CN204067835U - A kind of optical-electronic oscillator based on three fiber optic loop structures - Google Patents
A kind of optical-electronic oscillator based on three fiber optic loop structures Download PDFInfo
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Abstract
A kind of optical-electronic oscillator based on three fiber optic loop structures, comprise light source, electrooptic modulator, amplifier, band pass filter, the first optical splitter, the first fiber optic loop, the second fiber optic loop, the 3rd fiber optic loop, the first photo-detector, the second photo-detector, the 3rd photo-detector, the first power splitter, the second power splitter, the first fiber optic loop, the second fiber optic loop, the 3rd fiber optic loop length are different; Optical-electronic oscillator based on three fiber optic loop structures of the present utility model has the advantages such as spectral purity is high, operating frequency is high, anti-electromagnetic interference capability is strong.
Description
Technical field
The utility model relates to optoelectronic information field, and particularly relating to a kind ofly provides the microwave source of microwave signal for radar system.
Background technology
Along with the extensive use of modern optoelectronic information technology in the fields such as Aero-Space, radar communication, apparatus measures, electronic countermeasures with develop rapidly, more and more higher requirement is proposed to the frequency stability of microwave signal source and spectral purity, microwave electrical oscillator is used to produce compared with microwave signal with tradition, optical-electronic oscillator utilize electrooptic modulator and optical fiber low-loss characteristic light signal is converted to frequency stabilization, high spectral purity, the microwave signal of low phase noise, be a kind of new technology being generated microwave signal completely by light signal.Optical-electronic oscillator is primarily of compositions such as light source, electrooptic modulator, photodetector, RF amplifier, filters, and the common structure of optical-electronic oscillator has single fiber ring structure and dual fiber ring structure.
Figure 1 shows that the optical-electronic oscillator principle schematic based on single fiber ring structure, the continuous light that low noise laser sends enters photodetector by long optical fibers transmission after electrooptic modulator modulation, photodetector changes the signal of telecommunication into light signal, frequency-selective filtering is carried out afterwards by band pass filter, carry out signal amplification by amplifier, the signal feedback after amplification to electrooptic modulator, thus forms positive feedback loop, realize self-injection locking, form self-excitation stable oscillation stationary vibration.Amplifier in oscillating loop provides signal gain, and signal is after repeatedly circulation amplify, and just can set up stable vibration, its frequency of oscillation is determined by the pass-band performance of light source, fiber lengths and band pass filter.The microwave signal V that optical-electronic oscillator exports
outt () can be expressed as:
From formula (1), output signal comprises the harmonic component of a lot of ω, V
bfor the bias voltage of modulator, V
πfor half-wave voltage, V
0for the amplitude constant of output voltage, J is Bessel function.
Figure 2 shows that the output signal spectrum schematic diagram of the optical-electronic oscillator based on single fiber ring structure, c/nL is spaced apart between different frequency signals, the refractive index that c is the light velocity, n is optical fiber, L are fiber lengths, for adopting a kind of pattern of the optical-electronic oscillator existence anduniquess of single fiber ring structure to export, and signal frequency interval is determined by c/nL.The frequency signal that needs can be selected by the enough narrow band pass filter of dedicated bandwidth in theory, but in fact the bandwidth of band pass filter can not be accomplished very little, the bandwidth of band pass filter is doubly a lot of apart from c/nL of intermode often, cause the output signal cannot selecting single-frequency.The optical-electronic oscillator of single fiber ring structure is adopted not have practical value.
Figure 3 shows that the optical-electronic oscillator principle schematic based on dual fiber ring structure, the light signal that electrooptic modulator exports is divided into three tunnels through optical splitter, one tunnel exports as modulated light signal, two-way gives detector through the fiber optic loop L1 of different length and L2 in addition, the rf signal of two detector outputs is merged into a road rf signal through power splitter and is formed positive feedback through follow up amplifier, filter again, drives electrooptic modulator work.Because fiber optic loop L1 is not identical with the length of L2, the frequency interval determining output signal is not identical, only have meet the frequency signal of two kinds of oscillation modes simultaneously could as final output signal.
