CN102545042A - Production method of optical microwave signal with tunable broadband frequency - Google Patents
Production method of optical microwave signal with tunable broadband frequency Download PDFInfo
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Abstract
The invention discloses a production method of an optical microwave signal with tunable broadband frequency. The method comprises the following steps: constructing a stable dual-loop low-frequency optoelectronic oscillator; injecting an external continuous lights into the optoelectronic oscillator, implementing the injection locking in a directly modulated laser of a core component of the optoelectronic oscillator to finish the up-conversion process of the optical microwave so as to generate a high-frequency optical microwave signal; implementing the tunability of the optoelectronic oscillator by adjusting the wavelength, optical power and polarization state of the external continuous lights so as to generate the optical microwave signal with needed frequency. By injecting the external continuous lights into the directly modulated laser in the optoelectronic oscillator and then locking an optical carrier wave after the up-conversion is generated under a high-order mode, the high-quality optical microwave signal is produced. The method provided by the invention can be used for producing any high-frequency optical microwave signal based on an injection locking technology by using the lower-frequency electric signal, and the tunability of the microwave frequency can be realized by only controlling the wavelength, polarization state and optical power of the injected continuous lights.
Description
Technical field
The present invention relates to microwave photon field in optical communication and the microwave/millimeter wave technology, be specifically related to the optical-electronic oscillator that frequency-tunable light microwave signal produces.
Background technology
Over nearly more than 20 years under the considerable development condition of microwave photon technology; Owing to can producing high-quality high frequency light microwave signal simultaneously, optical-electronic oscillator (OEO) caused concern widely; A considerable amount of domestic and international research institutions are being engaged in OEO or relevant with it research with the scientific research personnel, and OEO obtains amazing development with its salient feature.
The earliest OEO structure is proposed in nineteen eighty-two by Neyer and Voges in the world, utilizes this loop configuration of output light signal FEEDBACK CONTROL electrooptic modulator to realize oscillator.The structure that X.Yao proposed in 1994 has been created the main flow system framework of OEO development, and it is by low noise light source, electrooptic modulator; Optical fiber, photodetector, radio frequency amplifier; The frequency microwave filter constitutes the oscillating loop of photoelectricity mixed structure and realizes self-injection locking; And X.Yao has done the detailed system analysis in 1996 to this structure, has set up complete theory analysis in conjunction with experimental result, has explained the function of each independent sector of OEO loop.The researcher adopted the photonic crystal fiber (PCF) to the temperature sensitivity difference to replace Conventional SMF construction system link afterwards; Dicyclo long optical fibers modeling type OEO can suppress the limit mode noise of monocycle modeling OEO effectively; Long optical fibers can provide energy-accumulating medium; Improve the Q value of signal, many loop structures of reporting at present have several kinds like this: the double loop structure of photoelectricity mixing loop, photoelectricity independently double loop structure, light territory branch, close the double loop structure on road.
Above method is a kind of device that the continuous light power conversion is become the periodic signal of the higher-order of oscillation basically; Much more more what to pay close attention to is how to utilize optical technology to realize energy storage, filtering; Finally obtain high-quality microwave signal; Seldom consider the light microwave that produces optional frequency based on the OEO structure, and realize that OEO produces the tunability of light microwave frequency.
Summary of the invention
The present invention seeks to solve the problems such as frequency limited that the light microwave tunability that present optical-electronic oscillator produces is poor, produce high-frequency microwave signal; The production method of the tunable smooth microwave signal of a kind of wideband frequency is provided, realizes that truly generation optional frequency produces and the optical-electronic oscillator of frequency-tunable.
The production method of the tunable smooth microwave signal of wideband frequency based on injection locking technique provided by the invention, this method comprises:
The first, at first make up a stable double loop low frequency optical-electronic oscillator;
The second, the continuous light with the outside is injected in the optical-electronic oscillator, in the core component directly modulated lasers of optical-electronic oscillator, realizes injection locking, accomplishes the up-conversion process of light microwave, produces the light microwave signal of high frequency;
Three, realize the tunability of optical-electronic oscillator through adjusting outside continuous light wavelength, luminous power and polarization state simultaneously, thereby produce the light microwave signal of required frequency.
