CN103166706B - Based on the photoelectric oscillation device of the frequency-tunable of wide spectrum light source - Google Patents
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Abstract
A kind of photoelectric oscillation device of the frequency-tunable based on wide spectrum light source, comprise: wide spectrum light source, optical filter, first image intensifer, second image intensifer, first fiber coupler, second fiber coupler, 3rd fiber coupler, first Polarization Controller, second Polarization Controller, variable optical delay line, electrooptic modulator, dispersive optical fiber, first photodetector, second photodetector, microwave amplifier, first optical patchcord, second optical patchcord, 3rd optical patchcord, 4th optical patchcord, 5th optical patchcord, six fibers wire jumper, 7th optical patchcord, first cable and the second cable.The present invention can produce the adjustable microwave signal in broadband, adopts microwave photon filter, replaces traditional some filter, and avoid traditional defect that can not produce at some frequency based on the optical-electronic oscillator of wide range source cutting, have low cost, broadband is adjustable, the advantage that phase noise is low.
Description
Technical field
The present invention relates to the device of a kind of optical communication and microwave regime, specifically a kind of tunable photoelectric oscillation device based on wide spectrum light source.
Background technology
The microwave signal of low phase noise, frequency-adjustable, carries in the application such as microwave communication, radar at radio communication, light and has important application.Wherein phase noise is one of main important indicator weighing microwave, and it mainly refers to short-term frequency stability.At present, mainstream scheme market producing high-quality microwave signal adopts quartz (controlled) oscillator, but only there is the oscillation mode of high q-factor at low frequency place in quartz (controlled) oscillator, obtain the microwave signal of higher frequency, need to connect frequency multiplier circuit after quartz (controlled) oscillator, by frequency-doubling method, microwave signal is converted to high frequency, but along with the increase of frequency multiplication number of times, microwave signal quality constantly will worsen.Although the phase noise of atomic clock can reach-150dBc/Hz10KHz, output frequency can only to tens MHz.Therefore, traditional scheme is difficult to obtain high-quality, high-frequency and tunable microwave signal on a large scale.
Along with the development of photoelectric technology, the people such as the JianpingYao of University of Ottawa of Canada first proposed the concept of optical-electronic oscillator (see X.S.YaoandL.Maleki, " Optoelectronicmicrowaveoscillator; " J.Opt.Soc.Amer.B13,1725 – 1735,1996).Optical-electronic oscillator generally main composition comprises: the microwave band-pass filter of a laser, an electrooptic modulator, one section of delay device, photodetector, a microwave amplifier and a high q-factor.Its operation principle is: the continuous light that produced by electrooptic modulator modulated laser of white noise that microwave amplifier produces, the laser after modulation through a section single-mould fiber delay line laggard enter photodetector be converted to the signal of telecommunication; The signal of telecommunication is by feeding back to electrooptic modulator after electrical filter, microwave amplifier; Due to the time-delay characteristics of monomode fiber, whole closed loop will produce the equally spaced oscillation mode of a series of frequency; And the existence of microwave band-pass filter due to high q-factor, only there is an oscillation mode to remain, finally realize high-quality single-mode oscillation.
The microwave signal that although above-mentioned optical-electronic oscillator can produce high-quality, high frequency exposes, its tuning range is limited to the tuning range of electrical filter.In order to overcome this limitation, researcher proposes various new optical-electronic oscillator method and structure in the recent period.The people such as JianpingYao utilize modulator cascade and chirped fiber grating, phase shift bragg grating constitutes the adjustable optical-electronic oscillator in broadband, but although its broadband is adjustable, but supermode noise is larger, the impact of microwave frequency Stimulated Light device wave length shift is (see B.Yang, X.F.Jin, X.M.Zhang, S.L.Zheng, H.Chi, andY.Wang, " Awidebandfrequency-tunableoptoelectronicoscillatorbasedo nanarrowbandphase-shiftedFBGandwavelengthtuningoflaser, " IEEEPhoton.Technol.Lett., 24 (1), 73 – 75, 2012).Utilize again the list response microwave photon filter construction based on wideband light source afterwards, achieve the tunable of microwave, but owing to being subject to dispersion carrier wave depression effect, some frequency is by suppressed, cannot realize carrying out continuous tuning (see M.Li to microwave frequency, W.Z.Li, J.P.Yao, " Tunableoptoelectronicoscillatorincorporatingahigh-Qspect rum-slicedphotonicmicrowavetransversalfilter; " IEEEPhoton.Technol.Lett., 24 (14), 1251 – 1253,2012).Meanwhile, traditional optical-electronic oscillator adopts electrical filter as modeling device, and the tuning range of electrical filter is limited, therefore Traditional photovoltaic oscillator is difficult to accomplish wide-band tuning.Therefore, adopt microwave photon signal processing technology, utilize microwave photon filter to be combined the development trend that will be tunable electro-optic oscillator of future generation with electrical oscillator.
