CN103166706A - Tunable-frequency photoelectric oscillation device based on wide spectrum light source - Google Patents
Tunable-frequency photoelectric oscillation device based on wide spectrum light source Download PDFInfo
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Abstract
A tunable-frequency photoelectric oscillation device based on a wide spectrum light source comprises the wide spectrum light source, an optical filter, a first light amplifier, a second light amplifier, a first optical fiber coupler, a second optical fiber coupler, a third optical fiber coupler, a first polarization controller, a second polarization controller, a dimming-adjustable delay line, an photoelectric modulator, a color-dispersion optical fiber, a first photoelectric detector, a second photoelectric detector, a microwave amplifier, a first optical fiber patch cord, a second optical fiber patch cord, a third optical fiber patch cord, a fourth optical fiber patch cord, a fifth optical fiber patch cord, a sixth optical fiber patch cord, a seventh optical fiber patch cord, a first cable and a second cable. The tunable-frequency photoelectric oscillation device based on the wide spectrum light source can generate wideband-adjustable microwave signals, adopts a microwave photon filter to replace a traditional point filter, overcomes the defect that a traditional photoelectric oscillator based on wide spectrum source cutting can not generate signals at certain frequency points, and has the advantages of being low in cost, adjustable in wideband, and low in phase noise.
Description
Technical field
The present invention relates to the device of a kind of optical communication and microwave regime, specifically a kind of tunable optoelectronic oscillation device based on wide spectrum light source.
Background technology
Low phase noise, the microwave signal that frequency is adjustable are carried at radio communication, light in the application such as microwave communication, radar and are had important application.Wherein phase noise is one of main important indicator of weighing in microwave, and it mainly refers to the short-term frequency stability.At present, the main flow scheme that produces the high-quality microwave signal on market is to adopt quartz (controlled) oscillator, but only there is the oscillation mode of high Q value in quartz (controlled) oscillator at the low frequency place, 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, the microwave signal quality will worsen constantly.Although the phase noise of atomic clock can reach-150dBc/Hz@10KHz, output frequency can only arrive tens MHz.Therefore, traditional scheme be difficult to obtain high-quality, high-frequency and tunable microwave signal on a large scale.
Development along with photoelectric technology, at first the people such as Jianping Yao of Canada University of Ottawa have proposed the concept of optical-electronic oscillator (referring to X.S.Yao and L.Maleki, " Optoelectronic microwave oscillator; " J.Opt.Soc.Amer.B13,1725 – 1735,1996).The general chief component of optical-electronic oscillator comprises: the microwave band-pass filter of a laser, an electrooptic modulator, one section delay device, a photodetector, a microwave amplifier and high Q value.Its operation principle is: the continuous light that the white noise that microwave amplifier produces produces by the electrooptic modulator modulated laser, and the laser after modulation enters photodetector and is converted to the signal of telecommunication through a section single-mould fiber delay line is laggard; 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 frequencies; And the existence due to the microwave band-pass filter of high Q value only has an oscillation mode to remain, and finally realizes high-quality single-mode oscillation.
Although above-mentioned optical-electronic oscillator can produce the microwave signal that high-quality, high frequency expose, its tuning range is subject to the tuning range of electrical filter.In order to overcome this limitation, the researcher has proposed various new optical-electronic oscillator method and structure in the recent period.the people such as Jianping Yao utilize modulator cascade and chirped fiber grating, the phase shift bragg grating has consisted of the adjustable optical-electronic oscillator in broadband, although but its broadband is adjustable, but the super model noise is larger, the impact of microwave frequency Stimulated Light device wave length shift is (referring to B.Yang, X.F.Jin, X.M.Zhang, S.L.Zheng, H.Chi, and Y.Wang, " A wideband frequency-tunable optoelectronic oscillator based on a narrowband phase-shifted FBG and wavelength tuning of laser, " IEEE Photon.Technol.Lett., 24 (1), 73 – 75, 2012).Utilize again afterwards the single response microwave photon filter construction based on wideband light source, realized the tunable of microwave, but owing to being subjected to dispersion carrier wave depression effect, some frequency will be suppressed, can't realize microwave frequency is carried out continuous tuning (referring to M.Li, W.Z.Li, J.P.Yao, " Tunable optoelectronic oscillator incorporating a high-Q spectrum-sliced photonic microwave transversal filter; " IEEE Photon.Technol.Lett., 24 (14), 1251 – 1253,2012).Meanwhile, traditional optical-electronic oscillator adopts electrical filter as the modeling device, and the tuning range of electrical filter is limited, therefore traditional optical-electronic oscillator is difficult to accomplish wide-band tuning.Therefore, adopt the microwave photon signal processing technology, utilizing microwave photon filter to be combined with electrical oscillator will be the development trend of tunable electro-optic oscillator of future generation.
