CN102882553A - Method for regulating and generating various phase pulses in photonic microwave signal generator - Google Patents

Method for regulating and generating various phase pulses in photonic microwave signal generator Download PDF

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Publication number
CN102882553A
CN102882553A CN2012103321503A CN201210332150A CN102882553A CN 102882553 A CN102882553 A CN 102882553A CN 2012103321503 A CN2012103321503 A CN 2012103321503A CN 201210332150 A CN201210332150 A CN 201210332150A CN 102882553 A CN102882553 A CN 102882553A
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China
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microwave signal
signal generator
pulse
regulating
bragg grating
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CN2012103321503A
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Chinese (zh)
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CN102882553B (en
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姜恒云
闫连山
叶佳
孙亚飞
陈智宇
潘炜
罗斌
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西南交通大学
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Abstract

The invention discloses a method for regulating and generating various phase pulses in a photonic microwave signal generator. A microwave signal generator is formed by a broadband light source (100), a light intensity modulator (101), an electric pulse generator (102), a fiber Bragg grating string (103), an adjustable band pass filter (104), an optical amplifier (105), dispersive medium (106) and a photoelectric converter (107); a tunable spectrum structure unit (108) is formed by the fiber Bragg grating (FBG) string (103) and the adjustable band pass filter (104); and on the basis of the above-mentioned structure, the spectrum structure is scrambled and overlapped in shape to different extents in the dispersive medium (106) so as to generate the pulses in different shapes. The method disclosed by the invention has the advantages of simple structure and good tenability, and can be applied to a plurality of important fields such as microwave antenna, military radars, sensor networks and the like.

