CN103888192A - Photo-electricity generating device and method for wavelength division multiplexing broad band chirp signals - Google Patents
Photo-electricity generating device and method for wavelength division multiplexing broad band chirp signals Download PDFInfo
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Abstract
The invention discloses a photo-electricity generating device for wavelength division multiplexing broad band chirp signals. The photo-electricity generating device comprises a laser, an electro-optical modulator, a plurality of photoelectric converters, a light wavelength division multiplexer and a low-frequency broad band radio frequency signal source. The electro-optical modulator comprises a radio frequency signal inlet, a light inlet, a light outlet and a work point control interface. The low-frequency broad band radio frequency signal source, the laser and the light wavelength division multiplexer are connected with the electro-optical modulator respectively through the radio frequency signal inlet, the light inlet and the light outlet. The electro-optical modulator is connected with the photoelectric converters through the light wavelength division multiplexer. Radio frequency signals and a light source are generated through the low-frequency broad band radio frequency signal source and the laser respectively, modulated through the electro-optical modulator and processed through the light wavelength division multiplexer and the photoelectric converters respectively to form high-frequency electric signals to be emitted through an antenna array. The photo-electricity generating device is simple in structure, the size of the system is effectively reduced, and the processing efficiency of the system is improved.
Description
Technical field
The present invention relates to logical Optical Controlled Phased Array Antenna technical field, relate in particular to a kind of photoelectricity generation device and method thereof of wavelength division multiplexing wide-band LFM signal.
Background technology
In Optical Controlled Phased Array Antenna and microwave photon technical field, what time following the research of photoproduction microwave at present mainly concentrate on: 1, the generation of employing optical-electronic oscillator is low makes an uproar mutually, single-frequency point microwave signal (Wangzhe Li and Jianping Yao " A Wideband Frequency Tunable Optoelectronic Oscillator Incorporating a Tunable Microwave Photonic Filter Based on Phase-Modulation to Intensity-Modulation Conversion Using a Phase-Shifted Fiber Bragg Grating, " IEEE Trans.Microw.Theory Tech., vol.60, no.6, June.2012, pp.1735 – 1742.), 2, adopt the modes such as optical carrier suppression and the adjustment of modulator offset operation point to realize the frequency multiplication (Q.Chang of input microwave signal, et.al, " A24-GHz ultra-wideband over fiber system using photonic generation and frequency up-conversion, " IEEE.Photon.Technol.Lett., vol.20, no.19, Oct.2008, pp.1651-1653.), 3, utilize electric pulse external modulation electrooptic modulator to produce ultra-broadband signal (J.Yao, F.Zeng, and Q.Wang, " Photonic generation of ultrawideband signals, " J.Lightwave Technol.vol.25, no.11, Nov.2007, pp.3219-3235.), 4, two wavelength lasers produce the microwave signal of telecommunication (the Jhih-Min Wun of higher frequency by photo-beat frequency and Phase Lock Technique, et.al, " Photonic chirped radio-frequency generator with ultra-fast sweeping rate and ultra-wide sweeping range " Optics Express, Vol.21, No.9, May, 2013, pp.11475-11483., Jhih-Min Wun, et.al, " Photonic chirped radio-frequency generator with ultra-fast sweeping rate and ultra-wide sweeping range " Optics Express, Vol.21, No.9, May, 2013, pp.11475-11483.).
But produce for the linear FM signal light that is applied to detection radar, except the external modulation mode of the linear frequency modulation signal of telecommunication, there is not yet people's design, research.The researcher of Liang Suo university of Israel is at Optical Letters and Photonic Technology Letters(Ofir Klinger, et.al, " Long Microwave-Photonic Variable Delay of Linear Frequency Modulated Waveforms; " IEEE Photon.Technol.Lett., vol.24, No.3, Feb1,2012, pp.200 – 202; Lior Yaron, and Moshe Tur, " RF Nonlinearities in an Analog Optical Link and Their Effect on Radars Carrying Linear and Nonlinear Frequency Modulated Pulses; " J.Lightw.Technol., vol.30, no.22, Nov15,2012, pp.3475 – 3483.) etc. reported the research for the transmission performance of linear FM signal in influential periodical.But they adopt electric territory linear FM signal external modulation to light carrier.As for adopting external modulation method to realize the generation of wide-band LFM signal, not yet see report.
