CN103117811A - Microwave phase modulator based on photon technology - Google Patents
Microwave phase modulator based on photon technology Download PDFInfo
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- CN103117811A CN103117811A CN2013100307585A CN201310030758A CN103117811A CN 103117811 A CN103117811 A CN 103117811A CN 2013100307585 A CN2013100307585 A CN 2013100307585A CN 201310030758 A CN201310030758 A CN 201310030758A CN 103117811 A CN103117811 A CN 103117811A
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Abstract
The invention discloses a microwave phase modulator based on photon technology. The microwave phase modulator is of a single-path double-channel structure comprising a light source 100, a Mach-Zehnder light modulator 101, a light circulator 102, an optic Bragg grating 103, a photophase modulator 104, a light reflecting mirror 105 and a photoelectricity detector 106. The Mach-Zehnder light modulator 101 realizes double sideband suppressed carrier modulation, a port 107 is a carrier frequency signal input port, a port 108 is a modulated signal port and a port 109 is a second-harmonic generation photon modulating signal output port. Range of signal-carrier frequency is determined by band width of the optic Bragg grating 103 and can be independently adjustable. The microwave phase modulator is simple in structure, high in stability and applicable to important aspects such as compression pulse technology of radio system and Code Division Multiple Access technology.
Description
Technical field
The present invention relates to the microwave device technical field, especially a kind of microwave signal phase modulator based on photon technology.Be applicable to solve two-forty, the independent adjustable microwave signal phase modulation of carrier frequency.
Background technology
In modern radar system, pulse compression technique has been widely used in improving the fields such as probing precision of radar.And pulse compression technique commonly used is to come compression phase modulation signal or chirp signal to realize at the radar receiving terminal by matched filter.Than the generation of the microwave phase modulation signal of electronic technology, the phase modulated signal that the microwave photon technology produces has higher time-bandwidth product, can further improve the compression ratio of pulse.
Microwave phase modulation device based on photon technology mainly contains following several scheme at present: 1) the beat frequency scheme of binary channel, this scheme is the light pulse signal beat frequency generation microwave phase modulation signal in photodetection by two out of phase information, the tunability of this scheme is good, but owing to being the binary channel structure, need to consider the problems such as power-balance, system stability; 2) and frequency moulding based on spectrum arrives the scheme of time domain conversion, this scheme is moulded the spectral shape of out of phase waveform by interference of light technology, then be mapped in time domain, this scheme waveform construction is accurate, but due to the moulding space devices that adopt of spectrum, volume is large, loss is many, aligning is comparatively complicated, not easy of integration etc. more.3) based on the scheme of microwave delay line filter, this scheme stability is strong, but the narrow bandwidth of filter will limit the bandwidth of the pulse signal that produces.
Above-mentioned three kinds of schemes all produce the microwave phase modulation signal by photon technology.Large, the complicated operation of the volume of scheme 2 wherein is for realizing single microwave signal phase modulation cost prohibitive and using inconvenient.For scheme 3, need to use the bandwidth of a plurality of tunable optical sources composition arrays and generation signal also restricted, the principle of scheme 1 is simple by contrast, tunability good, but because structural complexity makes it comparatively responsive to environment, these three kinds of schemes all can not realize the microwave signal phase modulation with more simple, stable structure, have restricted the development of pulse compression technique.
Summary of the invention
In view of the above shortcoming of prior art, the purpose of this invention is to provide a kind of microwave phase modulation device based on photon technology, make it to overcome the above deficiency of prior art.
The objective of the invention is propose and realize based on following analysis and scheme:
A kind of microwave phase modulation device based on photon technology, in comprising the phase-modulator that light source 100, Mach-Zehnder optical modulator 101, light annular device 102, Fiber Bragg Grating FBG 103, optical phase modulator 104, light reflection mirror 105, photodetector 106 consist of, Mach-Zehnder optical modulator 101 is biased in the minimum point of its transmission curve, has the input port 107 that is connected with CF signal; Optical phase modulator 104 has the port one 08 that is connected with input modulating signal; Photodetector 106 has the port one 09 that is connected with the output of two multiple frequency phase modulation signals; The frequency of carrier signal can separate tunable, but its tuning range is determined by the bandwidth of Fiber Bragg Grating FBG 103.