Summary of the invention
The object of the present invention is to provide the optical-electronic oscillator that a kind of broadband is adjustable, thus realize the continuously adjustabe on a large scale to optical-electronic oscillator.
Technical solution of the present invention is as follows:
A kind of photoelectric oscillation device of the frequency-tunable based on wide spectrum light source, feature is that its formation comprises: wide spectrum light source, optical filter, first image intensifer, second image intensifer, first fiber coupler, second fiber coupler, 3rd fiber coupler, first Polarization Controller, second Polarization Controller, variable optical delay line, electrooptic modulator, dispersive optical fiber, first photodetector, second photodetector, microwave amplifier, first optical patchcord, second optical patchcord, 3rd optical patchcord, 4th optical patchcord, 5th optical patchcord, six fibers wire jumper, 7th optical patchcord, first cable and the second cable, the annexation of above-mentioned component is as follows:
The output of described wide spectrum light source is connected with the input of described optical filter by first paragraph optical patchcord, the input of output termination first image intensifer of this optical filter, the output of this first image intensifer connects the input of the first fiber coupler through the second optical patchcord, first output of this first fiber coupler is connected with the input of the first Polarization Controller through the 3rd optical patchcord, the light input end of the photoelectricity intensity modulator described in output termination of the first Polarization Controller, the output of this electrooptic modulator connects the first input end of the second fiber coupler through six fibers wire jumper,
Second output of the first described fiber coupler is connected with the input of the second Polarization Controller by the 4th optical patchcord, the input of the tunable optical delay line described in output termination of this second Polarization Controller, the output of this tunable optical delay line is connected with the second input of the second described fiber coupler through the 5th section of optical patchcord;
The dispersive optical fiber described in output termination of the second described fiber coupler, the input of second image intensifer described in another termination of this dispersive optical fiber, the output of this second image intensifer connects the input of the 3rd described fiber coupler through the 7th optical patchcord, first of 3rd fiber coupler exports the first photodetector described in termination, and the output of the first photodetector is the microwave signal output of this device;
The input of second photodetector of the second output described in termination of the 3rd described fiber coupler, the output of this second photodetector connects the input of described microwave amplifier through the first cable, the output of this microwave amplifier is connected through the electrical input of the second cable with described electrooptic modulator.
Described wide spectrum light source is spontaneous radiation light source (ASE) or super-radiance light emitting diode light source (SLED).
Described optical filter is tunable optical filter or Bragg grating.
Described electrooptic modulator is light intensity modulator or optical phase modulator.
Described light intensity modulator is lithium niobate MZ structured light intensity modulator or electroabsorption modulator, and described phase-modulator is lithium niobate phase modulator.
Described Dispersive Devices is monomode fiber, dispersion compensating fiber or linear chirp optical fiber grating, and the selection range of fiber lengths is several meters ~ thousands of rice.
Described microwave amplifier is RF amplifier or low noise amplifier.
First output of the 3rd described fiber coupler and the output of the second output are than being 73%:23%.
The first described image intensifer and the second image intensifer, for amplifying optical signals, make the Insertion Loss of link reduce, and improves the open-loop gain of photoelectricity link.
Described dispersive optical fiber is high q-factor microwave energy-storage device.
The arm structure that the first described fiber coupler 6 and the second coupler 15 are linked to be, through dispersion, due to the continuous conversion of intensity modulated and phase-modulation, cuts spectrum by generation sinusoidal continuously.