Figure 4 shows that the optical-electronic oscillator output signal schematic diagram based on dual fiber ring structure, by the length of appropriate design fiber optic loop L1 and L2, make the trough of the 1st, the 2nd of short fiber the crest just in time corresponding long optical fibers ring that vibrates, the limit mould outputed signal like this obtains good suppression.Adopt dual fiber ring structural rate to adopt the optical-electronic oscillator of single fiber structure to have better spectral purity, but the design of dual fiber ring is difficult to the problem simultaneously taking into account phase noise and Side mode suppressing.In addition, because the refractive index of optical fiber can change along with the change of the environmental factor such as ambient temperature, vibration, optical-electronic oscillator is made to output signal the phenomenon that there is frequency drift, even frequency hopping.
Utility model content
The purpose of this utility model is to provide a kind of optical-electronic oscillator based on three fiber optic loop structures, for solving the problems of the technologies described above.
The utility model is based on the optical-electronic oscillator of three fiber optic loop structures, comprise light source, electrooptic modulator, amplifier, band pass filter, the first optical splitter, the first fiber optic loop, the second fiber optic loop, the 3rd fiber optic loop, the first photo-detector, the second photo-detector, the 3rd photo-detector, the first power splitter, the second power splitter, the first fiber optic loop, the second fiber optic loop, the 3rd fiber optic loop length are different;
Light source output optical signal is to the first input end of electrooptic modulator, the output of electrooptic modulator connects the input of the first optical splitter, three output ports of the first optical splitter connect the first fiber optic loop respectively successively, second fiber optic loop, the input of the 3rd fiber optic loop, the output of the first fiber optic loop connects the input of the first photo-detector, the output of the second fiber optic loop connects the input of the second photo-detector, the output of the 3rd fiber optic loop connects the 3rd photo-detector input, the output of the first photo-detector connects the first input end of the first power splitter, the output of the second photo-detector connects the second input of the first power splitter, the output of the 3rd photo-detector connects the 3rd input of the first power splitter, the output of the first power splitter connects the input of amplifier, the input of the output connecting band bandpass filter of amplifier, the output of band pass filter connects the input of the second power splitter, first output of the second power splitter connects RF driver, the output of RF driver connects the second input of electrooptic modulator, and the second output of the second power splitter exports echo signal.
The utility model is based on the optical-electronic oscillator of three fiber optic loop structures, also comprise, phase-locked loop, frequency controller, external reference frequency, the first input end of the output rate of connections controller of the first power splitter, the output of frequency controller connects the input of amplifier, 3rd output of the second power splitter connects the first input end of phase-locked loop, the second input of external reference frequency access phase-locked loop, the second input of the output rate of connections controller of phase-locked loop.
Described light source adopts active mode locking laser, and described active mode locking laser comprises the first photoisolator, the second photoisolator, Erbium-Doped Fiber Amplifier, wavelength division multiplexer, Pump light source, the second optical splitter, Fabry Perot filter, electrooptic modulator;
First photoisolator, Erbium-Doped Fiber Amplifier, wavelength division multiplexer, second photoisolator, second optical splitter, Fabry Perot filter, electrooptic modulator, clockwise direction sequential series forms closed-loop path successively, Pump light source connects the signal input part of wavelength division multiplexer, the output of Fabry Perot filter connects the first input end of electrooptic modulator, the output of RF driver connects the second input of electrooptic modulator, the output of the second photoisolator connects the input of the second optical splitter, first output of the second optical splitter connects the input of Fabry-pool sieve filter, second output of the second optical splitter connects the input of the first optical splitter.
Be provided with the first polarization beat length device between the output of described electrooptic modulator and the input of the first photoisolator, between the output of Fabry Perot filter and the first input end of electrooptic modulator, be provided with the second polarization beat length device.
Second photoisolator reflects for reducing the light of the second optical splitter, reduces due to the impact of light reflection on electrooptic modulator performance.