Be λ with centre wavelength
1Light signal to incide one be f by frequency
cThe Mach-Zehnder optical modulator that drives of sinusoidal microwave signal in, carry out the suppressed-carrier double side band modulation, generate two sidebands on ± 1 rank.Then incide (wavelength X in a specific flat Fiber Bragg Grating FBG via the light annular device
1Be positioned at the centre position of arbitrary rising edge of this fiber grating transmission spectrum, high reflectance, wide bandwidth), by this Fiber Bragg Grating FBG with in one of them sideband (+1 rank/-1 rank) reflected light annular device, another one sideband (1 rank /+1 rank) incides in optical phase modulator by this grating, and this sideband carries out phase-modulation by the digital microwave signal in optical phase modulator.Sideband after phase modulation (1 rank /+1 rank) is by the output of light reflection mirror reflected light phase-modulator, and is reverse by optical phase modulator, again combines at the input of Fiber Bragg Grating FBG and the sideband of non-modulated (+1 rank/-1 rank).Be input in photodetector by the light annular device, should produce 2f by ± 1 rank sideband beat frequency
cThe digital phase moudlation signal of carrier frequency.When light oppositely passed through optical phase modulator, due to the not cloth of speed, modulation efficiency was very low, can ignore the modulating action in this situation.When the carrier frequency frequency f
cDuring increase, the distance (2f between ± 1 rank sideband
c) increase, this moment is due to the limit bandwidth of Fiber Bragg Grating FBG, carrier frequency frequency f
cAdjustable range need bandwidth (GHz) less than Fiber Bragg Grating FBG.
Adopt the present invention than based on the binary channel of photon technology or the microwave phase modulation device of ring type structure, what the present invention adopted is the unipath channel structure, this structure does not need power-balance in the binary channel structure and structure more simple, stable, applicable to the resolution that improves radar system at the radar receiving terminal by compression pulse etc.
Description of drawings:
Fig. 1 is the structural representation of the microwave phase modulation device based on photon technology of the present invention;
Fig. 2 (a) is the principle schematic of microwave phase modulation device of the present invention; (b) be the frequency adjustment schematic diagram of CF signal in the present invention;
Fig. 3 is experimental result picture of the present invention, and wherein (a) is the spectrum of suppressed-carrier double side band signal; (b) be the transmission spectrum of the Fiber Bragg Grating FBG of application in experiment;
Fig. 4 is experimental spectrum figure of the present invention, and wherein (a) is-1 rank sideband by Fiber Bragg Grating FBG; (b) be to be reflected+1 rank sideband by Fiber Bragg Grating FBG; (c) be the sideband on synthetic ± 1 rank again before high-speed photodetector;
Fig. 5 is the experimental result picture of the present invention on oscilloscope, and wherein (a) is unmodulated 20GHz microwave signal; (b) be the microwave signal of the 20GHz after the modulation of 10Gbit/s non-return-to-zero signal;
Fig. 6 is the experimental result picture of the present invention on oscilloscope, and wherein (a) is unmodulated 22GHz microwave signal; (b) be the microwave signal of the 22GHz after the modulation of 11Gbit/s non-return-to-zero signal;
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
As shown in Figure 1, the present invention program is made of light source 100, Mach-Zehnder optical modulator 101, light annular device 102, Fiber Bragg Grating FBG 103, optical phase modulator 104, light reflection mirror 105, photodetector 106.Port one 07 is the input of CF signal, and port one 08 is the input of the digital signal of modulation, and port one 09 is the output of the phase modulated signal of two frequencys multiplication.