First output 73% of the 3rd described fiber coupler and the first commercial photodetector 20 form and export microwave link, to reduce micro-wave coupler or power splitter to the reduction of microwave power in ring.
Described microwave amplifier is gain device, for amplifying the microwave signal that described photodetector exports, and makes the open-loop gain in electro-optical feedback loop be greater than 1.
The microwave signal that described tunable optical delay line is used for described optical-electronic oscillator produces carries out continuous tuning.
The present invention has the following advantages:
1, the present invention is based on the photoelectric oscillation device of the frequency-tunable of wide spectrum light source, utilize a wide spectrum light source, electrooptic modulator, tunable optical delay line, a photodetector and two fiber couplers together constitute microwave photon filter, and it combined with optical-electronic oscillator.By the time delay size of tuning tunable optical delay line, the continuous tuning to microwave photon filter can be realized, avoid carrier wave depression effect, thus realize the continuously adjustabe on a large scale to optical-electronic oscillator.
2, the present invention, optical modulator is utilized to modulate wide spectrum light source, utilize dispersion to the continuous conversion of modulation system-intensity modulated and phase-modulation, the hydro-electric cutting method of equivalence realizes the cutting to wide range source, produce sinusoidal continuous light carrier wave, thus realize the microwave photon filter of single response, avoid the carrier wave depression effect that the cutting of traditional wide range produces simultaneously.
3, the present invention, make use of dispersive optical fiber as microwave energy-storage element, and the microwave signal of output has splendid phase noise characteristic, by changing tunable optical delay line, realizes the continuously adjustabe of microwave frequency.
4, the present invention can carry out the continuous tuning of microwave frequency in very wide scope, and tuning range is only limited to modulator, photodetector, the gain of microwave amplifier and bandwidth.
Accompanying drawing explanation
Fig. 1 is the structural representation of the photoelectric oscillation device embodiment of the frequency-tunable that the present invention is based on wide spectrum light source.From wide spectrum light source to photodetector, wherein export the microwave photon filter constituting single response.
Fig. 2 is equivalent wide range cutting process in microwave photon filter.
Fig. 3 is modeling principle schematic of the present invention.
Fig. 4 is the microwave schematic diagram that the present invention produces.
Fig. 5 is the relation curve of the amount of delay of the microwave frequency that produces of the present invention and tunable optical delay line.
Embodiment
A specific embodiment of the present invention is provided below in conjunction with accompanying drawing.The present embodiment is implemented premised on technical scheme of the present invention, gives detailed execution mode and process, but protection scope of the present invention should not be limited to following embodiment.
First refer to Fig. 1, Fig. 1 is the structural representation of the photoelectric oscillation device embodiment of the frequency-tunable that the present invention is based on wide spectrum light source.The photoelectric oscillation device that the present invention is based on the frequency-tunable of wide spectrum light source is the microwave photon filter adopting wide range source, two fiber couplers, a tunable optical delay line, a Dispersive Devices formation, realizes the modeling function in optical-electronic oscillator.As seen from the figure, the present invention is based on the photoelectric oscillation device of the frequency-tunable of wide spectrum light source, its formation comprises: wide spectrum light source 1, optical filter 3, first image intensifer 4, second image intensifer 17, first fiber coupler 6, second fiber coupler 15, 3rd fiber coupler 19, first Polarization Controller 9, second Polarization Controller 11, variable optical delay line 12, electrooptic modulator 10, dispersive optical fiber 16, first photodetector 20, second photodetector 22, microwave amplifier 24, first optical patchcord 2, second optical patchcord 5, 3rd optical patchcord 7, 4th optical patchcord 8, 5th optical patchcord 13, six fibers wire jumper 14, 7th optical patchcord 18, first cable 23 and the second cable 25, the annexation of above-mentioned component is as follows:
The output of described wide spectrum light source 1 is connected with the input of described optical filter 3 by first paragraph optical patchcord 2, the input of output termination first image intensifer 4 of this optical filter 3, the output of this first image intensifer 4 connects the input of the first fiber coupler 6 through the second optical patchcord 5, first output of this first fiber coupler 6 is connected through the input of the 3rd optical patchcord 8 with the first Polarization Controller 9, the light input end of the photoelectricity intensity modulator 10 described in output termination of the first Polarization Controller 9, the output of this electrooptic modulator 10 connects the first input end of the second fiber coupler 15 through six fibers wire jumper 14,
Second output of the first described fiber coupler 6 is connected with the input of the second Polarization Controller 11 by the 4th optical patchcord 7, the input of the tunable optical delay line 12 described in output termination of this second Polarization Controller 11, the output of this tunable optical delay line 12 is connected through second input of the 5th section of optical patchcord 13 with the second described fiber coupler 15;
One end of the dispersive optical fiber 16 described in output termination of the second described fiber coupler 15, the input of second image intensifer 17 described in another termination of this dispersive optical fiber 16, the output of this second image intensifer 17 connects the input of the 3rd described fiber coupler 19 through the 7th optical patchcord 18, first of 3rd fiber coupler 19 output 21 exporting the first photodetector 20, first photodetector 20 described in termination is the microwave signal output of this device;
The input of second photodetector 22 of the second output described in termination of the 3rd described fiber coupler 19, the output of this second photodetector 22 connects the input of described microwave amplifier 24 through the first cable 23, the output of this microwave amplifier 24 is connected through the electrical input of the second cable 25 with described electrooptic modulator 10.