The constructed double loop low frequency optical-electronic oscillator of the first step comprises directly modulated lasers, Polarization Controller, optical circulator, laser, image intensifer, optical coupler, polarization beam apparatus, first optical fiber, second optical fiber, first Polarization Controller, second Polarization Controller, polarization beam combiner, photodetector, electric power splitter, microwave filter and microwave amplifier; Directly modulated lasers is used for the first port a that the outside laser that injects continuous light connects optical circulator through the second port b of Polarization Controller connection optical circulator, and the 3rd port c of optical circulator is through image intensifer connection optical coupler input; The output of optical coupler is divided into two-way; One the tunnel exports as light signal, and another road connects polarization beam apparatus, and the output of polarization beam apparatus is divided into two-way; One the tunnel is connected polarization beam combiner through first optical fiber with first Polarization Controller successively; Another road is connected polarization beam combiner through second optical fiber with second Polarization Controller successively, and polarization beam combiner output connects electric power splitter through photodetector, and the output of electric power splitter is divided into two-way; One the tunnel exports as the signal of telecommunication, and another road is connected directly modulated lasers through microwave filter with the microwave amplifier feedback successively.
The continuous light that the described laser that is used for outside injection continuous light produces is injected into directly modulated lasers; Produce high frequency carrier through injection locking technique; Through adjusting the tuning performance that continuous light wavelength, luminous power and polarization state realize frequency doubling technology simultaneously, thereby produce the microwave signal of required frequency.
Advantage of the present invention and beneficial effect:
1, the light microwave frequency of formation optical-electronic oscillator can be very low among the present invention program, and need not microwave local oscillation.2, the light microwave signal that produces is owing to adopt injection locking technique, and the light microwave frequency that therefore produces is unrestricted.3, it is simple newly to produce the generation and the tunability method of operation of frequency of light microwave signal.
Description of drawings
Fig. 1 is an optical-electronic oscillator general structure sketch map of the present invention;
Fig. 2 is injection locking and tuning method operation principle sketch map among the present invention, and a is the ideograph that exists after the OEO stable oscillation stationary vibration, and b is the ideograph after the injection locking.
Among the figure, 1 directly modulated lasers, 2 Polarization Controllers, 3 optical circulators, 4 lasers; 5 image intensifers, 6 optical couplers, 7 polarization beam apparatus, 8 first optical fiber; 9 second optical fiber, 10 first Polarization Controllers, 11 second Polarization Controllers, 12 polarization beam combiners; 13 photodetectors, 14 electric power splitters, 15 microwave filters, 16 microwave amplifiers.
Below in conjunction with accompanying drawing the wideband frequency tunable optical electrical oscillator based on injection locking technique is elaborated.
Embodiment
The production method of the tunable smooth microwave signal of wideband frequency based on injection locking technique provided by the invention, this method comprises:
The first, at first make up a stable double loop low frequency optical-electronic oscillator;
The second, the continuous light with the outside is injected in the optical-electronic oscillator, in the core component directly modulated lasers of optical-electronic oscillator, realizes injection locking, accomplishes the up-conversion process of light microwave, produces the light microwave signal of high frequency;
Three, realize the tunability of optical-electronic oscillator through adjusting outside continuous light wavelength, luminous power and polarization state, thereby produce the light microwave signal of required frequency.
The constructed double loop low frequency optical-electronic oscillator of the first step of the present invention is as shown in Figure 1; This optical-electronic oscillator comprises; Directly modulated lasers 1, Polarization Controller 2, optical circulator 3, laser 4, image intensifer 5, optical coupler 6, polarization beam apparatus 7, first optical fiber 8, second optical fiber 9, first Polarization Controller 10, second Polarization Controller 11, polarization beam combiner 12, photodetector 13, electric power splitter 14, microwave filter 15 and microwave amplifier 16, the concrete annexation and the course of work of this optical-electronic oscillator are following:
Directly modulated lasers 1 connects the second port b of optical circulator 3 through Polarization Controller 2; Be used for the first port a that the outside laser 4 that injects continuous light connects optical circulator 3; The 3rd port c of optical circulator 3 connects the input of optical couplers 6 through image intensifer 5, and the output of optical coupler 6 is divided into two-way, and one the tunnel exports as light signal; Another road connects polarization beam apparatus 7; The output of polarization beam apparatus is divided into two-way, and one the tunnel is connected polarization beam combiner 12 through first optical fiber 8 with first Polarization Controller 10 successively, and another road is connected polarization beam combiner 12 through second optical fiber 9 with second Polarization Controller 11 successively; The output of polarization beam combiner 12 connects electric power splitter 14 through photodetector 13; The output of electricity power splitter 14 is divided into two-way, and one the tunnel exports as the signal of telecommunication, and another road is fed back with microwave amplifier 16 through microwave filter 15 successively and is connected directly modulated lasers 1.
