CN102148475B - Photonic-filtering-based optoelectronic oscillator - Google Patents
Photonic-filtering-based optoelectronic oscillator Download PDFInfo
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- CN102148475B CN102148475B CN2011100481008A CN201110048100A CN102148475B CN 102148475 B CN102148475 B CN 102148475B CN 2011100481008 A CN2011100481008 A CN 2011100481008A CN 201110048100 A CN201110048100 A CN 201110048100A CN 102148475 B CN102148475 B CN 102148475B
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Abstract
The invention provides a photonic-filtering-based optoelectronic oscillator, which adopts an amplified feedback laser (AFL) as an optical domain filter instead of a conventional electric domain filter. A longitudinal intermode beat frequency microwave signal of the AFL serves as a drive source of a modulator for modulating laser injected into the AFL to form a self-feedback oscillatory system to further realize high-quality microwave and optical clock output functions.
Description
Technical field
The present invention relates to photoelectricity hybrid technology field, particularly relate to a kind of optical-electronic oscillator based on photon filtering.
Background technology
The high-quality microwave signal is in optical fiber, microwave, satellite communication, radar system, and all there is important application precision instrumentation and high-acruracy survey aspect.The high-quality microwave source of extensive use at present mostly depends on high Q value microwave energy-storage device (like the dielectric resonant chamber oscillator) or SAW device (like quartz oscillator).These two types of devices have good performance at several MHz when several ghz bands are worked.But when the work of X frequency range and even higher frequency, because need be through frequency multiplication repeatedly, the microwave signal quality that these devices produced is rapid deterioration along with the increase of frequency.The appearance of optical-electronic oscillator (Optoelectronic Oscillator is hereinafter to be referred as OEO) efficiently solves this problem.The photoelectricity that it is made up of light source, optical modulator, optical fiber, photodetector, filter, amplifier etc. mixes regenerative feedback loop.Wherein optical fiber is formed high Q value low-loss loop as time delay and energy-storage units with other element, thereby produces the microwave signal of high-purity, low phase noise.The distinguishing feature of OEO is that microwave signal phase noise that it produced and oscillator operating frequency are irrelevant.Therefore compare with the traditional microwave oscillator, OEO has more potential advantages.
In OEO, fiber lengths has determined the Q of system value.If do not consider the relative intensity noise and the amplifier noise of laser, the phase noise of OEO output microwave is the quadratic power downward trend along with the increase of fiber delay time.Selecting long optical fibers is the main path that improves OEO output microwave signal quality.But along with the increase of fiber lengths, longitudinal mode spacing possibly be reduced to tens kHz magnitudes in the OEO chamber, select the electrical filter that single frequency of oscillation need be rather narrow, and this is difficult to realize at high band.In order to realize the output of high-quality single mode, the researcher has proposed the OEO structure of double loop and many loops.Under many loop structures, OEO starting of oscillation pattern is by the common pattern decision of supporting of all loops, and system's intermode adopts the relatively large band pass filter of bandwidth still can realize the single mode output that side mode suppression ratio is higher apart from broadening.The commercial high-quality OEO that adopts many loops at present is when 10GHz works, and its microwave phase noise can reach-163dBc/Hz at frequency deviation 10kHz place.Except that many loop structures, the mode through injection locking also can realize higher side mode suppression ratio.
But OEO discussed above belongs to the fixing type of centre frequency, can only near a certain frequency, work, and has limited its range of application.For realizing the tunability of output frequency, then need select tunable narrow-band filter and wide-band amplifier.Relatively successful method is to adopt the structure of yttrium iron garnet (YIG) type tunable optic filter at present.Results reported has realized the continuously adjustable microwave output of 6-12GHz.Its maximum operating frequency and tuning range are subject to the performance of YIG-filter.But YIG-filter the high band bandwidth still big (～40MHz30-40GHz), it is also relatively large to insert loss, needs to adopt multiring structure and enough electricity gains are provided, cost is higher.In addition, tunable OEO scheme based on tunable optical source (TLS) and Fabry Perot cavity semiconductor laser (FP-LD) is also arranged recently.Thereby this scheme utilizes modulation sideband, and the FP-LD longitudinal mode beat frequency that modulator produces among the OEO to produce the alternative microwave filter of arrowband microwave signal, and tunable characteristic then realizes through changing the working temperature of injecting optical maser wavelength or changing FP-LD.For guaranteeing stable operation, FP-LD need adopt temperature control measures.The deficiency of this scheme is: if 1. adopt tunable laser control frequency of oscillation, can increase substantially system cost, and be unfavorable for the system integration; Since in the system FP-LD need be operated in non-swash penetrate state, its each longitudinal mode intensity changes easily, has the unsteadiness factor, is to guarantee system's reliability service, need do accurate temperature control to FP-LD.