Described wide spectrum light source 1 is spontaneous radiation light source (ASE) or super-radiance light emitting diode light source (SLED).Described optical filter 3 is tunable optical filter or Bragg grating.Electrooptic modulator 10 is electro-optical conversioning device, and it is light intensity modulator or optical phase modulator.Light intensity modulator 10 is lithium niobate MZ structured light intensity modulator or electroabsorption modulator, and described phase-modulator is lithium niobate phase modulator.Dispersive Devices 16 is monomode fiber, dispersion compensating fiber or linear chirp optical fiber grating, and the selection range of fiber lengths is several meters ~ thousands of rice.Microwave amplifier 24 is RF amplifier or low noise amplifier.First output of the 3rd fiber coupler 19 and the output of the second output are than being 73%:23%.
Comprising: a wide spectrum light source 1, its output is connected with an optical filter 3 by first paragraph optical patchcord 2; Optical filter 3, it exports connection first image intensifer EDFA4; EDFA4 is connected to a 3-dB fiber coupler 6 through the second optical patchcord 5 again; An output of the one 3-dB fiber coupler 6 is connected with the first Polarization Controller 11 through second segment optical patchcord 7, and its another output is connected with the second Polarization Controller 9 by the 3rd section of wire jumper 8; The other end of Polarization Controller 11 connects tunable optical delay line 12; The other end of the first Polarization Controller 9 is connected with photoelectricity intensity modulator 10; The output of tunable optical delay line 12 connects first input of the 2nd 3-dB fiber coupler 15 through the 4th section of optical patchcord 14, the output of photoelectricity intensity modulator 11 connects second input of the 2nd 3-dB fiber coupler 15 through the 5th optical patchcord 13; Through the coupling of the 2nd 3-dB fiber coupler 15, signal, after dispersive optical fiber 16 dispersion, amplifies through the second fiber amplifier EDFA17; EDFA17 exports and is connected through the input of six fibers wire jumper 18 with the 3rd 27:73 fiber coupler 19; One of the output of the 3rd coupler 19 (27%) connects the second commercial photodetector 22, second output port (73%) and connects on the first commercial photodetector 20; The signal of telecommunication changed through detector 22 is connected to microwave amplifier 24 through the first cable 23; The amplifying signal of microwave amplifier 24 is input to described photoelectricity intensity modulator through the second cable 25, forms closed loop.Wherein output 21 is microwave signal output of the present invention.
Operation principle of the present invention is as follows:
First, wide spectrum light source 1 cuts out the spectrum of one fixed width as carrier wave through optical filter 3, be input to the light input end of electrooptic modulator, by the RF end modulation of the output noise of microwave amplifier 24 through electrooptic modulator 10, signal after modulation is together with the carrier wave through variable optical delay line 12, dispersion compensating fiber is entered after coupler 15 is coupled, after dispersion postpones, enter EDFA17 again amplify, the signal of telecommunication is converted to finally by photodetector 22, after being amplified by microwave amplifier 24, form electro-optical feedback.Due to the time-delay characteristics of dispersive optical fiber, there is the equally spaced high q-factor oscillation mode of a series of frequency in above-mentioned electro-optical feedback loop, and phase noise is splendid.