In Optical Controlled Phased Array Antenna, can adopt outside certain bandwidth linear frequency modulation signal to be loaded into realization transmission, feed on light carrier by external modulation mode.Although the method is simple, direct, has only utilized the advantage of light carrier on transmission broadband signal, does not make full use of the technical advantage of the large bandwidth of light carrier.And the impact that produces large bandwidth linear frequency modulation signal current collector part bandwidth on electric territory is very large, be difficult to realize the linear FM signal such as X-band, 1-2GHz bandwidth.
Therefore, be necessary to propose a kind of photoelectricity production method of wavelength division multiplexing wide-band LFM signal, thereby the light of realizing the linear FM signal in different multiplying and broadband produces and realizes radar and need wide-band microwave signal.
Summary of the invention
In order to overcome the defect of prior art, the present invention aim to provide a kind of simple in structure, system effectiveness is high, and can realize photoelectricity generation device and the production method thereof of wavelength division multiplexing wide-band LFM signal.
To achieve these goals, the invention provides a kind of photoelectricity generation device of wavelength division multiplexing wide-band LFM signal, this device comprises laser, electrooptic modulator, some optical-electrical converters, light wavelength division multiplexing and broad band low frequency radio-frequency signal source; Wherein, described electrooptic modulator comprises radiofrequency signal entrance, light entrance, light exit and working point control interface; Described broad band low frequency radio-frequency signal source is connected with described electrooptic modulator by described radiofrequency signal entrance, described laser is connected with described electrooptic modulator by described light entrance, described light wavelength division multiplexing is connected with described electrooptic modulator by described light exit, and described optical-electrical converter is connected with described light wavelength division multiplexing; The radiofrequency signal producing by described broad band low frequency radio-frequency signal source linear frequency modulation enters described electrooptic modulator by described radiofrequency signal entrance, the light source that described laser produces enters electrooptic modulator by described light entrance, the light source of modulating by described electrooptic modulator enters described wavelength division multiplexer by described light exit, changes and enter aerial array by described wavelength division multiplexer light source after treatment by described optical-electrical converter.
Preferably, between described broad band low frequency radio-frequency signal source and described electrooptic modulator, be provided with radio frequency amplifier.
Preferably, between described broad band low frequency radio-frequency signal source and described electrooptic modulator, be provided with image intensifer.
Preferably, between described optical-electrical converter and described broad band low frequency radio-frequency signal source, described laser and described wavelength division multiplexer, be connected by general single mode fiber respectively.
Preferably, described light wavelength division multiplexing is diaphragm type light wavelength division multiplexing or array waveguide grating formula wavelength division multiplexer.
Preferably, described laser is multiwavelength laser source, produces the light source of multiple wavelength by described multiwavelength laser source, and carries out rf modulations by described electrooptic modulator.
The present invention also proposes a kind of photoelectricity production method of wavelength division multiplexing wide-band linearity modulation signal, produces photosignal by the photoelectricity generation device of wavelength division multiplexing wide-band linearity modulation signal, comprises the steps:
Described broad band low frequency radio-frequency signal source is produced linear FM signal and is entered described electrooptic modulator by described radiofrequency signal entrance by external electrical technology;
Described laser produces multi wave length illuminating source and enters described electrooptic modulator by described light entrance;
Adjust the bias voltage of described electrooptic modulator and select the operating state of described electrooptic modulator, and linear FM signal is carried out to the light territory frequency spectrum operation of modulation signal, and produce light signal;
A wavelength division multiplexed light time delay network is exported and entered to described light signal by described light exit, realize the time delay of light signal, and the light signal through time delay enters described light wavelength division multiplexing, pass through again described optical-electrical converter, the radiofrequency signal that output center frequency and bandwidth double simultaneously, and enter aerial array.
