CN204615139U - Optical-electronic oscillator - Google Patents
Optical-electronic oscillator Download PDFInfo
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- CN204615139U CN204615139U CN201520267124.6U CN201520267124U CN204615139U CN 204615139 U CN204615139 U CN 204615139U CN 201520267124 U CN201520267124 U CN 201520267124U CN 204615139 U CN204615139 U CN 204615139U
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Abstract
The utility model discloses a kind of optical-electronic oscillator, comprise the laser for exporting light carrier, laser connects photoelectricity circulation circuit for forming photoelectricity hybrid resonant chamber, and optical-electronic oscillator also comprises the stability contorting module fluctuated with the time delay compensating photoelectricity circulation circuit to photoelectricity circulation circuit with the injection phase-locking module and controlling for pilot tone realizing Side mode suppressing for injection locking signal.The utility model is by arranging injection phase-locking module, injection locking signal realizes Side mode suppressing to photoelectricity circulation circuit, by arranging stability contorting module, fluctuate with the time delay of extracting each device of photoelectricity circulation circuit and carry out corresponding time delay oscillation compensation, to reach the object of stable oscillation stationary vibration frequency, thus the stable output of the Low phase noise single mode achieving optical-electronic oscillator, and to carry out at different frequency range because pilot tone controls to vibrate with the circulation of injection locking semaphore lock, avoid mutual interference, efficiently avoid the ghost effect of control circuit noise to oscillator signal.
Description
Technical field
The utility model relates to field of oscillators, especially, relates to a kind of optical-electronic oscillator.
Background technology
Optical-electronic oscillator (Opto-electronic Oscillator, OEO) be a kind of SAW Oscillators in conjunction with microwave and photon technology, because it has pole Low phase noise at microwave, millimeter wave frequency band and receive higher concern, the field such as radar, electronic warfare, accurately measurement can be widely used in.Compared with traditional microwave oscillator, OEO has the following advantages: 1, have pole Low phase noise, and makes an uproar mutually and do not enlarge markedly with the raising of frequency of oscillation, is the important candidate of microwave and millimeter wave, even THz wave Low phase noise signal source; 2, electricity, light two kinds of input modes can be provided for information system, can be applicable to various electronic system and optical communication, Microwave photonics system; 3, OEO can not only produce oscillator signal, and can realize signal processing function and some functions such as sensing, measurement such as phase-locked, frequency multiplication, is widely used.In sum, OEO has the characteristic that some traditional oscillators cannot match in excellence or beauty, and is one of the important candidate producing pole Low phase noise microwave, millimetre-wave generator, has higher practical value.
The practical current of OEO mainly faces two large problems: one, the Low phase noise realizing OEO must adopt long optical fibers to roll up as time delay, and increase along with the length of optical fiber, mode spacing can along with reducing (for 10GHz frequency of oscillation OEO, the mode spacing of the corresponding 200kHz of 1km optical fiber), cannot narrow band filter be used at microwave frequency band; Its two, composition OEO electrooptic modulator, roll of optical fiber, microwave amplifier etc. be environment sensitive device, the fluctuation of outside environmental elements can cause the drift of frequency of oscillation.Therefore overcome " multimode is also deposited " and " environment sensitive " way to solve the problem while needing that design is a kind of badly and realizing Low phase noise, export to ensure that the single mode Low phase noise of oscillator signal is stable.
Utility model content
The utility model provides a kind of optical-electronic oscillator, there is to solve existing optical-electronic oscillator the technical problem that Low phase noise single-mode output is difficult to the oscillation frequency shifts realizing and cause because of environmental interference.
The technical solution adopted in the utility model is as follows:
A kind of optical-electronic oscillator, comprises the laser for exporting light carrier, and laser connects the photoelectricity circulation circuit for forming photoelectricity hybrid resonant chamber,
Optical-electronic oscillator also comprise for injection locking signal to photoelectricity circulation circuit with realize Side mode suppressing injection phase-locking module and for pilot tone control with compensates photoelectricity circulation circuit time delay fluctuate stability contorting module.