Summary of the invention
The object of the present invention is to provide the adjustable optical-electronic oscillator in a kind of broadband, thereby realize adjustable continuously to optical-electronic oscillator on a large scale.
Technical solution of the present invention is as follows:
a kind of optoelectronic oscillation device of the frequency-tunable based on wide spectrum light source, characteristics are that its formation comprises: wide spectrum light source, optical filter, the first image intensifer, the second image intensifer, the first fiber coupler, the second fiber coupler, the 3rd fiber coupler, the first Polarization Controller, the second Polarization Controller, variable optical delay line, electrooptic modulator, dispersive optical fiber, the first photodetector, the second photodetector, microwave amplifier, the first optical patchcord, the second optical patchcord, the 3rd optical patchcord, the 4th optical patchcord, the 5th optical patchcord, the six fibers wire jumper, the 7th optical patchcord, the 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 the 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, the first output of this first fiber coupler is connected through the input of the 3rd optical patchcord with the first Polarization Controller, the light input end of the described photoelectricity intensity modulator of output termination of the first Polarization Controller, the output of this electrooptic modulator connects the first input end of the second fiber coupler through the six fibers wire jumper,
The second output of described the first fiber coupler is connected with the input of the second Polarization Controller by the 4th optical patchcord, the input of the described tunable optical delay line of output termination of this second Polarization Controller, the output of this tunable optical delay line is connected with the second input of described the second fiber coupler through the 5th section optical patchcord;
The described dispersive optical fiber of output termination of described the second fiber coupler, the input of described second image intensifer of another termination of this dispersive optical fiber, the output of this second image intensifer connects the input of described the 3rd fiber coupler through the 7th optical patchcord, the first described the first photodetector of output termination of the 3rd fiber coupler, the output of the first photodetector is the microwave signal output of this device;
The input of the second described the second photodetector of output termination of described the 3rd 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 with the electrical input of described electrooptic modulator through the second cable.
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.
The first output of described the 3rd fiber coupler and the output of the second output are than being 73%:23%.
Described the first image intensifer and the second image intensifer are used for amplifying optical signals, and the Insertion Loss of link is reduced, and improve the open-loop gain of photoelectricity link.
Described dispersive optical fiber is high Q value microwave energy-storage device.
The arm structure that described the first 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, will produce sinusoidal shape and cut continuously spectrum.
The first output 73% of described the 3rd fiber coupler and the first commercial photodetector 20 form the output microwave link, to reduce micro-wave coupler or power splitter to encircling reducing of interior microwave power.
Described microwave amplifier is gain device, is used for amplifying the microwave signal of described photodetector output, and the open-loop gain that makes the electro-optical feedback loop is greater than 1.
Described tunable optical delay line is used for the microwave signal that described optical-electronic oscillator produces is carried out continuous tuning.
The present invention has the following advantages:
1, the present invention is based on the optoelectronic oscillation device of the frequency-tunable of wide spectrum light source, utilize a wide spectrum light source, an electrooptic modulator, a tunable optical delay line, a photodetector and two fiber couplers jointly to consist of microwave photon filter, and it is combined with optical-electronic oscillator.Time-delay size by tuning tunable optical delay line can realize the continuous tuning to microwave photon filter, has avoided the carrier wave depression effect, thereby realizes adjustable continuously to optical-electronic oscillator on a large scale.
2, the present invention, utilize optical modulator that wide spectrum light source is modulated, utilize dispersion to the continuous conversion of modulation system-intensity modulated and phase-modulation, the hydro-electric cutting method of equivalence is realized the cutting to the wide range source, produce sinusoidal continuous light carrier wave, thereby realize the microwave photon filter of single response, the carrier wave depression effect of having avoided simultaneously traditional wide range cutting to produce.
3, the present invention has utilized dispersive optical fiber as the microwave energy-storage element, and the microwave signal of output has splendid phase noise characteristic, by changing the tunable optical delay line, realizes the adjustable continuously of microwave frequency.
4, the present invention can carry out the continuous tuning of microwave frequency in very wide scope, and tuning range only is subject to gain and the bandwidth of modulator, photodetector, microwave amplifier.