Description

A kind of method that produces the various shape pulse of in the photon microwave signal generator, regulating
Technical field
The present invention relates to the optical communication field, especially utilize the photon method to produce the technology of microwave signal, be applicable to produce the microwave signal of different envelope shapes tunablely.
Background technology
Along with the development of microwave communication technology, the microwave signal generation is widely applied, in microwave antenna, military radar and different sensing network.At present, what the generator of microwave signal mainly adopted is the microwave circuit technology, but along with people to the active demand of large capacity, ultra broadband high-speed communication and further developing of China's Internet of Things engineering, the signal generation rate of existing microwave signal generator and tunability etc. are had higher requirement.For this reason, the method that a kind of technology by photon produces microwave signal has been proposed in recent years, i.e. microwave photon signal generation technique.This technology has little, lightweight, the advantages such as tunability is strong, anti-electromagnetic interference of volume.Simultaneously, the technology of light frequency domain to time domain mapping, namely the optical Fourier transform technology is a common technique in the microwave photon signal generator, the light signal that this technology is based on different frequency has in dispersive medium that the phenomenon of different transmission speeds realizes.
Technology based on the mapping of light frequency domain to time domain realizes that the scheme that the tunable microwave photon signal occurs mainly contains following several at present: (1) is based on the moulding technology of spatial light modulation, construct the spectrum of required form by different spatial light modulation technology, the microwave signal that then then can obtain required form by feat of mapping and the opto-electronic conversion of frequency domain to time domain, the tunability of this scheme is strong, but the structure of spatial light modulation device is large, expensive; (2) based on the moulding technology of the spectrum of full optical fiber, subsequently moulding or carry out simultaneously the mapping of light frequency domain to time domain by the tunable optic filter of all optical fibre structure, then can be obtained again the microwave signal of respective shapes by opto-electronic conversion.By this kind scheme, realized at present the generation of sinusoidal signal, triangle signal, ultra-broadband signal by different spectral structure devices, but failed to realize to produce in the single device sinusoidal signal, triangle signal, ultra-broadband signal tunablely; (3) compose scheme moulding and the 2nd order chromatic dispersion medium based on full optical fiber optical optical, this scheme is a kind of expansion of scheme two, and the mapping of carrying out nonlinear frequency domain to time domain by the dispersion of second order then can make generation be with the microwave signal of warbling.
Above-mentioned three kinds of schemes all are to realize the generation of adjustable microwave signal by the microwave photon technology, wherein the tunability of scheme one is good, but the moulding complexity of spectrum, scheme two, three has proposed the different spectrum shaping technology based on full optical fiber, but can not realize the generation of any microwave signal of single module, very flexible has restricted the development in microwave communication field.
Summary of the invention
In view of the above shortcoming of prior art, the purpose of this invention is to provide a kind of tunable microwave signal generator based on the microwave photon technology.
The objective of the invention is to propose and realize based on following analysis and scheme:
A kind of method that produces the various shape pulse of in the photon microwave signal generator, regulating, with wideband light source 100, light intensity modulator 101, electric pulse generator 102, Fiber Bragg Grating FBG string 103, variable band-pass filter 104, image intensifer 105, dispersive medium 106 and optical-electrical converter 107 consist of microwave signal generator, wherein Fiber Bragg Grating FBG (FBG) string 103 and variable band-pass filter 104 consist of tunable spectral structure unit 108, on basic platform as above, in dispersive medium (106), produce difform pulse through the stack of crosstalking in various degree by the shape to spectral structure.
Wideband light source has wider and smooth spectrum, continuous light signal is cut to the gaussian signal at interval by light intensity modulator, then obtain the transmitted spectrum of optical fiber string by the Fiber Bragg Grating FBG in the spectral structure unit 108 (FBG) string 103, then selected by tunable bandpass filters, consist of different " code element shape ".In the Linear dispersive medium 106 of specific dispersion measure, then can realize having the necessarily mapping of the frequency domain to time domain of degree of crosstalking.By reasonably controlling code element shape and degree of crosstalking, the stack of can crosstalking, mapping produce the light signal of different envelope shapes.At last, after opto-electronic conversion at a high speed, then can produce the microwave signal of different envelope shapes.Wherein, the control of degree of crosstalking can realize by following dual mode: 1) regulate the dispersion measure size; 2) modulation signal code check or the pattern of adjusting strength modulator.The adjusting of dispersion measure can affect the rear pulse duration that produces signal of mapping, and the adjusting of modulation signal can affect the rear code check that produces signal of mapping.
Adopt the present invention than general microwave circuit technology, what the present invention adopted is the microwave photon technology, be suitable at a high speed, spectral range is in the generation of any microwave signal of 1~50GHz, has lightweight, the characteristics such as size is little, tunability is large, anti-electromagnetic interference.With compare based on the tunable microwave signal generator of microwave photon technology, wherein can adopt the moulding mode that combines with the frequency domain to time domain mapping techniques of spectrum to produce microwave signal, but the shape of the microwave signal of its generation only depends on the spectral structure technology.But the microwave signal pulse shape control method that the present invention proposes can be simplified the complexity that spectrum is moulded on the one hand, shines upon to enrich the envelope shape of the microwave signal that the present invention produces by introducing the frequency domain to time domain of necessarily crosstalking.Flexibility of the present invention is high, and function is many, and is simple to operate, can be applicable to a plurality of important aspects such as microwave antenna, radar and sensing network.