The continuous light that the described laser 4 that is used for outside injection continuous light produces is injected into directly modulated lasers 1; Produce high frequency carrier through injection locking technique; Through adjusting the tuning performance that continuous light wavelength, luminous power and polarization state realize frequency doubling technology, thereby produce the microwave signal of required frequency.
At first by directly modulated lasers 1 output continuous light signal; After the optical-electronic oscillator that constitutes the loop is stablized starting of oscillation; Directly modulated lasers 1 produces the light pulse signal of modulation; The continuous light that then external laser 4 is produced is injected into directly modulated lasers 1 through optical circulator 3 and Polarization Controller 2, in directly modulated lasers 1, the low frequency light signal after the starting of oscillation is carried out frequency multiplication and just can have the high frequency light signal at the light path feedback fraction of optical-electronic oscillator later on, obtains the high frequency light signal at the light signal output end of optical coupler 6; Electrical signal at electric power splitter 14 obtains high frequency electrical signal, and is as shown in Figure 1.
Injection locking and tuning method are seen shown in Figure 2:
According to closing structure shown in Figure 1, after OEO stable oscillation stationary vibration, in the closed-loop path, not only there is stronger and stable low-frequency oscillation component, also there are more weak different high fdrequency components simultaneously, like Fig. 2-a.After outside continuous light is injected into directly modulated lasers; The system that exterior light is injected semiconductor laser (SLD) constitutes a nonlinear kinetics system (NDS); This is the change owing to the photon density of the introducing SLD resonant cavity of outside injection light, thereby can know according to the rate equation modeling of CGCM, and reformed photon density causes that the carrier density in the chamber changes; And the variation of carrier density can cause the further change of photon density conversely; Thereby cause the change of SLD output light field, this is because the system of the dynamic change that the injection photoconduction causes is a dynamic system by the parameter control of injecting light.Along with the difference of injecting distribution of light intensity or light frequency, the variation of output light field presents one-period attitude, two cycles attitude, multicycle attitude and chaos state respectively.Just be based on one-period attitude realization injection locking in the present invention.Injecting light at first locks the pattern at corresponding injection light frequency place in the directly modulated lasers and evokes mode oscillation.This oscillation mode only accounts for the sub-fraction of the free operation mode of directly modulated lasers when just beginning; Along with the gain at this pattern place of directly modulated lasers change in current is more and more stronger; Loss reduces gradually, in competition process, occupies an leading position gradually, and the competition result is that this pattern is set up stable vibration in resonant cavity; The pattern that directly modulated lasers freely turns round is then suppressed fully, has realized injection locking.Thereby directly modulated lasers has at least a pattern to be locked, and this pattern is corresponding to a certain high fdrequency component, and certain quantitative relationship is arranged, so this high fdrequency component is exaggerated, and other frequency component is suppressed, like Fig. 2-b.
In order to make injection locking reach optimal effectiveness, power obtains maximum the amplification, and polarization state of light must be consistent with the polarization state of directly modulated lasers continuously, like this can maximized minimizing energy loss, and the injection locking of realization optimization.The Luke F. Lester professor seminar at U.S. NewMexico university high-tech material center has provided frequency of oscillation f in the P1 oscillation effect of report quantum dot FP-LD
rCalculation expression, and given proof through Theoretical Calculation and experiment test.Formula
In Ω
rThe angular frequency of expression P1 vibration is corresponding to f
r, Ω
FrDescribe the Henan galloping of LD free oscillation attitude and swung frequency,
Representation unit is injected into the strength ratio in the chamber, γ in the time
s, γ
Th, γ
pRepresent that respectively the galloping of spontaneous radiation Henan swings speed, gain region translational movement (γ
Th=2 η
0Cos θ
0, unit/GHz), speed is swung in the Henan galloping of non-linear charge carrier, and α is the live width enhancer, θ
0Phase deviation (relevant) for master and slave laser with the frequency detuning amount.k
cBe coupling coefficient, describe the outer ratio of injecting luminous power to the interior luminous power of LD, c/n
g, L, R represent group velocity respectively, laser chamber is long, LD cavity reflection rate; Pmaster represents from lens fiber to the power from LD chamber face.Therefore adjust the effect that continuous polarization state of light and luminous power can change injection locking.Thereby adjust the signal frequency that continuous light wavelength can determine the pattern control injection locking of injection locking in addition.On the frequency tunability that realizes OEO, need adjust continuous light wavelength, luminous power and wavelength simultaneously, select to reach best frequency.