Therefore; Need the urgent technical problem that solves of those skilled in the art to be exactly at present: how can propose a kind of optical-electronic oscillator with innovating,, effectively to satisfy the wideband adjustable of OEO to solve the deficiency that exists in the prior art based on photon filtering; Working stability, the characteristics of compact conformation.
Summary of the invention
Technical problem to be solved by this invention provides a kind of optical-electronic oscillator based on photon filtering, and in order to guarantee the wideband adjustable of optical-electronic oscillator, working stability and structure are tight.
In order to address the above problem, the invention discloses a kind of optical-electronic oscillator based on photon filtering, said optical-electronic oscillator comprises:
Electrooptic modulator, the Laser Modulation that is used for incident is to carry the light signal of optical-electronic oscillator system clock, modulating frequency is the frequency of oscillation of optical-electronic oscillator;
Optical coupler is used for that the light signal after the electrooptic modulator modulation is met the part of presetting performance number and is coupled into follow-up circulator;
Optical circulator is used to receive the light signal that optical coupler is coupled, and the light signal that receives is passed to the amplification feedback semiconductor laser, guarantees the single file transmission of light signal simultaneously;
Amplify feedback semiconductor laser, the light signal that is used for the capable device transmission of focus ring carries out filtering and amplification, adjusts the frequency of oscillation of optical-electronic oscillator simultaneously through the injection current in adjustment amplification feedback semiconductor laser phase modulation district;
Photodetector be used for the light signal that amplifies the feedback semiconductor laser processing is changed into the signal of telecommunication, and the signal of telecommunication after will transforming is transferred to microwave amplifier;
Microwave amplifier is used to amplify the signal of telecommunication after photodetector transforms, and makes the optical-electronic oscillator system gain greater than oscillation threshold;
Microwave power distributor is used to receive the signal of telecommunication that microwave amplifier amplifies, and chooses a part of microwave energy transfer according to preset need and give microwave phase shifter;
Microwave phase shifter is used for regulating microwave amplifier and amplifies the back signal of telecommunication and the relative phase that gets into the electrooptic modulator light signal, so that reach optimum output.
Preferably, said optical-electronic oscillator also comprises:
External laser is used to the laser that the optical-electronic oscillator system provides incident.
Preferably, the incident laser of said optical-electronic oscillator provides by amplifying feedback semiconductor laser.
Preferably, said amplification feedback semiconductor laser is a kind of integrated syllogic self-pulsing semiconductor laser device of Distributed Feedback Laser district, phase modulation district and amplification region.
Preferably, said phase modulation district and amplification region are formed the feedback district jointly, and forming Compound Cavity with the Distributed Feedback Laser district provides dual-mode laser output.
Compared with prior art, the present invention has the following advantages:
The present invention provides a kind of optical-electronic oscillator based on photon filtering, adopts amplification feedback semiconductor laser (Amplified Feedback Laser is called for short AFL) to replace traditional electrical territory filter as light territory filter.Utilize the microwave signal that beat frequency goes out between the AFL longitudinal mode laser that injects AFL to be modulated, form the self feed back oscillatory system, realize the function of high-quality microwave and light time clock output as the drive source of modulator.
Description of drawings
Fig. 1 is the structure chart of the described a kind of optical-electronic oscillator based on photon filtering of the embodiment of the invention;
Fig. 2 is that the embodiment of the invention is described with the structural representation of AFL as the exterior injection type optical-electronic oscillator of photon filter;
Fig. 3 be the embodiment of the invention described based on the filtering of AFL photon from pouring-in optical-electronic oscillator sketch map.
Embodiment
For make above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, below in conjunction with accompanying drawing and embodiment the present invention done further detailed explanation.