Preferably, described broad band low frequency radio-frequency signal source and described laser respectively and between described electrooptic modulator, be provided with radio frequency amplifier and image intensifer, respectively by described radio frequency amplifier and described image intensifer compensation radio frequency loss.
Preferably, the wavelength of the light signal by described light wavelength division multiplexing is corresponding one by one with the wavelength of the light source that described laser produces, and the number of described optical-electrical converter is all identical with the number of active lanes of described light wavelength division multiplexing with the wavelength number of described laser generation.
Preferably, described electrooptic modulator, by selecting suitable bias voltage and the operating state of described electrooptic modulator, makes to export from described optical-electrical converter the signal of telecommunication obtaining described linear FM signal is carried out to frequency multiplication or carrier wave inhibition operation; And, select the offset operation point of described electrooptic modulator by the control of described working point control interface, make the bandwidth of exporting the signal of telecommunication obtaining from described optical-electrical converter be no more than the bandwidth of described light wavelength division multiplexing channel spacing.
Compared with prior art, beneficial effect of the present invention is as follows:
1, the photoelectricity generation device of wavelength division multiplexing wide-band LFM signal of the present invention is only by laser, electrooptic modulator, optical-electrical converter, light wavelength division multiplexing and broad band low frequency radio-frequency signal source composition, it is simple in structure, by utilizing the linear FM signal that realizes higher frequency band, higher bandwidth compared with the linear FM signal of low-frequency range, less bandwidth, do not need laser to carry out internal modulation processing, thereby effectively reduce the volume of system, improved the efficiency of system.
2, the photoelectricity production method of the wavelength division multiplexing wide-band LFM signal of the present invention's design, with in prior art, utilize two lasers and realize compared with the method for broadband frequency sweep radiofrequency signal, this photoelectricity generation device utilizes electrooptic modulator working point and input radio frequency signal amplitude the operating characteristic of frequency spectrum to be realized to the generation of frequency electromagnetic waves, and without two lasers being carried out to phase place locking processing, there is the frequency stability of better practicality and Geng Gao.
3, the photoelectricity generation device of wavelength division multiplexing wide-band LFM signal of the present invention has good autgmentability, can implement according to actual needs series connection, thereby can meet the needs that more high band, larger wide-band LFM signal photoelectricity produce.
4, the photoelectricity generation device of wavelength division multiplexing wide-band LFM signal of the present invention can also be by utilizing optical-electronic oscillator structure to realize the linear frequency modulation wideband radar flashlight electrical oscillator output of wavelength division multiplexing.
Brief description of the drawings
Fig. 1 is the structural representation of the photoelectricity generation device of wavelength division multiplexing wide-band LFM signal of the present invention;
Fig. 2 is the structural representation that the photoelectricity generation device of wavelength division multiplexing wide-band LFM signal of the invention process is applied in Optical Controlled Phased Array Antenna system.
Symbol list:
1-broad band low frequency radio-frequency signal source, 2-multiwavelength laser source, 3-image intensifer, 4-electrooptic modulator, 5-light wavelength division multiplexing, 6-optical-electrical converter.
Embodiment:
Referring to the accompanying drawing that the embodiment of the present invention is shown, below will describe in more detail the present invention.But the present invention can be with realizations such as multi-form, specifications, and should not be construed as the restriction of the embodiment being subject in this proposition.On the contrary, it is abundant and complete open in order to reach proposing these embodiment, and makes more relevant those skilled in the art person understand scope of the present invention completely.In these accompanying drawings, for clearly visible, may zoom in or out relative size.