Claims (3)
1. the production method of the tunable smooth microwave signal of wideband frequency is characterized in that this method comprises:
The first, at first make up a stable double loop low frequency optical-electronic oscillator;
The second, the continuous light with the outside is injected in the optical-electronic oscillator, in the core component directly modulated lasers of optical-electronic oscillator, realizes injection locking, accomplishes the up-conversion process of light microwave, produces the light microwave signal of high frequency;
Three, realize the tunability of optical-electronic oscillator through adjusting outside continuous light wavelength, luminous power and polarization state simultaneously, thereby produce the light microwave signal of required frequency.
2. method according to claim 1; It is characterized in that the constructed double loop low frequency optical-electronic oscillator of the first step comprises directly modulated lasers, Polarization Controller, optical circulator, laser, image intensifer, optical coupler, polarization beam apparatus, first optical fiber, second optical fiber, first Polarization Controller, second Polarization Controller, polarization beam combiner, photodetector, electric power splitter, microwave filter and microwave amplifier; Directly modulated lasers is used for first port (a) that the outside laser that injects continuous light connects optical circulator through second port (b) of Polarization Controller connection optical circulator, and the 3rd port (c) of optical circulator is through image intensifer connection optical coupler input; The output of optical coupler is divided into two-way; One the tunnel exports as light signal, and another road connects polarization beam apparatus, and the output of polarization beam apparatus is divided into two-way; One the tunnel is connected polarization beam combiner through first optical fiber with first Polarization Controller successively; Another road is connected polarization beam combiner through second optical fiber with second Polarization Controller successively, and polarization beam combiner output connects electric power splitter through photodetector, and the output of electric power splitter is divided into two-way; One the tunnel exports as the signal of telecommunication, and another road is connected directly modulated lasers through microwave filter with the microwave amplifier feedback successively.
3. method according to claim 2; It is characterized in that the continuous light that the described laser that is used for outside injection continuous light produces is injected into directly modulated lasers; Produce high frequency carrier through injection locking technique; Through adjusting the tuning performance that continuous light wavelength, luminous power and polarization state realize frequency doubling technology simultaneously, thereby produce the microwave signal of required frequency.
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| CN103401141A (en) * | 2013-08-05 | 2013-11-20 | 中国人民解放军理工大学 | Direct modulation distributed feedback semiconductor laser-based photoelectric oscillator |
| CN103490817A (en) * | 2013-09-30 | 2014-01-01 | 中国人民解放军理工大学 | Photonic generation device for high-frequency microwaves and millimeter waves and feeding method |
| CN103825175A (en) * | 2014-03-11 | 2014-05-28 | 天津理工大学 | Passive mode-locking optical fiber laser based on saturable absorption mirror and composite cavity structure |
| CN103825172A (en) * | 2014-03-11 | 2014-05-28 | 天津理工大学 | Passive mode-locking optical fiber laser based on graphene and composite cavity structure |
| CN104752940A (en) * | 2013-12-27 | 2015-07-01 | 北京邮电大学 | Photoelectric oscillator |
| TWI500281B (en) * | 2014-02-27 | 2015-09-11 | Univ Nat Cheng Kung | Microwave power amplification apparatus and method thereof |
| CN106159639A (en) * | 2015-04-13 | 2016-11-23 | 北京大学 | A kind of broad tuning optoelectronic hybrid oscillator and microwave signal generate method |
| CN106848807A (en) * | 2017-03-02 | 2017-06-13 | 濮阳光电产业技术研究院 | A kind of tunable optical electrical oscillator based on Cross-phase Modulation |
| CN106921106A (en) * | 2017-04-26 | 2017-07-04 | 中国电子科技集团公司第三十八研究所 | A kind of small-sized Ultra-Low Phase Noise Optical-Electronic Oscillator and its optical microcavity preparation method |
| CN107508127A (en) * | 2017-09-28 | 2017-12-22 | 贵州大学 | A kind of microwave photon signal frequency multiplication method and device with amplitude equalization effect |
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| CN112054374A (en) * | 2020-09-10 | 2020-12-08 | 中国人民解放军国防科技大学 | High-power microwave source combining narrow-band and ultra-wide-band with tunable frequency |
| CN113839297A (en) * | 2021-09-08 | 2021-12-24 | 电子科技大学 | Photoelectric oscillator based on injection locking effect |
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