Further, injection phase-locking module comprises the first signal source for generating Injection Signal and for regulating the adjustable attenuator of the signal power of Injection Signal, the output of adjustable attenuator is coupled to photoelectricity circulation circuit.
Further, photoelectricity circulation circuit comprises: the electrooptic modulator connected successively, roll of optical fiber, photodetector, microwave amplifier, voltage-controlled phase shifter, narrow band filter, and the output of narrow band filter connects the electrical input of electrooptic modulator;
The light carrier that laser sends carries out time delay by roll of optical fiber after electrooptic modulator, light signal after time delay is reduced into the signal of telecommunication by photodetector, the signal of telecommunication carries out phase adjusted by voltage-controlled phase shifter again after microwave amplifier amplifies, voltage-controlled phase shifter carries out phase adjusted according to stability contorting module output signal, and the signal of telecommunication after phase adjusted feeds back to electrooptic modulator again and enters and circulate next time after narrow band filter filtering;
The output of adjustable attenuator is coupled on the interface channel of the electrical input of narrow band filter and electrooptic modulator.
Further, stability contorting module comprises secondary signal source for generating pilot reference source, phase shifter, frequency mixer, low pass filter and baseband signal processing module,
The signal that secondary signal source exports is divided into two-way, and lead up to after phase shifter phase shift and export to frequency mixer, electrooptic modulator of separately leading up to enters photoelectricity circulation circuit, and exports frequency mixer to through microwave amplifier;
The output of frequency mixer connects low pass filter, and low pass filter connects baseband signal processing module, and baseband signal processing module generates voltage control signal to the voltage input end of voltage-controlled phase shifter, to compensate the time delay fluctuation of photoelectricity circulation circuit.
Further, the angle of phase shifter to the signal phase shift that secondary signal source exports is 90 degree.
Further, the first signal source adopts dielectric oscillator, and secondary signal source adopts crystal oscillator source.
The utility model has following beneficial effect:
The utility model optical-electronic oscillator, in conjunction with injection phase-locking and pilot tone control technology, by arranging injection phase-locking module, Side mode suppressing is realized to photoelectricity circulation circuit by injection locking signal, ensure that optical-electronic oscillator single mode is stable to export, by arranging stability contorting module, fluctuate with the time delay of extracting each device of photoelectricity circulation circuit and carry out corresponding time delay oscillation compensation, to reach the object of stable oscillation stationary vibration frequency, thus the stable output of the Low phase noise single mode achieving optical-electronic oscillator, and to carry out at different frequency range because pilot tone controls to vibrate with the circulation of injection locking semaphore lock, avoid mutual interference, efficiently avoid the ghost effect of control circuit noise to oscillator signal, moreover, the stability adopting pilot technique to realize OEO controls, also can overcome the restriction that in traditional locks phase control, reference source is made an uproar mutually to the nearly carrier frequency of oscillator signal, ensure the realization of OEO full frequency band Low phase noise performance.
Except object described above, feature and advantage, the utility model also has other object, feature and advantage.Below with reference to figure, the utility model is described in further detail.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide further understanding of the present utility model, and schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the structural representation of the utility model preferred embodiment optical-electronic oscillator;
Fig. 2 is the structural representation of the utility model preferred embodiment photoelectricity circulation circuit;
Fig. 3 is the structural representation of the utility model preferred embodiment injection phase-locking module;
Fig. 4 is the structural representation of the utility model preferred embodiment stability contorting module;
Fig. 5 is another structural representation of the utility model preferred embodiment optical-electronic oscillator;
Fig. 6 is the oscillator signal spectrum diagram of the utility model preferred embodiment optical-electronic oscillator, and wherein, (a) is the spectrum diagram before injection locking signal, (b) is the spectrum diagram after injection locking signal;
Fig. 7 is the output stability schematic diagram of the utility model preferred embodiment optical-electronic oscillator;
Fig. 8 is the index schematic diagram of making an uproar mutually of the utility model preferred embodiment optical-electronic oscillator.