Description of drawings
Fig. 1 is the structural representation of optoelectronic oscillation device embodiment that the present invention is based on the frequency-tunable of wide spectrum light source.Wherein export the microwave photon filter that has consisted of single response from the wide spectrum light source to the photodetector.
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
Provide a specific embodiment of the present invention below in conjunction with accompanying drawing.The present embodiment is implemented as prerequisite take technical scheme of the present invention, has provided detailed execution mode and process, but protection scope of the present invention should not be limited to following embodiment.
First see also Fig. 1, Fig. 1 is the structural representation of optoelectronic oscillation device embodiment that the present invention is based on the frequency-tunable of wide spectrum light source.The optoelectronic oscillation device that the present invention is based on the frequency-tunable of wide spectrum light source is to adopt wide range source, two fiber couplers, a tunable optical delay line, the microwave photon filter that Dispersive Devices consists of, and realizes the modeling function in optical-electronic oscillator.as seen from the figure, the present invention is based on the optoelectronic oscillation device of the frequency-tunable of wide spectrum light source, its formation comprises: wide spectrum light source 1, optical filter 3, the first image intensifer 4, the second image intensifer 17, the first fiber coupler 6, the second fiber coupler 15, the 3rd fiber coupler 19, the first Polarization Controller 9, the second Polarization Controller 11, variable optical delay line 12, electrooptic modulator 10, dispersive optical fiber 16, the first photodetector 20, the second photodetector 22, microwave amplifier 24, the first optical patchcord 2, the second optical patchcord 5, the 3rd optical patchcord 7, the 4th optical patchcord 8, the 5th optical patchcord 13, six fibers wire jumper 14, the 7th optical patchcord 18, the 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, the 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 described photoelectricity intensity modulator 10 of 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,
The 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 described tunable optical delay line 12 of output termination of this second Polarization Controller 11, the output of this tunable optical delay line 12 is connected with the second input of described the second fiber coupler 15 through the 5th section optical patchcord 13;
One end of the described dispersive optical fiber 16 of output termination of described the second fiber coupler 15, the input of described second image intensifer 17 of another termination of this dispersive optical fiber 16, the output of this second image intensifer 17 connects the input of described the 3rd fiber coupler 19 through the 7th optical patchcord 18, the output 21 of the first described the first photodetector 20, the first photodetectors 20 of output termination of the 3rd fiber coupler 19 is the microwave signal output of this device;
The input of the second described the second photodetector 22 of output termination of described the 3rd 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 with the electrical input of described electrooptic modulator 10 through the second cable 25.
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.The 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, its output connects the 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 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 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, after 16 dispersions of signal process dispersive optical fiber, amplify through the second fiber amplifier EDFA17; EDFA17 output is connected through the input of six fibers wire jumper 18 with the 3rd 27:73 fiber coupler 19; One of output of the 3rd coupler 19 (27%) connects the second commercial photodetector 22, the second output ports (73%) and connects on the first commercial photodetector 20; The signal of telecommunication through detector 22 conversions 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:
At first, wide spectrum light source 1 cuts out the spectrum of certain width as carrier wave through optical filter 3, be input to the light input end of electrooptic modulator, modulated through the RF of electrooptic modulator 10 end by the output noise of microwave amplifier 24, signal after modulation is with together with the carrier wave of variable optical delay line 12, through entering dispersion compensating fiber after coupler 15 couplings, entering EDFA17 after dispersion postpones amplifies again, be converted to the signal of telecommunication finally by photodetector 22, after amplifying 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 value oscillation mode of a series of frequencies in above-mentioned electro-optical feedback loop, and phase noise is splendid.
export in order to select a formation single-mode oscillation from these high Q value oscillation modes, the present invention utilizes a low-cost broadband light source, an electrooptic modulator, and two fiber couplers and dispersive optical fiber, the single order sideband that arm two is produced by the nonlinear effect of electrooptic modulator and the carrier wave of arm one are due to dispersion interaction, survey through photodetector, intensity modulated and phase modulation method constantly change, form sinusoid and cut continuously spectrum, consisted of arrowband list response microwave photon transversal filter, and by changing the amount of delay of arm one, thereby change the interval between adjacent sinusoidal spectrum, namely change the centre frequency of this microwave photon filter.This filter can overcome the tradition carrier wave depression effect that cutting produces based on wide range, with the output of the electric amplifier input as electrooptic modulator, form closed loop, namely formed optical-electronic oscillator, above-mentioned microwave photon filter has replaced traditional microwave filter.This microwave photon filter can be selected single-mode from numerous oscillation modes, realize the single-mode output of optical-electronic oscillator.The modeling operation principle of microwave photon filter as shown in Figure 2.