Referring now to Fig. 1 describes in detail according to the photoelectricity generation device of wavelength division multiplexing wide-band LFM signal of the invention process, as shown in Figure 1, this device comprises laser, electrooptic modulator 4, some optical-electrical converters 6, light wavelength division multiplexing 5 and broad band low frequency radio-frequency signal source 1; Wherein, this electrooptic modulator 4 comprises radiofrequency signal entrance, light entrance, light exit and working point control interface; This broad band low frequency radio-frequency signal source 1 is connected with this electrooptic modulator 4 by radiofrequency signal entrance, this laser is connected with this electrooptic modulator by light entrance, this light wavelength division multiplexing 5 is connected with this electrooptic modulator 4 by light exit, and this optical-electrical converter 6 is connected with light wavelength division multiplexing 5; The radiofrequency signal producing by this broad band low frequency radio-frequency signal source 1 linear frequency modulation enters this electrooptic modulator 4 by radiofrequency signal entrance, the light source that this laser produces enters electrooptic modulator 4 by light entrance, the light source of modulating by this electrooptic modulator 4 enters light wavelength division multiplexing 5 by light exit, aerial array is changed and entered to the light source of processing after this by light wavelength division multiplexing 5 by optical-electrical converter 6, and the radiofrequency signal all increasing through frequency and bandwidth is occurred by aerial array.
Wherein, between this broad band low frequency radio-frequency signal source 1 and electrooptic modulator 4, be provided with radio frequency amplifier, for compensating radio frequency loss on electricity link; Between this broad band low frequency radio-frequency signal source 1 and electrooptic modulator 4, be provided with image intensifer 3(or for microwave amplifier), by the radio frequency loss on these image intensifer 3 compensate for optical links; Between this optical-electrical converter 6 and broad band low frequency radio-frequency signal source 1, laser and light wavelength division multiplexing 5, be all connected by general single mode fiber.
And this light wavelength division multiplexing 5 is diaphragm type light wavelength division multiplexing or array waveguide grating (AWG:Array Waveguide Grating) formula wavelength division multiplexer, and is connected by optical fiber between this light wavelength division multiplexing 5 and electrooptic modulator; This laser is multiwavelength laser source 2, produce the light source of multiple wavelength by this multiwavelength laser source 2, and carry out rf modulations by this electrooptic modulator 4, and the wavelength of multiple signals that this multiwavelength laser source 2 produces is corresponding one by one with the wavelength of the multi-wavelength signals after light wavelength division multiplexing 5, and the number of this optical-electrical converter 6 is identical with light wavelength division multiplexing 5 number of active lanes, can the corresponding optical-electrical converter 6 of each signal in the time carrying out opto-electronic conversion thereby ensure.
In specific implementation process, the connection of the photoelectricity generation device by above-mentioned wavelength division multiplexing wide-band linearity modulation signal, the photoelectricity of realizing wavelength division multiplexing wide-band linearity modulation signal produces, and the concrete steps of its generation are:
This broad band low frequency radio-frequency signal source 1 is produced linear FM signal and is entered this electrooptic modulator 4 by this radiofrequency signal entrance by external electrical technology;
This laser produces multi wave length illuminating source and enters this electrooptic modulator 4 by this light entrance;
Adjust the bias voltage of electrooptic modulator 4 and select the operating state of electrooptic modulator 4, and linear FM signal is carried out to the light territory frequency spectrum operation of modulation signal, produce light signal;
Light signal is exported and is entered a wavelength division multiplexed light time delay network by light exit, realize the time delay of light signal, and the light signal through time delay enters this light wavelength division multiplexing 5, pass through again this optical-electrical converter 6, the radiofrequency signal that output center frequency and bandwidth double simultaneously, and enter aerial array, by aerial array, the upper frequency after multiplication and the emission of radio frequency signals of larger bandwidth are gone out.
Wherein, in specific implementation process, between this broad band low frequency radio-frequency signal source 1 and multiwavelength laser source 2 and electrooptic modulator 4, form respectively electricity link and optical link, and radio frequency amplifier and image intensifer all can be set respectively on this electricity link and optical link, thereby can compensate radio frequency loss by this radio frequency amplifier and image intensifer 3; The wavelength of the light signal of this light wavelength division multiplexing 5 is corresponding one by one with the wavelength of the light source that laser produces, and the wavelength number that the number of this optical-electrical converter 6 produces with laser and the number of active lanes of light wavelength division multiplexing 5 are all identical; And, this electrooptic modulator 4 can be by selecting suitable bias voltage and the operating state of electrooptic modulator 4, make to export from this optical-electrical converter 6 signal of telecommunication obtaining linear FM signal is carried out to frequency multiplication or carrier wave inhibition operation, simultaneously, can, by selecting the suitable offset operation point of this electrooptic modulator 4, make the bandwidth of exporting the signal of telecommunication obtaining from this optical-electrical converter 6 be no more than the bandwidth of these light wavelength division multiplexing 5 channel spacings.