Described first polarization beat length device regulates the polarization state of electrooptic modulator output optical signal;
Second polarization beat length device reduces input optical signal polarization state to the impact of electrooptic modulator performance.
The utility model realizes 10GHz circuit and radio circuit design by adopting active mode locking laser technique, Phase Lock Technique and electric light Integral design technology, finally develops the New-generation microwave source that phase noise is low, frequency stability is high, volume is little.Achieved the suppression of output mode by the careful design of three fiber optic loop based on the optical-electronic oscillator of phase-locked loop and three fiber optic loop structures, PHASE-LOCKED LOOP PLL TECHNIQUE is utilized to realize PGC demodulation, adopt active mode locking laser technique not only can improve the frequency stability of output signal, and can reduced volume.The utility model has the advantages such as spectral purity is high, operating frequency is high, anti-electromagnetic interference capability is strong, is highly suitable for X-band radar, promotes resolution and the detection accuracy of radar.
Below in conjunction with accompanying drawing, the optical-electronic oscillator based on three fiber optic loop structures of the present utility model is described further.
Accompanying drawing explanation
Fig. 1 is the optical-electronic oscillator principle schematic based on single fiber ring structure;
Fig. 2 is the output signal spectrum schematic diagram of the optical-electronic oscillator based on single fiber ring structure;
Fig. 3 is the optical-electronic oscillator principle schematic based on dual fiber ring structure;
Fig. 4 is the optical-electronic oscillator output signal schematic diagram based on dual fiber ring structure;
Fig. 5 is the optical-electronic oscillator principle schematic based on three fiber optic loop structures;
Fig. 6 is principle of phase lock loop schematic diagram;
Fig. 7 is active mode locking laser principle schematic.
Embodiment
As shown in Figure 5, the optical-electronic oscillator based on three fiber optic loop structures comprises light source 1, electrooptic modulator 2, first optical splitter 3, first fiber optic loop L1, the second fiber optic loop L2, the 3rd fiber optic loop L3, the first photo-detector PD1, the second photo-detector PD2, the 3rd photo-detector PD3, the first power splitter GF1, amplifier 5, band pass filter 6, second power splitter GF2, phase-locked loop 8, external reference frequency 7, frequency controller 9;
Light source 1 output optical signal is to the first input end of electrooptic modulator 2, the output of electrooptic modulator 2 connects the input of the first optical splitter 3, three output ports of the first optical splitter 3 meet the first fiber optic loop L1 respectively successively, second fiber optic loop L2, the input of the 3rd fiber optic loop L3, the output of the first fiber optic loop L1 connects the input of the first photo-detector PD1, the output of the second fiber optic loop L2 connects the input of the second photo-detector PD2, the output of the 3rd fiber optic loop L3 connects the 3rd photo-detector PD3 input, the output of the first photo-detector PD1 connects the first input end of the first power splitter GF1, the output of the second photo-detector PD2 connects second input of the first power splitter GF1, the output of the 3rd photo-detector PD3 connects the 3rd input of the first power splitter GF1, the first input end of the output rate of connections controller 9 of the first power splitter GF1, the output of frequency controller 9 connects the input of amplifier 5, the input of the output connecting band bandpass filter 6 of amplifier 5, the output of band pass filter 6 connects the input of the second power splitter GF2, first output of the second power splitter GF2 connects RF driver 4, the output of RF driver 4 connects the second input of electrooptic modulator 2, second output of the second power splitter GF2 exports echo signal, 3rd output of the second power splitter GF2 connects the first input end of phase-locked loop 8, external reference frequency 7 accesses the second input of phase-locked loop 8, second input of the output rate of connections controller 9 of phase-locked loop 8.