Fig. 2 (a) is principle schematic of the present invention, and wherein the Mach-Zehnder optical modulator is biased in the minimum output point of its transmission curve, realizes the suppressed-carrier double side band modulation.Light is through producing the sideband on ± 1 rank after this modulator, again through inciding in a specific bragg grating after the light annular device, the sideband on ± 1 rank is separated, and+1 sideband incides in an optical phase modulator by bragg grating, and-1 rank sideband is reflected back.Impact due to the rate-matched condition of light phase modulation, the modulation efficiency of forward transmission and reverse transfer far different (the high approximately 20dB of the modulation efficiency ratio inverse efficiency of transmission of forward transmission), therefore can think that light positive is to being input to phase-modulator, produce the effect of phase-modulation, and oppositely be input to phase-modulator, the effect that does not produce phase-modulation.According to above principle as can be known, + 1 rank sideband is through after the phase modulation of phase-modulator, be reflected back the delivery outlet of phase-modulator by light reflection mirror, oppositely transparent transmission is by phase-modulator and Fiber Bragg Grating FBG, again combine in Fiber Bragg Grating FBG input port and-1 rank sideband, be input in high-speed photodetector through annular device, because ± 1 rank sideband beat frequency produces two multiple frequency phase modulation signals.Figure (b) is carrier frequency Principles of Regulation figure of the present invention, wherein require the wavelength set of light source in the centre position of arbitrary rising edge of Fiber Bragg Grating FBG transmission spectrum, due to the carrier-suppressed double sideband modulation, two sidebands equidistantly are distributed in carrier wave both sides, the bandwidth of Fiber Bragg Grating FBG has determined the incoming frequency scope of port one 07 of the present invention, and the reference frequency output of port one 09 is for inputting the twice of CF signal scope.
According to above-mentioned principle, we have provided the part of test results based on the microwave phase modulation device of photon technology that is built by the present invention.In experiment, the centre wavelength of light source is about 1556.05nm, and the input signal of 107 ports is the sinusoidal signal of different frequency, and the input signal of 108 ports is the non-return-to-zero signal of the different code checks take " 100100100 " as code word.
Fig. 3 is experimental result picture of the present invention.Figure (a) is the transmission spectrum of the Fiber Bragg Grating FBG that records in experiment, and reflectivity is 99.9%, and full width at half maximum is about 0.3nm.Figure (b) is the spectrogram of the suppressed-carrier double side band signal of generation in experiment, and what loaded on Mach-Zehnder modulators this moment is the sinusoidal signal of 10GHz.
Fig. 4 is experimental spectrum figure of the present invention.-1 rank sideband that pass through Fiber Bragg Grating FBG of figure (a) for recording in experiment; Figure (b) is being reflected+1 rank sideband by Fiber Bragg Grating FBG of recording in experiment; Figure (c) in the input high-speed photodetector that records in experiment ± sideband on 1 rank, wherein-1 rank sideband is through phase-modulation and broadening.
Fig. 5 is experimental result of the present invention.The carrier frequency of 107 port inputs is 10GHz, and the code check of 108 port supplied with digital signal is 10Gbit/s, and figure (a) is the signal of unmodulated 20GHz, and figure (b) is the signal of the 20GHz of the phase-modulation of generation.
Fig. 6 is experimental result of the present invention.The carrier frequency of 107 port inputs is 11GHz, and the code check of 108 port supplied with digital signal is 11Gbit/s, and figure (a) is the signal of unmodulated 22GHz, and figure (b) is the signal of the 22GHz of the phase-modulation of generation.
By the two frequency-doubled signal phase-modulation functions that can observe the present invention in above experimental result and can realize carrier frequency frequency separate tunable.
When reality was implemented, Mach-Zehnder optical modulator 101 can be for producing arbitrarily the modulator block of carrier-suppressed double sideband effect; Fiber Bragg Grating FBG 103 can be for having arbitrarily the optical filter that separates the sideband effect; Optical phase modulator 104 can realize for quadrature amplitude IQ modulator the quadrature amplitude modulation of microwave signal.
Claims (5)
1. microwave phase modulation device based on photon technology, it is characterized in that, in comprising the phase-modulator that light source 100, Mach-Zehnder optical modulator (101), light annular device (102), Fiber Bragg Grating FBG (103), optical phase modulator (104), light reflection mirror (105), photodetector (106) consist of, Mach-Zehnder optical modulator (101) is biased in the minimum point of its transmission curve, has the input port (107) that is connected with CF signal; Optical phase modulator (104) has the port (108) that is connected with input modulating signal; Photodetector (106) has the port (109) that is connected with the output of two multiple frequency phase modulation signals; But the frequency independent tuning of carrier signal, but its tuning range is by the bandwidth decision of Fiber Bragg Grating FBG (103).
2. according to claim 1 the microwave phase modulation device based on photon technology, is characterized in that, described Mach-Zehnder optical modulator (101) can be module or the two relevant optical wavelength that produce arbitrarily the carrier-suppressed double sideband effect.
