：Yenista,XTM-50/S；Photodetector
The bandwidth of operation of (Discovery Semiconductors, DSC50S) is 12GHz, responsiveness 0.80A/W；Radio-frequency signal source
For Agilent, E8257D-option 567；Local oscillation signal source is Agilent, E8257D-option 540.
Radio-frequency signal source output microwave signal frequency is set to 25.1GHz first, power is set to 6dBm；Local oscillation signal source is defeated
Go out microwave signal frequency and be set to 25GHz, power is set to 10dBm.Fig. 2 is shown with real-time oscilloscope (Keysight, DSO-X
100-MHZ intermediate-freuqncy signals 92504A) measured.It can be seen that both amplitudes are equal, quadrature in phase, illustrate that the present invention can be effective
Realize orthogonal mixing.
Then the microwave signal frequency that radio-frequency signal source exports is increased successively since 5GHz according to 2.5-GHz step-length
To 40GHz.Correspondingly, output microwave signal frequency in local oscillation signal source remains smaller 0.1GHz than radio frequency signal frequency.Fig. 3 institutes
It is shown as the relation curve of intermediate-freuqncy signal power, phase mismatch size and rf frequency.As can be seen that in 10 frequencies for arriving 40GHz
In the range of, phase mismatch is less than 1 degree, amplitude imbalance maximum 1.02dB.So orthogonal mixer device of the present invention has
Big bandwidth characteristic.
Claims (10)
1. the orthogonal frequency mixing method of microwave photon based on cascade phase and light polarization modulator, it is characterised in that utilize the phase of cascade
Radiofrequency signal and intrinsic signals are modulated on light carrier by position modulator and light polarization modulator respectively, and generation two of which is vertically inclined
The cascade modulated signal that phase difference between polarization state modulated signal is 90 °；The single order for extracting the cascade modulated signal unilateral is taken a message
Number and be classified as two-way；Then it is 90 ° and 45 ° using the angle of direction and the light polarization modulator main shaft polarization direction is polarized
Two analyzers analyzing is carried out respectively to two-way single order single sideband singal；Photoelectricity is finally carried out respectively to signal after two-way analyzing
Detect and remove the DC component in gained electric signal, obtain that a pair of amplitudes are identical, intermediate-freuqncy signal of quadrature in phase.
2. method as claimed in claim 1, it is characterised in that also include carrying out cascade modulated signal or single order single sideband singal
The step of signal amplifies.
3. method as claimed in claim 2, it is characterised in that carry out signal amplification using erbium-doped fiber amplifier.
4. method as claimed in claim 1, it is characterised in that utilize the one of the light pass filter extraction cascade modulated signal
Rank single sideband singal.
5. method as claimed in claim 1, it is characterised in that remove the DC component in electric signal using block isolating device.
6. the orthogonal mixer device of microwave photon based on cascade phase and light polarization modulator, it is characterised in that including：
Modulating unit is cascaded, it includes the phase-modulator and light polarization modulator cascaded, for by radiofrequency signal and intrinsic signals
It is modulated to respectively on light carrier, generates the cascade modulation letter that the phase difference between two of which perpendicular polarisation state modulated signal is 90 °
Number；
Single-side belt extraction unit, for extracting the single order single sideband singal of the cascade modulated signal and being classified as two-way；
Analyzing unit, the angle that direction and the light polarization modulator main shaft polarization direction are polarized for utilizing is the two of 90 ° and 45 °
Individual analyzer carries out analyzing respectively to two-way single order single sideband singal；
Photodetection output unit, for carrying out photodetection respectively to signal after two-way analyzing and removing in gained electric signal
DC component, obtains that a pair of amplitudes are identical, intermediate-freuqncy signal of quadrature in phase.
7. device as claimed in claim 6, it is characterised in that the single-side belt extraction unit also includes amplifier, for level
Join modulated signal or single order single sideband singal carries out signal amplification.
8. device as claimed in claim 7, it is characterised in that the amplifier is erbium-doped fiber amplifier.
9. device as claimed in claim 6, it is characterised in that the single-side belt extraction unit utilizes light pass filter extraction institute
State the single order single sideband singal of cascade modulated signal.
10. device as claimed in claim 6, it is characterised in that the photodetection output unit utilizes to be removed using block isolating device
DC component in electric signal.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108880648A (en) * | 2018-07-06 | 2018-11-23 | 西安电子科技大学 | Ultra-broadband signal frequency estimating methods based on microwave photon array |
| CN109802729A (en) * | 2019-01-07 | 2019-05-24 | 中国科学院上海光学精密机械研究所 | The coherent reception system of amplitude-phase cascade modulation in laser communication |
| CN109981181A (en) * | 2019-02-19 | 2019-07-05 | 西北工业大学 | Microwave photon converter plant and adjusting method can be switched in a kind of binary channels |
| CN110166134A (en) * | 2019-05-07 | 2019-08-23 | 中国电子科技集团公司第三十八研究所 | Light inphase-quadrature modem system, the digital integrated radio frequency system based on the system |
| CN114448518A (en) * | 2020-11-04 | 2022-05-06 | 西安电子科技大学 | Method for detecting optical carrier radio frequency link with low complexity coherence |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108880648A (en) * | 2018-07-06 | 2018-11-23 | 西安电子科技大学 | Ultra-broadband signal frequency estimating methods based on microwave photon array |
| CN108880648B (en) * | 2018-07-06 | 2021-04-06 | 西安电子科技大学 | Ultra-wideband signal frequency estimation method based on microwave photonic array |
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| CN110166134A (en) * | 2019-05-07 | 2019-08-23 | 中国电子科技集团公司第三十八研究所 | Light inphase-quadrature modem system, the digital integrated radio frequency system based on the system |
| CN110166134B (en) * | 2019-05-07 | 2020-09-25 | 中国电子科技集团公司第三十八研究所 | Optical quadrature modulation-demodulation system and digital comprehensive radio frequency system based on same |
| CN114448518A (en) * | 2020-11-04 | 2022-05-06 | 西安电子科技大学 | Method for detecting optical carrier radio frequency link with low complexity coherence |
| CN114448518B (en) * | 2020-11-04 | 2024-01-30 | 西安电子科技大学 | Method for coherently detecting optical carrier radio frequency link with low complexity |
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