The laser of electrooptic modulator 2 for being produced to light source 1 by rf-signal modulation by light source 1, is formed the laser modulation signal being loaded with radiofrequency signal information, and laser modulation signal is flowed to the first optical splitter 3;
First optical splitter 3 will receive the laser modulation signal one dividing into three of coming, input three tunnel first fiber optic loop L1, the second fiber optic loop L2, the 3rd fiber optic loop L3 respectively, the length of three fiber optic loop is different, respectively different time delays is formed to three road laser modulation signals, make, through three identical road laser modulation signals of the frequency of three fiber optic loop, to change into each unequal laser modulation signal of frequency;
Laser modulation signal is flowed to the first photo-detector PD1 by the first fiber optic loop L1, and the laser modulation signal of reception is changed into radiofrequency signal by the first photo-detector PD1; Laser modulation signal is flowed to the second photo-detector PD2 by the second fiber optic loop L2, and the laser modulation signal of reception is changed into radiofrequency signal by the second photo-detector PD2; Laser modulation signal is flowed to the 3rd photo-detector PD3 by the 3rd fiber optic loop L3, and the laser modulation signal of reception is changed into rf signal by the 3rd photo-detector PD3;
First fiber optic loop L1, the second fiber optic loop L2, the 3rd fiber optic loop L3 length difference, different time delays is produced to laser modulation signal, thus make the laser modulation signal exported from three fiber optic loop have different intermode distances, the signal of different intermode distance can suppress unwanted frequency signal, thus plays the effect suppressing limit mould signal;
The three tunnel radiofrequency signals that three photo-detectors export by the first power splitter GF1 synthesize a road radiofrequency signal, and this road radiofrequency signal is exported to frequency controller 9;
Frequency controller 9 carries out mixing, computing, control the stable signal of final output frequency for the signal that the signal that exported by phase-locked loop 8 and the first power splitter GF1 export, and reaches the stable effect exporting radiofrequency signal.Amplifier 5 flows to band pass filter 6, the attenuation in compensating signal transmitting procedure after amplifying for the signal exported by frequency controller again; Band pass filter 6 is for leaching echo signal and flowing to the second power splitter GF2; Second power splitter GF2, by echo signal one dividing into three, sends from three outputs respectively; Phase-locked loop 8 is for receiving the signal of the 3rd output feedback of the second amplifirer GF2, and result is fed back to frequency controller 9, phase-locked loop 8 and the second power splitter GF2 and frequency controller 9 be connected to form negative feedback loop, adjust according to the output signal of feedback information to frequency controller 9 of the second power splitter GF2 in real time.
As shown in Figure 5, light source 1 sends the laser of low noise and has given electrooptic modulator 2 as modulated light signal, radiofrequency signal is modulated by laser by electrooptic modulator 2, after modulation, electrooptic modulator 2 exports the laser modulation signal being loaded with radiofrequency signal information, this laser modulation signal is divided into three road laser modulation signals by optical splitter 3, input the first fiber optic loop L1 respectively, second fiber optic loop L2, 3rd fiber optic loop L3, three road laser modulation signals are respectively through the first fiber optic loop L1 of different length, second fiber optic loop L2, the laser modulation signal that three tunnel frequencies are different is exported after 3rd fiber optic loop L3 different delayed time, first photo-detector PD1, second photo-detector PD2, three road ray laser modulation signals are converted to three road rf signals by the 3rd photo-detector PD3 respectively, and input three inputs of the first power splitter GF1 respectively, the three road rf signals that three detectors are carried by the first power splitter GF1 merge into a road rf signal, amplifier 5 radio frequency signal amplifies, band pass filter 6 is flowed to after compensating the loss of rf signal in transmitting procedure, the electrical signal of the frequency (i.e. echo signal) of needs chosen by band pass filter 6, the filtering unwanted frequency signal of telecommunication, the rf signal that band pass filter exports is divided into three tunnels by the second power splitter GF2, and electrooptic modulator 2 is given on a road, and phase-locked loop 8 is given on a road, also has a road as output signal.
The acting in conjunction of phase-locked loop 8 and frequency controller 9 is stabilization signal frequencies, play the phase-locked effect of frequency stabilization when extraneous factor disturbance causes output frequency that drift occurs by phase-locked loop 8 and frequency controller 9, the reference frequency of outside 100MHz as frequency reference for phase-locked loop provides the reference frequency of Low phase noise.