Description of drawings:
Fig. 1 is based on the basic platform schematic diagram of the tunable microwave signal generator of microwave photon technology among the present invention;
Fig. 2 is the schematic diagram of tunable microwave signal generator of the present invention, and wherein (a) is the moulding process of spectrum; (b) be the principle of common frequency domain to time domain mapping techniques; The principle of the frequency domain to time domain mapping of (c) crosstalking for introducing of the present invention;
Fig. 3 is the schematic diagram of the moulding unit of a kind of typical tunable spectrum in the basic platform of the present invention;
Fig. 4 is the method schematic diagram of regulating the cyclic pulse signal that produces various shape among the present invention;
Fig. 5 is the method schematic diagram of regulating the acyclic pulse signal that produces various shape among the present invention;
Fig. 6 is emulation and the experimental result picture by the ultra-wideband microwave signal of the single order of the 5Gb/s positive polarity of the present invention's generation;
Fig. 7 is emulation and the experimental result picture by the ultra-wideband microwave signal of the single order of the 5Gb/s negative polarity of the present invention's generation;
Fig. 8 is emulation and the experimental result picture by the microwave signal of the 10Gb/s triangular form of the present invention's generation;
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
As shown in Figure 1, basic platform of the present invention is made of wideband light source 100, light intensity modulator 101, electric pulse generator 102, optical fiber bragg grating FBG string 103, variable band-pass filter 104, image intensifer 105, dispersive medium 106 and optical-electrical converter 107.Wherein, Fiber Bragg Grating FBG (FBG) string 103 and variable band-pass filter 104 have consisted of tunable spectral structure unit 108.
Fig. 2 is the schematic diagram of tunable microwave signal generator of the present invention.Shown in figure (a), light intensity modulator 101 is modulated the light that broadband continuous light source 100 produces under the control of electric pulse generator 102, has generated the optical pulse train that is interrupted in time.Then, to carry out spectrum by tunable spectral structure unit 108 moulding for the light signal after the modulation.Figure (b) is the principle of common frequency domain to time domain mapping, because the speed that the light of different frequency component is propagated in dispersive medium is different, introduce certain dispersion measure by Linear dispersive medium 106, if theoretical according to the Cittert-Zernike of time domain---when transmitting in monomode fiber (Linear dispersive medium), satisfies light The time, Φ wherein 2Be group velocity time delay (GDD) value of dispersive medium, σ 0Be the width of input optical pulse, then can realize the mapping of light frequency domain to time domain.In the process of frequency domain to time domain mapping, the pulse that each light intensity modulation produces will be shone upon correspondingly and be produced a time domain waveform consistent with spectral shape.Because the introducing of large chromatic dispersion quantity, the broadband of the time domain waveform of generation (Δ T) will be much larger than the pulse duration after the modulation.At this moment, if will introduce intersymbol interference between the time domain waveform after the time interval (1/B) of the adjacent pulse after the modulation less than the broadband (Δ T) of the time domain waveform after shining upon, then shines upon this moment, shown in figure (c).The present invention passes through the mapping of the frequency domain to time domain of an amount of intersymbol interference of introducing just, by the moulding more light pulse signal of complicated shape that constructs of simple spectrum.At last, then can obtain the microwave signal of respective shapes by opto-electronic conversion.
Fig. 3 is tunable spectrum structural unit of the present invention, bragg grating cascade by several different centre wavelengths, bandwidth and reflectivity consists of one " code element module library ", then carrying out spectrum by a bandwidth and the tunable band pass filter of centre wavelength in this module library selects, then can obtain by the adjusting to band pass filter multiple spectrum shape, i.e. code element shape.
Fig. 4 is the method for regulating the cyclic pulse signal that produces various shape among the present invention.When fixing dispersion measure, by changing the time interval (1/B) of recurrent pulse after the modulation, introduce an amount of intersymbol interference.Pulse interval (1/B) increases, and then degree of crosstalking reduces, and pulse interval (1/B) reduces, and then degree of crosstalking increases.When the fixed modulation electric pulse, also can increase degree of crosstalking by the size that increases dispersion measure.At this moment, because the electric pulse of modulation is periodic, the synthetic signal of then crosstalking is also for periodic.
Fig. 5 is the method for regulating the aperiodicity pulse that produces various shape among the present invention.Therefore by adopting aperiodic electric pulse to come modulated light signal, so that the interval is unequal between code element, then can introduce the aperiodicity signal that in various degree intersymbol interference produces various shape according to above-mentioned identical mode.
According to above-mentioned principle, we have made up the feasibility that a basic platform based on the tunable microwave signal generator of microwave photon technology is verified the inventive method, have below provided part model experiment result.Wherein, wideband light source adopts is to be excited spontaneous radiation light source ASE.
The spectral shape that Fig. 6 (a) produces for the spectral structure unit, adopt pattern to modulate for the 10Gb/s electric pulse of " 010101 ", figure (b) is the photooscillogram of the ultra-broadband signal shape of the single order of the 5Gb/s positive polarity of generation in the experiment, and wherein illustration is corresponding intersymbol interference situation in the emulation.
Fig. 7 (a) is the 10Gb/s modulation of " 010101 " for the spectral shape that the spectral structure unit produces by pattern, and figure (b) is the photooscillogram of the ultra-broadband signal shape of the single order of the 5Gb/s positive polarity of generation in the experiment.Wherein illustration is corresponding intersymbol interference situation in the emulation.
Fig. 8 (a) is the spectral shape of spectral structure unit structure, and pattern is modulated for the 10Gb/s signal of telecommunication of " 010101 ", the 10Gb/ triangular form photooscillogram of figure (b) for producing in the experiment.Wherein illustration is corresponding intersymbol interference situation in the emulation.