Practical example
In specific implementation process, as shown in Figure 2, the photoelectricity generation device of this wavelength division multiplexing wide-band LFM signal is applied in Optical Controlled Phased Array Antenna system, and its concrete operation principle is as follows:
In specific implementation process, this optical carrier is expressed as:
E(t)=E
ocos[ω
ot+φ
o(t)]，
Wherein, this ω
o, φ
obe respectively frequency and the phase place of optical carrier.
This optical carrier is modulated and is obtained through electrooptic modulator intensity:
Wherein, this φ
dC, V
πthe DC offset voltage and the alternate current operation point voltage that are respectively electrooptic modulator, be labeled as
after being launched, obtain:
Wherein, by regulating this driving voltage φ
dCwith signal amplitude V
e, realize the selection to output signal frequency and form.If taking 4 frequencys multiplication as example, select φ
dCpoint modulation, and filter light carrier, after surveying, photodetector obtains:
After beat frequency, centre frequency and bandwidth all can become 4 times of original linear FM signal.In microwave photon learns a skill, can also, by utilizing frequency spectrum operating technology, realize the increase of centre frequency and other multiples of bandwidth, do not repeat at this.
Realized the linear FM signal of utilizing the linear FM signal of lower frequency and less bandwidth to realize higher frequency band and higher bandwidth by the photoelectricity generation device of the multiplexing wide-band LFM signal of waveform of the present invention, and do not need laser to carry out internal modulation processing, thereby effectively reduce the volume of system, and improved the treatment effeciency of system.
The photoelectricity generation device of wavelength division multiplexing wide-band LFM signal provided by the invention, can implement series connection by multiple these devices, thereby can meet the demand that more high band, larger bandwidth linear frequency modulation signal photoelectricity produce, and can utilize optical-electronic oscillator structure to achieve the linear frequency modulation wideband radar flashlight electrical oscillator output of wavelength division multiplexing, therefore, the relevant apparatus that the present invention is not limited to the present embodiment proposition is limited, and can also produce by other device raising photoelectricity generation efficiencies and high band, high bandwidth linear FM signal photoelectricity are set.
Obviously, those skilled in the art can carry out various changes and distortion and not depart from the spirit and scope of the present invention the present invention.Like this, if these amendments of the present invention and distortion belong in the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these and changes interior.
Claims (10)
1. a photoelectricity generation device for wavelength division multiplexing wide-band LFM signal, is characterized in that, comprises laser, electrooptic modulator, some optical-electrical converters, light wavelength division multiplexing and broad band low frequency radio-frequency signal source;
Wherein, described electrooptic modulator comprises radiofrequency signal entrance, light entrance, light exit and working point control interface;
Described broad band low frequency radio-frequency signal source is connected with described electrooptic modulator by described radiofrequency signal entrance, described laser is connected with described electrooptic modulator by described light entrance, described light wavelength division multiplexing is connected with described electrooptic modulator by described light exit, and described optical-electrical converter is connected with described light wavelength division multiplexing;
The radiofrequency signal producing by described broad band low frequency radio-frequency signal source linear frequency modulation enters described electrooptic modulator by described radiofrequency signal entrance, the light source that described laser produces enters electrooptic modulator by described light entrance, the light source of modulating by described electrooptic modulator enters described wavelength division multiplexer by described light exit, changes and enter aerial array by described wavelength division multiplexer light source after treatment by described optical-electrical converter.
2. the photoelectricity generation device of wavelength division multiplexing wide-band LFM signal according to claim 1, is characterized in that, between described broad band low frequency radio-frequency signal source and described electrooptic modulator, is provided with radio frequency amplifier.
3. the photoelectricity generation device of wavelength division multiplexing wide-band LFM signal according to claim 1, is characterized in that, between described broad band low frequency radio-frequency signal source and described electrooptic modulator, is provided with image intensifer.