Phase-locked loop comprises phase discriminator 11, loop filter 12, voltage controlled oscillator 13, frequency divider 14 as shown in Figure 6, external reference frequency 7 inputs the first input end of phase discriminator 11, the input of the output linkloop filter 12 of phase discriminator 11, the output of loop filter 12 connects the input of voltage controlled oscillator 13, the output of voltage controlled oscillator 13 connects the input of frequency divider 14, and the output of frequency divider 14 connects the second input of phase discriminator 11;
Phase discriminator 11 is used for differentiating input signal f
iwith output signal f
obetween phase difference, and change phase signal into voltage U
d; Loop filter 12 is used for filtering U
din Noise and Interference composition, U
cact on voltage controlled oscillator 13; Voltage controlled oscillator 13 is for being converted to frequency signal by voltage signal.
When the change of outside environmental elements makes the frequency f that outputs signal
owhen becoming large, as follows by phase-locked loop 8 adjustment process: f
o↑ → U
d↓ → U
c↓ → f
o↓, when the change of outside environmental elements makes frequency f
owhen diminishing, adjustment process is as follows: f
o↓ → U
d↑ → U
c↑ → f
o↑.Common optical-electronic oscillator is when there is conversion in outside environmental elements, and the frequency of output signal can be drifted about, and makes optical-electronic oscillator be provided with the function of automatic frequency regulable control, thus realize the object of frequency stabilization by phase-locked loop.
If laser modulation signal is respectively τ by the time of delay of the first fiber optic loop L1, the second fiber optic loop L2, the 3rd fiber optic loop L3
1, τ
2, τ
3, optical-electronic oscillator produces the frequency f of signal
0can be expressed as:
In above formula, m, n, l are positive integer, because fiber optic loop length is different, the oscillation mode caused is different, the frequency interval of each pattern is respectively the inverse of time of delay, in the optical-electronic oscillator based on three fiber optic loop structures, the frequency of oscillation producing signal is determined jointly by three fiber optic loop, and therefore frequency of oscillation is the integral multiple of three fiber optic loop frequency intervals.When the frequency of oscillation of three fiber optic loop is just in time equal, the frequency of oscillation based on the optical-electronic oscillator of three fiber optic loop structures is exactly the frequency of output signal.According to the transmission characteristic of optical fiber, 1km optical fiber delay time τ is about 5 μ s, frequency of oscillation is spaced apart Δ f=1/ τ, namely the frequency interval that 1km optical fiber produces is 200KHz, as the first fiber optic loop L1, second fiber optic loop L2, the length of the 3rd fiber optic loop L3 is respectively 4.4km, 3km, 1.2km time, first fiber optic loop L1, second fiber optic loop L2, the frequency interval that 3rd fiber optic loop L3 is corresponding is respectively more 45kHz, 66kHz, 166kHz, only have and meet 45kHz simultaneously, 66kHz, vibration could be there is and as final output signal (therefore can choose the length of different fiber optic loop according to the frequency of echo signal) in the signal of 166kHz integral multiple.First limit mould for 10GHz oscillator signal appears at about 10GHz ± 82MHz frequency place, and the filter bandwidht of use is 2MHz and 10GHz ± 1MHz, is enough to suppress limit mould signal, reduces noise.