Export to select a formation single-mode oscillation from these high q-factor oscillation modes, the present invention utilizes a low cost wideband light source, an electrooptic modulator, and two fiber couplers and dispersive optical fiber, the carrier wave of the single order sideband that arm two is produced by the nonlinear effect of electrooptic modulator and arm one is due to dispersion interaction, detect through photodetector, intensity modulated and phase modulation method constantly change, form sinusoid and cut spectrum continuously, constitute arrowband list response microwave photon transversal filter, and by changing the amount of delay of arm one, thus the interval changed between adjacent sine spectrum, namely the centre frequency of this microwave photon filter is changed.This filter can overcome the carrier wave depression effect that tradition produces based on wide range cutting, using the input of the output of electric amplifier as electrooptic modulator, form closed loop, namely define optical-electronic oscillator, above-mentioned microwave photon filter instead of traditional microwave filter.This microwave photon filter can select single-mode from numerous oscillation modes, realizes the single-mode output of optical-electronic oscillator.The modeling operation principle of microwave photon filter as shown in Figure 2.
Fig. 2 illustrates the tap coefficient of microwave photon filter.Enter photo detector signal to be made up of two parts, a part is produced by the single order sideband beat frequency of arm 2 carrier wave and the non-linear generation of arm 2 electrooptic modulator, this part constitutes low pass effect filter, as adopted phase-modulator, because two single order side band phases are contrary, beat frequency only produces direct current, therefore can remove lowpass response; Another part is made up of the single order sideband of arm 1 carrier wave and arm 2, it is the same that this part and tradition respond microwave photon filter based on the list that wide range source is cut, due to the continuous light sampling cutting spectrum for sinusoidal pattern, corresponding frequency domain is the band pass filter of single response, thus achieves and singly respond microwave photon filter.Simultaneously, the sampling cutting spectrum of this sinusoidal pattern, the dispersion coming from Dispersive Devices constantly alternately changes the intensity modulated mode of modulation Signal transmissions and phase modulation method, can avoid the carrier wave depression effect of traditional double sideband intensity modulated, thus avoids filter and lack at some frequency.When this filter connects microwave amplifier formation closed loop, form a large amount of equally spaced oscillation mode in ring while, microwave photon filter starts to realize modeling, thus forms single-mode output.And the total dispersion of the centre frequency of microwave photon filter and ring internal dispersion device inversely, with the amount of delay linear proportional relation of tunable optical delay line.
Therefore by regulating variable optical delay line, the band pass filter of an adjustable wide-band microwave list response can be produced on a large scale.As Fig. 3.By changing the delay of variable optical delay line, just can carry out tuning to the oscillation mode of optical-electronic oscillator, tuning compensation equals the mode frequencey interval that dispersion compensating fiber is introduced.
Fig. 4 for this reason optical-electronic oscillator produce microwave, by component influences, temporarily can reach 7GHz nearly.The relation of Fig. 5 amount of delay of optical-electronic oscillator frequency of oscillation and tunable optical delay line for this reason.