3. according to claim 1 the microwave phase modulation device based on photon technology, is characterized in that, described Fiber Bragg Grating FBG (103) can be for having arbitrarily the optical filter that separates the sideband effect.
4. according to claim 1 the microwave phase modulation device based on photon technology, is characterized in that, described light reflection mirror (105) can be for having arbitrarily the module of reverberation function.
5. according to claim 1 the microwave phase modulation device based on photon technology, is characterized in that, described optical phase modulator (104) can realize for quadrature amplitude IQ modulator the quadrature amplitude modulation of microwave signal.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103516435A (en) * | 2013-09-22 | 2014-01-15 | 西南交通大学 | Chirp microwave pulse signal generation method and device based on electro-optic external modulation nonlinear effect |
| CN103532632A (en) * | 2013-09-22 | 2014-01-22 | 西南交通大学 | Tunable microwave pulse signal precise generation method and device by adopting polarization quadrature modulation |
| CN103888191A (en) * | 2014-03-19 | 2014-06-25 | 北京邮电大学 | Microwave photon down-conversion method based on bi-directional utilization of phase modulator |
| CN109186643A (en) * | 2018-06-21 | 2019-01-11 | 上海第二工业大学 | A kind of accurate sensor-based system and method for sensing based on reflection function resonance filter |
| CN111077519A (en) * | 2020-01-15 | 2020-04-28 | 中国人民解放军空军预警学院 | Microwave photon radar implementation method and system |
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| CN102075258A (en) * | 2011-01-18 | 2011-05-25 | 汉鼎信息科技股份有限公司 | Frequency response balancer by using light carrier Brillouin treatment |
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| CN102075258A (en) * | 2011-01-18 | 2011-05-25 | 汉鼎信息科技股份有限公司 | Frequency response balancer by using light carrier Brillouin treatment |
| CN102751644A (en) * | 2012-07-31 | 2012-10-24 | 西南交通大学 | Wideband continuously tunable photoelectric oscillator based on excited Brillouin scattering effect |
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| JIA YE 等: "Photonic Generation of Microwave phase-coded signals Based on Frequency to Time Conversion", 《IEEE PHOTONICS TECHNOLOGY LETTERS》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103516435A (en) * | 2013-09-22 | 2014-01-15 | 西南交通大学 | Chirp microwave pulse signal generation method and device based on electro-optic external modulation nonlinear effect |
| CN103532632A (en) * | 2013-09-22 | 2014-01-22 | 西南交通大学 | Tunable microwave pulse signal precise generation method and device by adopting polarization quadrature modulation |
| CN103516435B (en) * | 2013-09-22 | 2016-01-06 | 西南交通大学 | Based on chirp microwave pulse signal generation method and the device of electro-optic external modulation nonlinear effect |
| CN103532632B (en) * | 2013-09-22 | 2016-01-27 | 西南交通大学 | Polarized orthogonal modulation tunable microwave pulse signal accurately generates method and device |
| CN103888191A (en) * | 2014-03-19 | 2014-06-25 | 北京邮电大学 | Microwave photon down-conversion method based on bi-directional utilization of phase modulator |
| CN109186643A (en) * | 2018-06-21 | 2019-01-11 | 上海第二工业大学 | A kind of accurate sensor-based system and method for sensing based on reflection function resonance filter |
| CN109186643B (en) * | 2018-06-21 | 2021-10-29 | 上海第二工业大学 | Accurate sensing system and sensing method based on reflection function resonant filter |
| CN111077519A (en) * | 2020-01-15 | 2020-04-28 | 中国人民解放军空军预警学院 | Microwave photon radar implementation method and system |
| CN111077519B (en) * | 2020-01-15 | 2022-09-02 | 中国人民解放军空军预警学院 | Microwave photon radar implementation method and system |
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Effective date of registration: 20170628 Address after: 610031 Chengdu City, Sichuan Province, No. two North Ring Road, Southwest Jiao Tong University, Co-patentee after: Southwest Jiaotong University Patentee after: Yan Lianshan Address before: 610031 Chengdu City, Sichuan Province, No. two North Ring Road, Southwest Jiao Tong University, Patentee before: Southwest Jiaotong University |
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