Description of reference numerals:
10, laser;
20, photoelectricity circulation circuit; 21, electrooptic modulator; 22, roll of optical fiber; 23, photodetector; 24, microwave amplifier; 25, voltage-controlled phase shifter; 26, narrow band filter;
30, injection phase-locking module; 31, the first signal source; 32, adjustable attenuator;
40, stability contorting module; 41, secondary signal source; 42, phase shifter; 43, frequency mixer; 44, low pass filter; 45, baseband signal processing module.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail, but the multitude of different ways that the utility model can be defined by the claims and cover is implemented.
The utility model aims to provide the optical-electronic oscillator that a kind of Low phase noise single mode that can realize microwave oscillation signal stablizes output, realize in conjunction with injection phase-locking and pilot tone control technology, particularly, injection phase-locking mode is adopted to realize Side mode suppressing, to ensure single-mode output, pilot tone control technology is adopted to overcome the impact of environment on optical-electronic oscillator, to realize stable output.
With reference to Fig. 1, preferred embodiment of the present utility model provides a kind of optical-electronic oscillator, comprise the laser 10 for exporting light carrier, laser 10 connects the photoelectricity circulation circuit 20 for forming photoelectricity hybrid resonant chamber, optical-electronic oscillator also comprise for injection locking signal to photoelectricity circulation circuit 20 with realize Side mode suppressing injection phase-locking module 30 and for pilot tone control with compensates photoelectricity circulation circuit 20 time delay fluctuate stability contorting module 40.The present embodiment optical-electronic oscillator is in conjunction with injection phase-locking and pilot tone control technology, by arranging injection phase-locking module, Side mode suppressing is realized to photoelectricity circulation circuit by injection locking signal, ensure that optical-electronic oscillator single mode is stable to export, by arranging stability contorting module, fluctuate with the time delay of extracting each device of photoelectricity circulation circuit and carry out corresponding time delay oscillation compensation, to reach the object of stable oscillation stationary vibration frequency, thus the stable output of the Low phase noise single mode achieving optical-electronic oscillator, and to carry out at different frequency range because pilot tone controls to vibrate with the circulation of injection locking semaphore lock, avoid mutual interference, efficiently avoid the ghost effect of control circuit noise to oscillator signal, moreover, the stability adopting pilot technique to realize OEO controls, also can overcome the restriction that in traditional locks phase control, reference source is made an uproar mutually to the nearly carrier frequency of oscillator signal, ensure the realization of OEO full frequency band Low phase noise performance.。
With reference to Fig. 2, in the present embodiment, photoelectricity circulation circuit 20 comprises: the electrooptic modulator 21 connected successively, roll of optical fiber 22, photodetector 23, microwave amplifier 24, voltage-controlled phase shifter 25, narrow band filter 26, and the output of narrow band filter 26 connects the electrical input of electrooptic modulator 21; Laser 10 provides light carrier to be modulated, the light carrier that laser 10 sends carries out time delay by roll of optical fiber 22 after electrooptic modulator 21, light signal after time delay is reduced into the signal of telecommunication by photodetector 23, the signal of telecommunication carries out phase adjusted by voltage-controlled phase shifter 25 again after microwave amplifier 24 amplifies, voltage-controlled phase shifter 25 carries out phase adjusted according to stability contorting module 40 output signal, and the signal of telecommunication after phase adjusted feeds back to electrooptic modulator 21 again and enters and circulate next time after narrow band filter 26 filtering.For some specific frequency signal, if it meets Barkhausen condition (open-loop gain is greater than 1, and phase difference is the integral multiple of 2 π), the signal of this frequency just can realize positive feedback vibration.In order to the Low phase noise realizing oscillation circuit exports, require that ring inner fiber rolls up long enough, and long optical fibers time delay to cause mode spacing very little, spurious mode cannot be suppressed with narrow band filter at microwave frequency band, cause the problem of " multimode output ".