Claims (4)

1. in the photon microwave signal generator, regulate the method that realizes producing the various shape pulse for one kind, with wideband light source (100), light intensity modulator (101), electric pulse generator (102), Fiber Bragg Grating FBG string (103), variable band-pass filter (104), image intensifer (105), dispersive medium (106) and optical-electrical converter (107) consist of microwave signal generator, wherein Fiber Bragg Grating FBG (FBG) string (103) and variable band-pass filter (104) consist of tunable spectral structure unit (108), on basic platform as above, in dispersive medium (106), produce difform pulse through the stack of crosstalking in various degree by the shape to spectral structure.
2. described a kind of method that produces the various shape pulse of in the photon microwave signal generator, regulating according to claim 1, it is characterized in that, described wideband light source is the continuous light source with relative spectral width, can be mode-locked laser, is excited spontaneous radiation light source ASE.
3. described a kind of method that produces the various shape pulse of in the photon microwave signal generator, regulating according to claim 1, it is characterized in that, Fiber Bragg Grating FBG can be the band resistance type filter of any specification in the described spectral structure unit, and can carry out any a plurality of Fiber Bragg Grating FBG and freely distribute.
4. described a kind of method that produces the various shape pulse of regulating in the photon microwave signal generator according to claim 1 is characterized in that described dispersive medium can be linearity or the Nonlinear Dispersive medium that comprises variety classes optical fiber, grating.
CN201210332150.3A 2012-09-10 2012-09-10 Method for regulating and generating various phase pulses in photonic microwave signal generator CN102882553B (en)

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Cited By (5)

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Publication number Priority date Publication date Assignee Title
CN103269011A (en) * 2013-05-28 2013-08-28 山东海富光子科技股份有限公司 High-energy pulse type full-fiber ASE source
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
CN103944591A (en) * 2014-05-13 2014-07-23 北京邮电大学 Optical-assistance-based pseudo millimeter wave ultra-broadband signal envelope detecting system and method
CN104734783A (en) * 2015-04-13 2015-06-24 天津理工大学 Arbitrary waveform light pulse generator
WO2018170824A1 (en) * 2017-03-23 2018-09-27 The University Of Hong Kong Real-time optical spectro-temporal analyzer and method

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CN101478068A (en) * 2009-01-22 2009-07-08 上海交通大学 Microwave signal phase shifting method based on polarized light interference technique
CN101902278A (en) * 2010-07-14 2010-12-01 西南交通大学 Microwave signal generation scheme capable of adjusting frequency and pulse width
CN102322888A (en) * 2011-08-30 2012-01-18 杭州布里特威光电技术有限公司 High-precision optical fiber grating sensing detection structure based on radio frequency optical modulation
CN102368582A (en) * 2011-09-22 2012-03-07 浙江大学 Laser wavelength adjustment-based opto-electronic oscillator with tunable frequency and broadband

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101478068A (en) * 2009-01-22 2009-07-08 上海交通大学 Microwave signal phase shifting method based on polarized light interference technique
CN101902278A (en) * 2010-07-14 2010-12-01 西南交通大学 Microwave signal generation scheme capable of adjusting frequency and pulse width
CN102322888A (en) * 2011-08-30 2012-01-18 杭州布里特威光电技术有限公司 High-precision optical fiber grating sensing detection structure based on radio frequency optical modulation
CN102368582A (en) * 2011-09-22 2012-03-07 浙江大学 Laser wavelength adjustment-based opto-electronic oscillator with tunable frequency and broadband

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103269011A (en) * 2013-05-28 2013-08-28 山东海富光子科技股份有限公司 High-energy pulse type full-fiber ASE source
CN103269011B (en) * 2013-05-28 2018-07-27 山东海富光子科技股份有限公司 High-energy pulse type full-fiber ASE source
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
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
CN103944591A (en) * 2014-05-13 2014-07-23 北京邮电大学 Optical-assistance-based pseudo millimeter wave ultra-broadband signal envelope detecting system and method
CN103944591B (en) * 2014-05-13 2016-03-30 北京邮电大学 The pseudo-millimeter wave ultra-wideband signal envelope detection system auxiliary based on optics and method
CN104734783A (en) * 2015-04-13 2015-06-24 天津理工大学 Arbitrary waveform light pulse generator
CN104734783B (en) * 2015-04-13 2017-08-15 天津理工大学 A kind of random waveform optical pulse generator
WO2018170824A1 (en) * 2017-03-23 2018-09-27 The University Of Hong Kong Real-time optical spectro-temporal analyzer and method

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