In preferred above-described embodiment, the dotted box portion in Fig. 1 adopts active mode locking laser;
Active mode locking laser comprises the first photoisolator ISO1, the second photoisolator ISO2, Erbium-Doped Fiber Amplifier EDFA, wavelength division multiplexer WDM, Pump light source, the second optical splitter 10, Fabry Perot filter F-P, the first polarization beat length device PC1, the second polarization beat length device PC2, electrooptic modulator 2 as shown in Figure 7;
First photoisolator ISO1, Erbium-Doped Fiber Amplifier EDFA, wavelength division multiplexer WDM, second photoisolator ISO2, second optical splitter 10, Fabry Perot filter F-P, second polarization beat length device PC2, electrooptic modulator 2, first polarization beat length device PC1 successively clockwise direction sequential series forms closed-loop path, Pump light source connects the signal input part of wavelength division multiplexer WDM, the output of the second polarization beat length device PC2 connects the first input end of electrooptic modulator 2, the output of RF driver 4 connects the second input of electrooptic modulator 2, the output of the second photoisolator ISO2 connects the input of the second optical splitter 10, first output of the second optical splitter 10 connects the input of Fabry-pool sieve filter F-P, second output of the second optical splitter 10 connects the input of the first optical splitter 3,
First photoisolator ISO1 is for guaranteeing that the laser of the 1550nm produced through Erbium-Doped Fiber Amplifier EDFA pumping excitation can only along a direction transmission;
Second photoisolator ISO2 reflects for reducing the light of the second optical splitter 10, reduces due to the impact of light reflection on electrooptic modulator 2 performance;
Erbium-Doped Fiber Amplifier EDFA is used for amplifying optical signals, guarantees there are enough luminous powers;
The laser that wavelength division multiplexer WDM is used for laser and the Erbium-Doped Fiber Amplifier EDFA pumping excitation generation sent by Pump light source carries out multiplexing;
Pump light source provides 980nm exciting light signal as exciting light source;
Light signal is divided into two-way by the second optical splitter 10, and electrooptic modulator 2 is given through Fabry Perot filter F-P in a road, another road as output optical signal for user;
Fabry Perot filter F-P, for selecting the laser determining centre wavelength, obtains the laser signal of narrow general line width;
First polarization beat length device PC1 regulates the polarization state of electrooptic modulator 2 output optical signal;
Second polarization beat length device PC2 reduces input optical signal polarization state to the impact of electrooptic modulator 2 performance;
Electrooptic modulator 2 is modulated for the radiofrequency signal exported by RF driver 4, produces mode locking pulse light signal.
The 980nm laser that Pump light source sends produces the laser of 1550nm and amplifies after Erbium-Doped Fiber Amplifier EDFA pumping excitation, because the first photoisolator ISO1 has one-way, 1550nm laser can only transmit along clockwise direction, the laser sent through wavelength division multiplexer WDM and Pump light source carry out multiplexing after be transmitted to the second photoisolator ISO2, import the second optical splitter 10 afterwards into, after the second optical splitter 10 light splitting, wherein a road light move on through Fabry Perot filter F-P filtering select after give electrooptic modulator 2, electrooptic modulator 2 completes radiofrequency signal that RF driver exports and enters the multiplexed laser signal madulation transported through Fabry Perot filter F-P and obtain mode locking pulse light signal, afterwards mode locking pulse light signal is flowed to the first photoisolator ISO1,
Preferably, because electrooptic modulator 2 pairs of polarization states are more responsive, need to carry out polarization beat length, the input/output terminal of electrooptic modulator 2 is respectively arranged with the first polarization beat length device PC1, the second polarization beat length device PC2, and the drive singal of electrooptic modulator 2 is from RF driver.
The use of active mode locking laser obtains the high laser of frequency stability on the one hand; The spectral line of laser can be accomplished very little on the other hand, has the stability being used in raising system.
Above-described embodiment is only be described preferred implementation of the present utility model; not scope of the present utility model is limited; under the prerequisite not departing from the utility model design spirit; the various distortion that those of ordinary skill in the art make the technical solution of the utility model and improvement, all should fall in protection range that the utility model claims determine.