In the present embodiment, adopt injection phase-locking module 30 to be solved the problem of OEO " multimode is also deposited " by the mode of microwave source injection locking, suppress the spurious mode of optical-electronic oscillator.Particularly, with reference to Fig. 3, injection phase-locking module 30 comprises the first signal source 31 for generating Injection Signal and for regulating the adjustable attenuator 32 of the signal power of Injection Signal, in the present embodiment, first signal source 32 adopts dielectric oscillator, inject source frequency consistent with oscillator signal, the output of adjustable attenuator 32 is coupled to photoelectricity circulation circuit 20.In the present embodiment, with reference to Fig. 5, the output of adjustable attenuator 32 is coupled to narrow band filter 26 with on the interface channel of the electrical input of electrooptic modulator 21.Injection Signal is coupled into photoelectricity circulation circuit as with reference to source after adjustable attenuator 32, aims at, completes injection locking, realize, to effective suppression of other pattern, being intended to the single-mode output realizing oscillator signal with certain mode frequency of oscillator signal; Adjustable attenuator 32 for regulating the watt level of the Injection Signal being coupled into photoelectricity circulation circuit 20, this is because suitable injecting power weighs the effective means of making an uproar mutually with spuious.Specifically, for 6km optical fiber OEO, its mode spacing is about 34kHz, so little bandwidth, cannot suppress with narrow band filter at microwave frequency band, the utility model adopts the method for microwave source injection locking, certain pattern frequency of source frequency aligning oscillator signal will be injected, seed signal corresponding to this frequency is made to be greater than other mode signal, along with the increase of cycle-index, this mode signal can get the mastery in " mode competition ", finally realizes effectively suppressing to other spurious mode, realizes single-mode output.
In the present embodiment, alternatively, with reference to Fig. 4, stability contorting module 40 comprises secondary signal source 41 for generating pilot reference source, phase shifter 42, frequency mixer 43, low pass filter 44 and baseband signal processing module 45; Wherein, the signal that secondary signal source 41 exports is divided into two-way, lead up to after phase shifter 42 carries out 90 degree of phase shifts and export to frequency mixer 43, electrooptic modulator 21 of separately leading up to enters photoelectricity circulation circuit 20, electrooptic modulator 21 carries out intensity modulated to this pilot reference source, then through roll of optical fiber 22 time delay, be reduced into the signal of telecommunication through photodetector 23, then frequency mixer 43 is exported to, to carry out mixing phase demodulation with the pilot reference source of another road after 90 degree of phase shifts after microwave amplifier 24 amplifies; Signal after phase demodulation is exported to baseband signal processing module 45 through low pass filter 44 and is processed, the time delay fluctuation information of baseband signal processing module 45 microwave light link the most at last changes the control voltage of voltage-controlled phase shifter 25 into, realize injection source aim at the strict of certain mode frequencey of long ring OEO by change control voltage, regulation loop phase in-migration, to compensate the time delay fluctuation of photoelectricity circulation circuit 20.The structural representation of whole optical-electronic oscillator is with reference to Fig. 5.
Pilot tone control technology is adopted to be described with the stable output controlling oscillator signal to the utility model below:
If two input signals of frequency mixer 43 are:
In formula (1), V
1with V
2be respectively tributary signal after feedback branch phase shift; A
1, A
2be respectively the amplitude of two paths of signals, ω is pilot signal frequencies;
with
be respectively the phase place that two branch roads arrive frequency mixer front end signal;
for the phase fluctuation of OEO loop.
After two tributary signal mixing be:
After suppressing high fdrequency component by low pass filter
be the phase difference of two branch roads, when its value is the odd-multiple of pi/2, above formula abbreviation is
If
above formula continues abbreviation
be the phase demodulation factor, its value is
as can be seen from the above equation, time delay fluctuate cause phase place change be finally converted to voltage signal, feed back to the voltage-controlled phase shifter of OEO, by change loop phase regulate oscillation signal frequency, realize OEO stability control.Generally speaking, electrooptic modulator and photodetector are broadband device, and microwave amplifier is also easy to realize broadband, based on above-mentioned condition, the overall time delay fluctuation of low frequency probe signals to microwave photon link can be adopted to extract.