4. the photoelectricity generation device of wavelength division multiplexing wide-band LFM signal according to claim 1, it is characterized in that, between described optical-electrical converter and described broad band low frequency radio-frequency signal source, described laser and described wavelength division multiplexer, be connected by general single mode fiber respectively.
5. the photoelectricity generation device of wavelength division multiplexing wide-band LFM signal according to claim 1, is characterized in that, described light wavelength division multiplexing is diaphragm type light wavelength division multiplexing or array waveguide grating formula wavelength division multiplexer.
6. the photoelectricity generation device of wavelength division multiplexing wide-band LFM signal according to claim 1, it is characterized in that, described laser is multiwavelength laser source, produces the light source of multiple wavelength by described multiwavelength laser source, and carries out rf modulations by described electrooptic modulator.
7. a photoelectricity production method for wavelength division multiplexing wide-band linearity modulation signal, utilizes the photoelectricity generation device of wavelength division multiplexing wide-band linearity modulation signal as claimed in claim 1 to produce photosignal, it is characterized in that, comprises the steps:
Described broad band low frequency radio-frequency signal source is produced linear FM signal and is entered described electrooptic modulator by described radiofrequency signal entrance by external electrical technology;
Described laser produces multi wave length illuminating source and enters described electrooptic modulator by described light entrance;
Adjust the bias voltage of described electrooptic modulator and select the operating state of described electrooptic modulator, and linear FM signal is carried out to the light territory frequency spectrum operation of modulation signal, and produce light signal;
A wavelength division multiplexed light time delay network is exported and entered to described light signal by described light exit, realize the time delay of light signal, and, light signal through time delay enters described light wavelength division multiplexing, pass through again described optical-electrical converter, the radiofrequency signal that output center frequency and bandwidth double simultaneously, and enter aerial array.
8. the photoelectricity production method of wavelength division multiplexing wide-band linearity modulation signal according to claim 7, it is characterized in that, described broad band low frequency radio-frequency signal source and described laser respectively and between described electrooptic modulator, be provided with radio frequency amplifier and image intensifer, respectively by described radio frequency amplifier and described image intensifer compensation radio frequency loss.
9. the photoelectricity production method of wavelength division multiplexing wide-band linearity modulation signal according to claim 7, it is characterized in that, the wavelength of the light signal by described light wavelength division multiplexing is corresponding one by one with the wavelength of the light source that described laser produces, and the number of described optical-electrical converter is all identical with the number of active lanes of described light wavelength division multiplexing with the wavelength number of described laser generation.
10. the photoelectricity production method of wavelength division multiplexing wide-band linearity modulation signal according to claim 8, it is characterized in that, described electrooptic modulator, by selecting suitable bias voltage and the operating state of described electrooptic modulator, makes to export from described optical-electrical converter the signal of telecommunication obtaining described linear FM signal is carried out to frequency multiplication or carrier wave inhibition operation; And, select the offset operation point of described electrooptic modulator by the control of described working point control interface, make the bandwidth of exporting the signal of telecommunication obtaining from described optical-electrical converter be no more than the bandwidth of described light wavelength division multiplexing channel spacing.
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| CN107431552A (en) * | 2015-04-15 | 2017-12-01 | 华为技术有限公司 | Optical module and the network equipment |
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| CN104316908A (en) * | 2014-10-08 | 2015-01-28 | 上海航天电子通讯设备研究所 | Optically controlled phased array radar front end transmitting and receiving method and device |
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| CN106788764A (en) * | 2017-02-21 | 2017-05-31 | 电子科技大学 | A kind of self feed back signal modulating method towards 5G RoF |
| CN110365413A (en) * | 2019-07-03 | 2019-10-22 | 北京迈微时代科技有限公司 | A kind of light load radio frequency beam shaping system based on relevant frequency comb |
| CN111404571A (en) * | 2020-03-19 | 2020-07-10 | 博微太赫兹信息科技有限公司 | System and method for improving radio frequency of broadband wireless communication |
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