Embodiment:
With reference to Fig. 1, show the structure chart of a kind of optical-electronic oscillator based on photon filtering of the present invention, said oscillator comprises: electrooptic modulator (Mod) 101; Optical coupler (OC) 102, optical circulator (Circ) 103 amplifies feedback semiconductor laser (AFL) 104; Photodetector (PD) 105; Microwave amplifier (EA) 106, microwave power distributor (EC) 107 and microwave phase shifter (Phase Shifter) 108, wherein:
Electrooptic modulator 101, the Laser Modulation that is used for incident is to carry the light signal of optical-electronic oscillator system clock, modulating frequency is the frequency of oscillation of optical-electronic oscillator;
Optical coupler 102 is used for that the light signal after the electrooptic modulator modulation is met the part of presetting performance number and is coupled into follow-up circulator;
Optical circulator 103 is used to receive the light signal that optical coupler is coupled, and the light signal that receives is passed to the amplification feedback semiconductor laser, guarantees the single file transmission of light signal simultaneously;
Amplify feedback semiconductor laser 104, the light signal that is used for the capable device transmission of focus ring carries out filtering and amplification, adjusts the frequency of oscillation of oscillator simultaneously through the injection current in adjustment amplification feedback semiconductor laser phase modulation district;
Photodetector 105 be used for the light signal that amplifies the feedback semiconductor laser processing is changed into the signal of telecommunication, and the signal of telecommunication after will transforming is transferred to microwave amplifier;
Microwave amplifier 106 is used to amplify the signal of telecommunication after photodetector transforms, and makes the optical-electronic oscillator system gain greater than oscillation threshold;
Microwave power distributor 107 is used to receive the signal of telecommunication that microwave amplifier amplifies, and chooses a part of microwave energy transfer according to preset need and give microwave phase shifter;
Microwave phase shifter 108 is used to regulate microwave amplifier and amplifies the back signal of telecommunication and get into the wherein relative phase of light signal of electrooptic modulation, so that reach optimum output.
Preferably, said oscillator also comprises:
External laser is used to the laser that the optical-electronic oscillator system provides incident.
Preferably, the incident laser of said oscillator provides by amplifying feedback semiconductor laser.
Referring to Fig. 2, show the structural representation as the exterior injection type optical-electronic oscillator of photon filter with AFL, wherein:
Optical Signal is an incident laser, both can be continuous light, also can be the flashlight that has clock information, and its effect is for system primary power to be provided.Incident light at first gets into electrooptic modulator Mod.
Mod is an electrooptic modulator, and it is used to from the electric clock of microwave power distributor EC the light signal (Optical signal) of incident modulated, and modulating frequency is an OEO system oscillation frequency.After the Mod modulation, carried system clock in the light signal.
OC is an optical coupler, is coupled in the follow-up circulator (Circ) from most of light of Mod, and other has sub-fraction light to be exported to outside the oscillator, and light time clock output can be provided.
Circ is an optical circulator, and it has guaranteed the one-way transmission of light signal.Incident optical signal from OC is input among the amplification feedback semiconductor laser AFL by 2 ports after the 1 port incident of Circ, and after AFL accomplishes photon filtering, is exported by 3 ports.
AFL is for amplifying feedback semiconductor laser, and its effect is photon filtering.The centre frequency of filter is by the intermode beat frequency decision of AFL.Through the injection current in adjustment AFL phase modulation district, can realize the adjustment on a large scale of centre frequency.Filter bandwidht is by AFL longitudinal mode stability and inject signal deciding, through control amplification region feedback intensity, can improve longitudinal mode stability.
PD is a photodetector, and its effect is to change into the signal of telecommunication to the light signal after AFL filtering, supplies follow-up electric amplifier to amplify.
EA is a microwave amplifier, and its effect is to amplify the signal of telecommunication that PD detects, and makes system gain surpass oscillation threshold.
EC is a microwave power distributor, and most of microwave energy gets into microwave phase shifter Phase Shifter, and some microwave is exported with electric clock mode in addition.
Phase Shifter is a microwave phase shifter, and its effect is the signal of telecommunication and the relative phase that gets into light signal among the Mod behind the adjusting EA, so that reach optimum output.
After the signal of telecommunication is through Phase shifter, inject the Mod modulation port, light signal is modulated.Through above flow process, the photoelectricity mixing loop in the oscillator is accomplished a circulation, forms regenerative feedback loop.When injecting signal is the direct current light time; Mainly control beat signal frequency through phase modulation district and the amplification region electric current of regulating AFL; This beat signal injects AFL after amplification rear drive modulator is to the direct current light modulation, form positive feedback, and finally setting up with the intrinsic beat frequency of AFL is the vibration of centre frequency.If the injection signal is a pulse signal, regulate AFL and make a certain frequency component of its beat signal near the injected pulse signal, make AFL by this frequency component injection locking, can set up the photoelectricity vibration synchronous with the frequency component of signal.Utilize this function not only can realize the fundamental frequency Clock Extraction, can also realize the harmonic wave Clock Extraction.