Further, for the actual effect that the utility model is implemented better is described, physical varification is carried out based on structure shown in Fig. 5.Electrooptic modulator adopts Optilab company model to be the intensity modulator of IM-1550-12-PM, and bandwidth of operation is 12GHz, insertion loss is 4dB; Photodetector adopts Picometrix company model to be the high speed detector of P-40A/HP, and bandwidth of operation is 40GHz, responsiveness is 0.65A/W1550nm; Laser adopts EM4 company model to be the narrow linewidth laser of AA1401-080-P, and live width is 1MHz, power output is 80mW, relative intensity noise is-150dBc/Hz; Roll of optical fiber adopts the Single mode communication optical fiber of Corning company, and loss is 0.2dB/km, length is 6km; Other device all adopts commercial domestic series.
Composition graphs 6 analyzes the Side mode suppressing situation of OEO involved by the utility model.First, form the closed-loop path of OEO, ensure that loop gain is greater than 1, now, the pattern meeting Barkhausen condition in narrow band filter will produce vibration, and the frequency spectrum of oscillator signal is as shown in Fig. 6 (a); Then, commercial dielectric oscillator (frequency of oscillation is 10GHz) is adopted to inject OEO, the control voltage of voltage-controlled phase shifter in adjustable ring, make frequency and the Injection Signal frequency alignment of certain pattern, until complete " injection locking ", finally realize single-mode output, as shown in Fig. 6 (b); Finally, by regulating injecting power, modulator bias voltage etc. to realize optimizing further to making an uproar mutually of oscillator signal.As shown in Figure 6, after microwave injection locking scheme involved by the utility model, the limit mould of oscillator signal obtains obvious suppression, solves " multi-mode coexisting " problem that OEO faces, achieves single-mode output.
Composition graphs 7 analyzes the implementations steady in a long-term of OEO involved by the utility model.In the present embodiment, secondary signal source 41 adopts the commercial crystal oscillator source of 400MHz, i.e. the detectable signal mentioned of the utility model Fig. 5, as the pilot reference source of OEO.This detectable signal is divided into two-way, electrooptic modulator of leading up to enters OEO loop, after electrooptic modulator carries out intensity modulated to light carrier through 6km long optical fibers volume time delay, photodetector output recover, by amplifier amplify after and another road detectable signal realize mixing phase demodulation; Need before another road signal mixing to realize 90 ° of phase shifts by a phase shifter, be intended to the object reaching phase demodulation.After baseband signal after phase demodulation carries out noise suppressed by low pass filter, reach baseband signal processing module, after this module realizes the process such as amplification, adaptation, feed back to voltage-controlled phase shifter in ring, fluctuated by the time delay regulating the control voltage of voltage-controlled phase shifter to come in " indirectly supplementing " ring.As shown in Figure 7, involved by the utility model embodiment, the Allan variance of OEO is about 2.7 × 10 in 1s
-12, be about 6.7 × 10 in 10s
-13, be about 1.9 × 10 in 100s
-13and be low to moderate 8.0 × 10 in 1000s
-14.
Composition graphs 7 analyzes the situation of making an uproar mutually of OEO involved by the utility model.The mode controlled through injection locking and pilot tone solves the problem of " multi-mode coexisting " and " environment sensitive " of OEO, and the OEO phase that the present embodiment relates to makes an uproar index as shown in Figure 8.Side mode suppression ratio is higher than 95dBc; Index of making an uproar mutually is-125dBc/Hz1kHz ,-140dBc/Hz10kHz, achieves the stable output of Low phase noise single mode.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (6)
1. an optical-electronic oscillator, comprises the laser (10) for exporting light carrier, and described laser (10) connects the photoelectricity circulation circuit (20) for forming photoelectricity hybrid resonant chamber, it is characterized in that,
Described optical-electronic oscillator also comprise for injection locking signal to described photoelectricity circulation circuit (20) with realize Side mode suppressing injection phase-locking module (30) and for pilot tone control with compensate described photoelectricity circulation circuit (20) time delay fluctuation stability contorting module (40).
2. optical-electronic oscillator according to claim 1, is characterized in that,
Described injection phase-locking module (30) comprises the first signal source (31) for generating Injection Signal and for regulating the adjustable attenuator (32) of the signal power of described Injection Signal, the output of described adjustable attenuator (32) is coupled to described photoelectricity circulation circuit (20).