Fig. 2 has represented the tap coefficient of microwave photon filter.Entering photo detector signal is comprised of two parts, a part is produced by the single order sideband beat frequency of arm 2 carrier waves and the arm 2 non-linear generations of electrooptic modulator, this part has consisted of low pass effect filter, as adopt phase-modulator, because two single order side band phases are opposite, beat frequency only produces direct current, therefore can remove lowpass response; Another part is comprised of the single order sideband of arm 1 carrier wave and arm 2, this part is the same based on single response microwave photon filter of wide range source cutting with tradition, due to the continuous light sampling cutting spectrum that is sinusoidal pattern, corresponding frequency domain is the band pass filter of single response, thereby has realized single response microwave photon filter.Simultaneously, the sampling cutting spectrum of this sinusoidal pattern, come from the dispersion of Dispersive Devices to the intensity modulated mode of modulation signal transmission and constantly alternately changing of phase modulation method, can avoid the carrier wave depression effect of traditional double sideband intensity modulated, thereby avoided filter in some frequency disappearance.When this filter connected microwave amplifier formation closed loop, when forming a large amount of equally spaced oscillation modes in ring, microwave photon filter began to realize modeling, thereby formed single-mode output.And the total dispersion of the centre frequency of microwave photon filter and the ring internal dispersion device relation that is inversely proportional to, with the linear proportional relation of the amount of delay of tunable optical delay line.
Therefore by regulating variable optical delay line, can produce a band pass filter of adjustable wide-band microwave list response on a large scale.As Fig. 3.Change the delay of variable optical delay line by change, just can carry out the oscillation mode of optical-electronic oscillator tuningly, tuning compensation equals the mode frequencey interval that dispersion compensating fiber is introduced.
Fig. 4 is the microwave of optical-electronic oscillator generation for this reason, affected by device, temporarily can reach 7GHz nearly.Fig. 5 is the time-delay the relationship between quantities of optical-electronic oscillator frequency of oscillation and tunable optical delay line for this reason.
Claims (8)
1. optoelectronic oscillation device based on the frequency-tunable of wide spectrum light source, feature is that its formation comprises: wide spectrum light source (1), optical filter (3), the first image intensifer (4), the second image intensifer (17), the first fiber coupler (6), the second fiber coupler (15), the 3rd fiber coupler (19), the first Polarization Controller (9), the second Polarization Controller (10), variable optical delay line (12), electrooptic modulator (11), dispersive optical fiber (16), the first photodetector (20), the second photodetector (22), microwave amplifier (24), the first optical patchcord (2), the second optical patchcord (5), the 3rd optical patchcord (7), the 4th optical patchcord (8), the 5th optical patchcord (13), six fibers wire jumper (14), the 7th optical patchcord (18), the 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), the 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 described photoelectricity intensity modulator of the output termination of the first Polarization Controller (9) (10), the output of this electrooptic modulator (10) connects the first input end of the second fiber coupler (15) through six fibers wire jumper (14),
The 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 described tunable optical delay line of the output termination of this second Polarization Controller (11) (12), the output of this tunable optical delay line (12) is connected through second input of the 5th optical patchcord (13) with described the second fiber coupler (15);
The described dispersive optical fiber of output termination (16) of described the second fiber coupler (15), the input of described the second image intensifer of another termination of this dispersive optical fiber (16) (17), the output of this second image intensifer (17) connects the input of described the 3rd fiber coupler (19) through the 7th optical patchcord (18), the first output described the first photodetector of termination (20) of the 3rd fiber coupler (19), the output (21) of the first photodetector (20) is the microwave signal output of this device;
The input of the second output described the second photodetector of termination (22) of described the 3rd 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 optoelectronic 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 optoelectronic 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 optoelectronic 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 optoelectronic oscillation device of the frequency-tunable based on wide spectrum light source according to claim 1, 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 optoelectronic oscillation device of the frequency-tunable based on wide spectrum light source according to claim 1, it is characterized in that, described 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.
7. the optoelectronic 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 optoelectronic oscillation device of the described frequency-tunable based on wide spectrum light source of according to claim 1 to 7 any one, is characterized in that, the first output of described the 3rd fiber coupler (19) and the output of the second output are than being 73%:23%.
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