Referring to Fig. 3, show based on the filtering of AFL photon from pouring-in optical-electronic oscillator sketch map.Wherein the component function in each parts and the scheme 1 is similar.Main difference is, no longer needs external light source to keep vibration from pouring-in optical-electronic oscillator.Because AFL itself is exactly a LASER Light Source, therefore can replace the DC light source among traditional OEO with AFL.That is to say that AFL has played the double action of light source and photon filter simultaneously.When realizing this structure
In the starting stage that vibration is set up; AFL is as light source; Be placed on before the modulator Mod, surveyed by PD, and amplify rear drive Mod through EA light signal is modulated by the laser that has beat signal that AFL sends; Driving frequency and AFL signal are regulated phase shifter and can be made the beat signal of modulation signal and AFL synchronous with frequently.
The laser of another port output of OC2 gets in the loop 2; 1 port via Circ is injected among the AFL, because the laser before injecting contains purer frequency component by the Mod modulation; After injecting AFL; AFL gets into more stable operating state, and the equivalent filter bandwidth also narrows down thereupon, helps improving system's output spectrum purity
OC1 is a selectable unit; Can need other pending pulse signal in the injection of OC1 place; The signal that inject AFL this moment has contained outer signals simultaneously and has injected signal certainly; Through controlling the outer signal strength signal intensity of injecting, can realize that not only the fundamental frequency harmonic is synchronous, Clock Extraction, can also realize fractional order Frequency Synchronization and clock abstraction function.
Preferably, said amplification feedback semiconductor laser is a kind of integrated syllogic self-pulsing semiconductor laser device of Distributed Feedback Laser district, phase modulation district and amplification region.
Preferably, said phase modulation district and amplification region are formed the feedback district jointly, and forming Compound Cavity with Distributed Feedback Laser provides dual-mode laser output.
The described a kind of optical-electronic oscillator based on photon filtering of present embodiment adopts amplification feedback semiconductor laser (Amplified Feedback Laser is called for short AFL) to replace traditional electrical territory filter as light territory filter.Utilize the microwave signal that beat frequency goes out between the AFL longitudinal mode laser that injects AFL to be modulated, form the self feed back oscillatory system, realize the function of high-quality microwave and light time clock output as the drive source of modulator.
AFL is a kind of integrated syllogic self-pulsing semiconductor laser device of Distributed Feedback Laser district, phase modulation district and amplification region.The feedback district is formed in phase modulation district and amplification region, and the phase modulation district is used for the control model spacing, and the amplification region is used for Control and Feedback intensity.Through regulating the injection current in phase region and amplifier district, can control the output pulse frequency of AFL.AFL is had the following advantages as photon filter:
A) working band is high, tunable range is wide, passband width is narrow
The microwave frequency that AFL can export realizes high-frequency work easily by the light wave mode interval decision of starting of oscillation in its resonant cavity.AFL output microwave frequency has covered the 7-50GHz scope at present.And having the adjustable extent of 1-20GHz, when freely turning round, output microwave three dB bandwidth is at 3-8MHz.When having signal to inject, AFL can be locked on external signal clock frequency or its harmonic frequency, and output microwave bandwidth more can be narrow to the kHz magnitude.AFL as active narrow band filter, can be realized high-quality microwave output.On passband width, tuning range and working frequency range, AFL is relative, and electrical filter all has great advantage, and is fit to do high-quality tunable optical subfilter.
B) do not have the loss of insertion, the work threshold value is low
Because AFL itself is exactly the active amplifying device with energy-storage function; The loss problem of utilizing AFL not only can avoid the arrowband electrical filter to be brought as filter; Additional gain can also be provided; Thereby the reduction system also can reduce the requirement to incident laser power to the requirement of electric amplifier gain.
C) mode characteristic is good, and it is more stable to work
AFL as photon filter is operated in the sharp state of penetrating, and has more stable output than being operated in the non-FP-LD that swashs the state of penetrating.Simultaneously,, need not in system, to add long optical fibers again, thereby avoided multimode oscillation and moding problem among the OEO because of the Q value of AFL is very high.