3. optical-electronic oscillator according to claim 2, is characterized in that,
Described photoelectricity circulation circuit (20) comprising: the electrooptic modulator (21) connected successively, roll of optical fiber (22), photodetector (23), microwave amplifier (24), voltage-controlled phase shifter (25), narrow band filter (26), and the output of described narrow band filter (26) connects the electrical input of described electrooptic modulator (21);
The light carrier that described laser (10) sends carries out time delay by described roll of optical fiber (22) after described electrooptic modulator (21), light signal after time delay is reduced into the signal of telecommunication by described photodetector (23), the described signal of telecommunication carries out phase adjusted by described voltage-controlled phase shifter (25) again after described microwave amplifier (24) amplifies, described voltage-controlled phase shifter (25) carries out phase adjusted according to described stability contorting module (40) output signal, the signal of telecommunication after phase adjusted feeds back to described electrooptic modulator (21) again and enters and circulate next time after described narrow band filter (26) filtering,
The output of described adjustable attenuator (32) is coupled to described narrow band filter (26) with on the interface channel of the electrical input of described electrooptic modulator (21).
4. optical-electronic oscillator according to claim 3, is characterized in that,
Described stability contorting module (40) comprises secondary signal source (41) for generating pilot reference source, phase shifter (42), frequency mixer (43), low pass filter (44) and baseband signal processing module (45)
The signal that described secondary signal source (41) exports is divided into two-way, lead up to after described phase shifter (42) phase shift and export to described frequency mixer (43), described electrooptic modulator (21) of separately leading up to enters described photoelectricity circulation circuit (20), and exports described frequency mixer (43) to through described microwave amplifier (24);
The output of described frequency mixer (43) connects described low pass filter (44), described low pass filter (44) connects described baseband signal processing module (45), described baseband signal processing module (45) generates voltage control signal to the voltage input end of described voltage-controlled phase shifter (25), to compensate the time delay fluctuation of described photoelectricity circulation circuit (20).
5. optical-electronic oscillator according to claim 4, is characterized in that,
The angle of described phase shifter to the signal phase shift that described secondary signal source (41) exports is 90 degree.
6. optical-electronic oscillator according to claim 4, is characterized in that,
Described first signal source (31) adopts dielectric oscillator, and described secondary signal source (41) adopts crystal oscillator source.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767102A (en) * | 2015-04-29 | 2015-07-08 | 湖南工学院 | Optoelectronic oscillator |
| CN110108345A (en) * | 2019-01-25 | 2019-08-09 | 北京航天计量测试技术研究所 | A kind of microwave cavity for microvibration measuring |
| CN110571628A (en) * | 2019-08-31 | 2019-12-13 | 天津大学 | Frequency-tunable photoelectric oscillator system based on electric gain frequency-selecting cavity |
| CN111147073A (en) * | 2019-12-12 | 2020-05-12 | 北京无线电计量测试研究所 | Novel microwave frequency locking device |
-
2015
- 2015-04-29 CN CN201520267124.6U patent/CN204615139U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767102A (en) * | 2015-04-29 | 2015-07-08 | 湖南工学院 | Optoelectronic oscillator |
| CN104767102B (en) * | 2015-04-29 | 2018-02-27 | 湖南工学院 | Optical-electronic oscillator |
| CN110108345A (en) * | 2019-01-25 | 2019-08-09 | 北京航天计量测试技术研究所 | A kind of microwave cavity for microvibration measuring |
| CN110571628A (en) * | 2019-08-31 | 2019-12-13 | 天津大学 | Frequency-tunable photoelectric oscillator system based on electric gain frequency-selecting cavity |
| CN110571628B (en) * | 2019-08-31 | 2020-09-15 | 天津大学 | Frequency-tunable photoelectric oscillator system based on electric gain frequency-selecting cavity |
| CN111147073A (en) * | 2019-12-12 | 2020-05-12 | 北京无线电计量测试研究所 | Novel microwave frequency locking device |
| CN111147073B (en) * | 2019-12-12 | 2022-05-27 | 北京无线电计量测试研究所 | Microwave frequency locking device |
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