CN103117811B - Based on the microwave phase modulation device of photon technology - Google Patents
Based on the microwave phase modulation device of photon technology Download PDFInfo
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- CN103117811B CN103117811B CN201310030758.5A CN201310030758A CN103117811B CN 103117811 B CN103117811 B CN 103117811B CN 201310030758 A CN201310030758 A CN 201310030758A CN 103117811 B CN103117811 B CN 103117811B
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Abstract
The invention discloses a kind of microwave phase modulation device based on photon technology.This phase-modulator forms the twin-channel structure in unipath by 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, wherein Mach-Zehnder optical modulator 101 realizes carrier-suppressed double sideband modulation, port one 07 is CF signal input, port one 08 is modulation signal input, and port one 09 is two multiple frequency phase modulation signal outputs.The frequency of carrier signal scope of this programme is determined and separate tunable by the bandwidth of Fiber Bragg Grating FBG 103, and its structure is simple, stability strong, can be applicable in the compression pulse technology of radar system, the importance such as CDMA (Code Division Multiple Access).
Description
Technical field
The present invention relates to microwave device technology field, especially a kind of microwave signal phase modulator based on photon technology.Be applicable to the microwave signal phase modulation solving two-forty, carrier frequency Independent adjustable.
Background technology
In modern radar system, pulse compression technique has been widely used in the fields such as the probing precision of raising radar.And conventional pulse compression technique carrys out compression phase modulation signal by matched filter or chirp signal realizes at radar receiving terminal.Compared to the generation of the microwave phase modulation signal of electronic technology, the phase modulated signal that microwave photon technology produces has higher time-bandwidth product, can improve the compression ratio of pulse further.
Microwave phase modulation device at present based on photon technology mainly contains following several scheme: 1) the beat frequency scheme of binary channel, the program produces microwave phase modulation signal by light pulse signal beat frequency in photodetection of two out of phase information, the tunability of the program is good, but owing to being binary channel structure, then need to consider the problem such as power-balance, system stability; 2) based on the moulding scheme changed to time domain with frequency of spectrum, the program moulds the spectral shape of out of phase waveform by Optical interference techniques, then be mapped in time domain, program waveform construction is accurate, but due to spectrum moulding many employing spaces device, then volume is large, loss is many, aligning is comparatively complicated, not easy of integration.3) based on the scheme of microwave delay line filter, program stability is strong, but the narrow bandwidth of filter is by the bandwidth of the pulse signal of restriction generation.
Above-mentioned three kinds of schemes all produce microwave phase modulation signal by photon technology.Wherein large, the complicated operation of the volume of scheme 2, for realizing single microwave signal phase modulation cost prohibitive and using inconvenient.For scheme 3, then need to use multiple tunable optical source to form array and to produce the bandwidth of 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 microwave signal phase modulation with more simple, stable structure, constrain the development of pulse compression technique.
Summary of the invention
In view of the above shortcoming of prior art, the object of this invention is to provide a kind of microwave phase modulation device based on photon technology, make it the above deficiency overcoming prior art.
The object of the invention is to analyze and scheme proposes and realization based on following:
A kind of microwave phase modulation device based on photon technology, in the phase-modulator comprising 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 formation, Mach-Zehnder optical modulator 101 is biased in the minimum point of its transmission curve, has the input port 107 be connected with CF signal; Optical phase modulator 104 has the port one 08 be connected with input modulating signal; Photodetector 106 has the port one 09 be 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 by centre wavelength
1light signal to incide one by frequency be f
cthe Mach-Zehnder optical modulator that drives of sinusoidal microwave signal in, carry out suppressed-carrier double side band modulation, generate two sidebands on ± 1 rank.Then (wavelength X in a specific flat Fiber Bragg Grating FBG is incided via 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 by one of them sideband (+1 rank, rank/-1) reflected light annular device, another one sideband (-1 rank, rank /+1) then passes through this grating incidence in optical phase modulator, and in optical phase modulator, this sideband carries out phase-modulation by digital microwave signal.Sideband (-1 rank, rank /+1) after phase modulation is by the output of light reflection mirror reflected light phase-modulator, reverse by optical phase modulator, be reunited at the input of Fiber Bragg Grating FBG and the sideband (+1 rank, rank/-1) of non-modulated.Be input in photodetector by light annular device, then should produce 2f by ± 1 rank sideband beat frequency
cthe digital phase moudlation signal of carrier frequency.When light is back through optical phase modulator, due to the not cloth of speed, modulation efficiency is very low, can ignore the modulating action in this situation.As carrier frequency f
cduring increase, the distance (2f between ± 1 rank sideband
c) increase, now because the bandwidth of Fiber Bragg Grating FBG limits, then carrier frequency f
cadjustable range need be less than the bandwidth (GHz) of Fiber Bragg Grating FBG.
Adopt the present invention compared to based on the binary channel of photon technology or the microwave phase modulation device of ring type structure, what the present invention adopted is unipath channel structure, this structure does not need the power-balance in binary channel structure and structure is more simple, stable, is applicable to and improves the resolution etc. of radar system at radar receiving terminal by compression pulse.