D) need not external light source, more compact structure, cost is cheaper
Because AFL itself also is well behaved laser, can adopt from injection mode (seeing this patent implementation method for details), need not external light source and can realize vibration.Benefit from the mode characteristic of AFL on the other hand, OEO need not adopt many rings scheme to suppress the limit again and touch, the whole system more compact structure, and cost is cheaper.
Substitute electrical filter with AFL and can realize being operated in high band, and have the novel photoelectric oscillator of big tuning range, further expand working range and the application of OEO as the frequency-selecting element of OEO.
More than a kind of optical-electronic oscillator based on photon filtering provided by the present invention has been carried out detailed introduction; Used concrete example among this paper principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (5)
1. the optical-electronic oscillator based on photon filtering is characterized in that, said optical-electronic oscillator comprises:
Electrooptic modulator, the Laser Modulation that is used for incident is to carry the light signal of optical-electronic oscillator system clock, modulating frequency is the frequency of oscillation of optical-electronic oscillator;
Optical coupler is used for that the light signal after the electrooptic modulator modulation is met the part of presetting performance number and is coupled into follow-up circulator;
Optical circulator is used to receive the light signal that optical coupler is coupled, and the light signal that receives is passed to the amplification feedback semiconductor laser, guarantees the single file transmission of light signal simultaneously;
Amplify feedback semiconductor laser, the light signal that is used for the capable device transmission of focus ring carries out filtering and amplification, adjusts the frequency of oscillation of optical-electronic oscillator simultaneously through the injection current in adjustment amplification feedback semiconductor laser phase modulation district;
Photodetector be used for the light signal that amplifies the feedback semiconductor laser processing is changed into the signal of telecommunication, and the signal of telecommunication after will transforming is transferred to microwave amplifier;
Microwave amplifier is used to amplify the signal of telecommunication after photodetector transforms, and makes the optical-electronic oscillator system gain greater than oscillation threshold;
Microwave power distributor is used to receive the signal of telecommunication that microwave amplifier amplifies, and chooses a part of microwave energy transfer according to preset need and give microwave phase shifter;
Microwave phase shifter is used for regulating microwave amplifier and amplifies the back signal of telecommunication and the relative phase that gets into the electrooptic modulator light signal, so that reach optimum output.
2. optical-electronic oscillator according to claim 1 is characterized in that, said optical-electronic oscillator also comprises:
External laser is used to the laser that the optical-electronic oscillator system provides incident.
3. optical-electronic oscillator according to claim 1 is characterized in that:
The incident laser of said optical-electronic oscillator provides by amplifying feedback semiconductor laser.
4. optical-electronic oscillator according to claim 3 is characterized in that:
Said amplification feedback semiconductor laser is a kind of integrated syllogic self-pulsing semiconductor laser device of Distributed Feedback Laser district, phase modulation district and amplification region.
5. optical-electronic oscillator according to claim 4 is characterized in that:
Said phase modulation district and amplification region are formed the feedback district jointly, and forming Compound Cavity with the Distributed Feedback Laser district provides dual-mode laser output.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109309334A (en) * | 2018-11-13 | 2019-02-05 | 北京无线电计量测试研究所 | Based on warbled optical-electronic oscillator and control method |
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| CN103022857B (en) * | 2012-12-10 | 2015-03-25 | 贵州大学 | Highly-stable single-mode microwave optoelectronic oscillator |
| CN103346469B (en) * | 2013-06-20 | 2015-11-18 | 上海航天测控通信研究所 | A kind of optical-electronic oscillator |
| CN103401141B (en) * | 2013-08-05 | 2016-03-30 | 中国人民解放军理工大学 | A kind of optical-electronic oscillator based on directly modulation distributed feedback type semiconductor laser |
| CN103676217A (en) * | 2013-12-03 | 2014-03-26 | 上海交通大学 | High-frequency microwave photon phase shifter |
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| CN1338135A (en) * | 1999-01-26 | 2002-02-27 | 加利福尼亚理工学院 | Opto-electronic oscillators having optical resonators |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109309334A (en) * | 2018-11-13 | 2019-02-05 | 北京无线电计量测试研究所 | Based on warbled optical-electronic oscillator and control method |
| CN109309334B (en) * | 2018-11-13 | 2020-04-28 | 北京无线电计量测试研究所 | Frequency modulation-based optoelectronic oscillator and control method |
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