Claims (5)
1. the optical-electronic oscillator based on three fiber optic loop structures, comprise light source (1), electrooptic modulator (2), amplifier (5), band pass filter (6), it is characterized in that, also comprise the first optical splitter (3), first fiber optic loop (L1), second fiber optic loop (L2), 3rd fiber optic loop (L3), first photo-detector (PD1), second photo-detector (PD2), 3rd photo-detector (PD3), first power splitter (GF1), second power splitter (GF2), first fiber optic loop (L1), second fiber optic loop (L2), 3rd fiber optic loop (L3) length is different,
Light source (1) output optical signal is to the first input end of electrooptic modulator (2), the output of electrooptic modulator (2) connects the input of the first optical splitter (3), three output ports of the first optical splitter (3) connect the first fiber optic loop (L1) respectively successively, second fiber optic loop (L2), the input of the 3rd fiber optic loop (L3), the output of the first fiber optic loop (L1) connects the input of the first photo-detector (PD1), the output of the second fiber optic loop (L2) connects the input of the second photo-detector (PD2), the output of the 3rd fiber optic loop (L3) connects the 3rd photo-detector (PD3) input, the output of the first photo-detector (PD1) connects the first input end of the first power splitter (GF1), the output of the second photo-detector (PD2) connects the second input of the first power splitter (GF1), the output of the 3rd photo-detector (PD3) connects the 3rd input of the first power splitter (GF1), the output of the first power splitter (GF1) connects the input of amplifier (5), the input of the output connecting band bandpass filter (6) of amplifier (5), the output of band pass filter (6) connects the input of the second power splitter (GF2), first output of the second power splitter (GF2) connects RF driver (4), the output of RF driver (4) connects the second input of electrooptic modulator (2), and the second output of the second power splitter (GF2) exports echo signal.
2. the optical-electronic oscillator based on three fiber optic loop structures according to claim 1, it is characterized in that, also comprise, phase-locked loop (8), frequency controller (9), external reference frequency (7), the first input end of the output rate of connections controller (9) of the first power splitter (GF1), the output of frequency controller (9) connects the input of amplifier (5), 3rd output of the second power splitter (GF2) connects the first input end of phase-locked loop (8), second input of external reference frequency (7) access phase-locked loop (8), second input of the output rate of connections controller (9) of phase-locked loop (8).
3. the optical-electronic oscillator based on three fiber optic loop structures according to claim 1 and 2, it is characterized in that, described light source (1) adopts active mode locking laser, and described active mode locking laser comprises the first photoisolator (ISO1), the second photoisolator (ISO2), Erbium-Doped Fiber Amplifier (EDFA), wavelength division multiplexer (WDM), Pump light source, the second optical splitter (10), Fabry Perot filter (F-P), electrooptic modulator (2);
First photoisolator (ISO1), Erbium-Doped Fiber Amplifier (EDFA), wavelength division multiplexer (WDM), second photoisolator (ISO2), second optical splitter (10), Fabry Perot filter (F-P), electrooptic modulator (2) successively clockwise direction sequential series forms closed-loop path, Pump light source connects the signal input part of wavelength division multiplexer (WDM), the output of Fabry-pool sieve filter (F-P) connects the first input end of electrooptic modulator (2), the output of RF driver (4) connects the second input of electrooptic modulator (2), the output of the second photoisolator (ISO2) connects the input of the second optical splitter (10), first output of the second optical splitter (10) connects the input of Fabry-pool sieve filter (F-P), second output of the second optical splitter (10) connects the input of the first optical splitter (3).
4. the optical-electronic oscillator based on three fiber optic loop structures according to claim 3, it is characterized in that, be provided with the first polarization beat length device (PC1) between the output of described electrooptic modulator (2) and the input of the first photoisolator (ISO1), between the output of Fabry Perot filter (F-P) and the first input end of electrooptic modulator (2), be provided with the second polarization beat length device (PC2).
5. the optical-electronic oscillator based on three fiber optic loop structures according to claim 4, is characterized in that, described first polarization beat length device (PC1) regulates the polarization state of electrooptic modulator (2) output optical signal;
Second polarization beat length device (PC2) reduces the impact of input optical signal polarization state on electrooptic modulator (2) performance.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104158069A (en) * | 2014-07-21 | 2014-11-19 | 中国电子科技集团公司第八研究所 | Photoelectric oscillator based on three-fiber-loop structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104158069A (en) * | 2014-07-21 | 2014-11-19 | 中国电子科技集团公司第八研究所 | Photoelectric oscillator based on three-fiber-loop structure |
| CN104158069B (en) * | 2014-07-21 | 2017-12-26 | 中国电子科技集团公司第八研究所 | A kind of optical-electronic oscillator based on three optical fiber ring structures |
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