Accompanying drawing illustrates:
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 frequency adjustment schematic diagram that () is 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 () is 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)+1 rank sideband for being reflected by Fiber Bragg Grating FBG; (c) for again synthesize before high-speed photodetector ± sideband on 1 rank;
Fig. 5 is the experimental result picture of the present invention on oscilloscope, and wherein (a) is unmodulated 20GHz microwave signal; B () is the microwave signal of the 20GHz after 10Gbit/s non-return-to-zero signal madulation;
Fig. 6 is the experimental result picture of the present invention on oscilloscope, and wherein (a) is unmodulated 22GHz microwave signal; B () is the microwave signal of the 22GHz after 11Gbit/s non-return-to-zero signal madulation;
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, the present invention program is made up 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 Mach-Zehnder optical modulator is biased in the minimum output point of its transmission curve, realizes suppressed-carrier double side band modulation.Light produces the sideband on ± 1 rank after this modulator, incide after light annular device again in a specific bragg grating, 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.Due to the impact of the rate-matched condition of light phase modulation, the modulation efficiency of forward transmission and reverse transfer is far different (modulation efficiency of forward transmission is than reverse transfer efficiency height about 20dB), therefore can think that light forward is input to phase-modulator, produce the effect of phase-modulation, and be oppositely input to phase-modulator, do not produce the effect of phase-modulation.According to above principle, + 1 rank sideband is after the phase modulation of phase-modulator, the delivery outlet of phase-modulator is reflected back by light reflection mirror, reverse transparent transmission is by phase-modulator and Fiber Bragg Grating FBG, be reunited with-1 rank sideband in Fiber Bragg Grating FBG input port, 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 that the wavelength of light source is set in the centre position of arbitrary rising edge of Fiber Bragg Grating FBG transmission spectrum, due to carrier-suppressed double sideband modulation, two sidebands are equidistantly distributed in carrier wave both sides, then the bandwidth of Fiber Bragg Grating FBG determines the incoming frequency scope of port one 07 of the present invention, and the reference frequency output of port one 09 is then the twice of input CF signal scope.
According to above-mentioned principle, we illustrate the part of test results of the microwave phase modulation device based on photon technology 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 with the non-return-to-zero signal of " 100100100 " the different code checks that are code word.
Fig. 3 is experimental result picture of the present invention.Figure (a) is the transmission spectrum of the Fiber Bragg Grating FBG recorded in experiment, and reflectivity is 99.9%, and full width at half maximum is about 0.3nm.Figure (b) be the spectrogram of suppressed-carrier double side band signal of generation in experiment, and what now Mach-Zehnder modulators loads is the sinusoidal signal of 10GHz.
Fig. 4 is experimental spectrum figure of the present invention.Figure (a) is-1 rank sideband by Fiber Bragg Grating FBG recorded in experiment; Figure (b) is+1 rank sideband reflected by Fiber Bragg Grating FBG recorded in experiment; Figure (c) be in testing in the input high-speed photodetector that records ± sideband on 1 rank, wherein-1 rank sideband through phase-modulation 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, the signal that figure (a) is unmodulated 20GHz, and figure (b) is the signal of the 20GHz of the phase-modulation produced.
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, the signal that figure (a) is unmodulated 22GHz, and figure (b) is the signal of the 22GHz of the phase-modulation produced.
By the two frequency-doubled signal phase-modulation functions can observing the present invention in above experimental result and can realize carrier frequency separate tunable.
When reality is implemented, Mach-Zehnder optical modulator 101 can be the modulator block producing arbitrarily carrier-suppressed double sideband effect; Fiber Bragg Grating FBG 103 can for having arbitrarily the optical filter being separated sideband effect; Optical phase modulator 104 can realize the quadrature amplitude modulation of microwave signal for quadrature amplitude I/Q modulator.
Claims (5)
1. the microwave phase modulation device based on photon technology, it is characterized in that, described microwave phase modulation device is by 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) is formed, wherein 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) is linked in sequence, photodetector (106) connects light annular device (102), Mach-Zehnder optical modulator (101) is biased in the minimum point of its transmission curve, has the input port (107) be connected with CF signal, optical phase modulator (104) has the port (108) be connected with input modulating signal, photodetector (106) has the port (109) be connected with the output of two multiple frequency phase modulation signals, the frequency of carrier signal can independent tuning, but its tuning range is determined by the bandwidth of Fiber Bragg Grating FBG (103).
2. the microwave phase modulation device based on photon technology according to claim 1, is characterized in that, described Mach-Zehnder optical modulator (101) can be the module producing arbitrarily carrier-suppressed double sideband effect.
3. the microwave phase modulation device based on photon technology according to claim 1, is characterized in that, described Fiber Bragg Grating FBG (103) can for having arbitrarily the optical filter being separated sideband effect.
4. the microwave phase modulation device based on photon technology according to claim 1, is characterized in that, described light reflection mirror (105) can for having arbitrarily the module of reverberation function.
5. the microwave phase modulation device based on photon technology according to claim 1, is characterized in that, described optical phase modulator (104) can realize the quadrature amplitude modulation of microwave signal for quadrature amplitude I/Q modulator.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| 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 |
| 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 |
Citations (2)
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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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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| Photonic Generation of Microwave phase-coded signals Based on Frequency to Time Conversion;Jia Ye 等;《IEEE PHOTONICS TECHNOLOGY LETTERS》;20120901;第24卷(第17期);1527-1529 * |
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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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