Claims (8)
1., based on a photoelectric oscillation device for the frequency-tunable of wide spectrum light source, feature is that its formation comprises: wide spectrum light source (1), optical filter (3), first image intensifer (4), second image intensifer (17), first fiber coupler (6), second fiber coupler (15), 3rd fiber coupler (19), first Polarization Controller (9), electrooptic modulator (10), variable optical delay line (12), second Polarization Controller (11), dispersive optical fiber (16), first photodetector (20), second photodetector (22), microwave amplifier (24), first optical patchcord (2), second optical patchcord (5), 3rd optical patchcord (7), 4th optical patchcord (8), 5th optical patchcord (13), six fibers wire jumper (14), 7th optical patchcord (18), first cable (23) and the second cable (25), the annexation of above-mentioned component is as follows:
The output of described wide spectrum light source (1) is connected with the input of described optical filter (3) by the first optical patchcord (2), the input of output termination first image intensifer (4) of this optical filter (3), the output of this first image intensifer (4) connects the input of the first fiber coupler (6) through the second optical patchcord (5), first output of this first fiber coupler (6) is connected with the input of the first Polarization Controller (9) through the 3rd optical patchcord (8), the light input end of the electrooptic modulator (10) described in output termination of the first Polarization Controller (9), the output of this electrooptic modulator (10) connects the first input end of the second fiber coupler (15) through six fibers wire jumper (14),
Second output of described the first fiber coupler (6) is connected with the input of the second Polarization Controller (11) by the 4th optical patchcord (7), the input of the variable optical delay line (12) described in output termination of this second Polarization Controller (11), the output of this variable optical delay line (12) is connected through second input of the 5th optical patchcord (13) with described the second fiber coupler (15);
The dispersive optical fiber (16) described in output termination of described the second fiber coupler (15), the input of second image intensifer (17) described in another termination of this dispersive optical fiber (16), the output of this second image intensifer (17) connects the input of the 3rd described fiber coupler (19) through the 7th optical patchcord (18), first of 3rd fiber coupler (19) exports the first photodetector (20) described in termination, and the output (21) of the first photodetector (20) is microwave signal output;
The input of second photodetector (22) of the second output described in termination of the 3rd described fiber coupler (19), the output of this second photodetector (22) connects the input of described microwave amplifier (24) through the first cable (23), the output of this microwave amplifier (24) is connected through the electrical input of the second cable (25) with described electrooptic modulator (10).
2. the photoelectric oscillation device of the frequency-tunable based on wide spectrum light source according to claim 1, is characterized in that, described wide spectrum light source (1) is spontaneous radiation light source or super-radiance light emitting diode light source.
3. the photoelectric oscillation device of the frequency-tunable based on wide spectrum light source according to claim 1, is characterized in that, described optical filter (3) is tunable optical filter or Bragg grating.
4. the photoelectric oscillation device of the frequency-tunable based on wide spectrum light source according to claim 1, is characterized in that, described electrooptic modulator (10) is electro-optical conversioning device, and it is light intensity modulator or optical phase modulator.
5. the photoelectric oscillation device of the frequency-tunable based on wide spectrum light source according to claim 4, it is characterized in that, described light intensity modulator (10) is lithium niobate MZ structured light intensity modulator or electroabsorption modulator, and described phase-modulator is lithium niobate phase modulator.
6. the photoelectric oscillation device of the frequency-tunable based on wide spectrum light source according to claim 1, it is characterized in that, described dispersive optical fiber (16) is monomode fiber, dispersion compensating fiber or linear chirp optical fiber grating, and the selection range of fiber lengths is several meters ~ thousands of rice.
7. the photoelectric oscillation device of the frequency-tunable based on wide spectrum light source according to claim 1, is characterized in that, described microwave amplifier (24) is RF amplifier or low noise amplifier.
8. the photoelectric oscillation device of the frequency-tunable based on wide spectrum light source according to any one of claim 1 to 7, is characterized in that, the first output of the 3rd described fiber coupler (19) and the output of the second output are than being 73%:23%.
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| CN108919244B (en) * | 2018-05-18 | 2021-01-12 | 南京航空航天大学 | Microwave photon all-band radar detection method and microwave photon all-band radar |
| CN109525244B (en) * | 2018-10-10 | 2020-10-30 | 浙江大学 | Coupling type photoelectric oscillation signal generator with high-speed and adjustable frequency |
| CN109193318B (en) * | 2018-11-12 | 2020-04-21 | 中国科学院半导体研究所 | Up-down frequency conversion system based on mode-locked laser |
| CN109861645B (en) * | 2019-01-04 | 2024-02-13 | 武汉邮电科学研究院有限公司 | Frequency multiplier for microwave broadband communication |
| CN109696418B (en) * | 2019-02-27 | 2021-08-10 | 南京科远智慧科技集团股份有限公司 | Heterodyne balance detection system and detection method applied to TDLAS direct absorption method under low signal-to-noise ratio |
| CN111917484A (en) * | 2020-07-07 | 2020-11-10 | 电子科技大学 | Microwave photon filter with negative tap coefficient and photoelectric oscillator |
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