CN101247180A - Microwave signal frequency translation method and device based on optical fiber stimulated Brillouin scattering - Google Patents
Microwave signal frequency translation method and device based on optical fiber stimulated Brillouin scattering Download PDFInfo
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Abstract
The present invention discloses method and apparatus of microwave signal frequency transformation based on optical fiber stimulated Brillouin scattering. Light carrier of laser is split into two part, one part produces one level or high-grade stokes light by concatenation one or one more stimulated Brillouin scattering device, another part of light carrier combines with one part after microwave signal is converted by strength modulator modulating; or optical waves of laser connects with first end of first circulator by amplification, second end of first circulator is united by coupler with third end of first circulator modulated microwave signal by strength modulator. One or one more stimulated Brillouin scattering devices are connected between third end of first circulator and coupler for implementing more high-frequency frequency transformation. Converted microwave signal is obtained by connecting light-sensitive cell after combination. the method adopts standard optical fiber component, and frequency fluctuate transform is realized by using the same method.
Description
Technical field
The present invention relates to photoelectron and microwave photon learns a skill, especially relate to a kind of microwave signal frequency translation method and device based on optical fiber stimulated Brillouin scattering.
Background technology
Along with the arrival of information age, communication becomes requisite important tool in social production and the life.The information of various ways such as data, voice, video and multimedia becomes geometric progression to increase rapidly, objectively the bandwidth of communication system is had higher requirement.The optical fiber properties requirement that can satisfy commercialization begins since nineteen seventies, and arterial grid extensively adopts the mode of optical fiber communication, and mainly in metropolitan area network adopts radio communication and broadband connections.Along with the direction of cordless communication network to broadband, individualized, packetizing and synthesization develops, the fusion of radio communication and broadband connections becomes the inexorable trend of future development, so that multiple integrated services such as while supporting telephone business, data service, broadband multimedia services.For wireless communication system,, must improve the operating frequency of wireless carrier in order to obtain higher message transmission rate.The operating frequency of present most of radio communication services all concentrates on below the 5GHz, and along with the increase of amount of information, people also increase day by day to the demand of wireless frequency spectrum, and having more, the communication system of high workload frequency becomes a kind of selection that has potentiality.But high-frequency microwave is very big by the loss that the absorption of atmosphere, the reflection of building etc. cause, transmission is difficulty comparatively.The optical-fiber wireless transmission that proposes recently (Radio over Fiber, RoF) the effective access way between still not a kind of arterial grid of technology and the metropolitan area network, and can solve the problem that the high-frequency microwave wireless communication system exists.So-called optical-fiber wireless transmission technology, be meant and use optical fiber to replace atmosphere to transmit the high-frequency microwave broadband signal: be modulated to light carrier on by electrooptic modulating cell downstream signal and by the base station of Optical Fiber Transmission at central station, in base station place's demodulation and be fed to antenna transmission and give the client to far-end as transmission medium; Conversely, telepoint base station receives upward signal by antenna from the customers' place, realize the modulation of signal to light carrier by the electric light conversion, the information that receives is modulated on the light carrier equally and sends back central station by optical fiber, obtains the upward signal that transmits by photodetection.The optical-fiber wireless transmission system fully combines the advantage of Optical Fiber Transmission and wireless communication technology, can realize macroreticular capacity, high-frequency microwave signal Optical Fiber Transmission cheaply, and supports to surpass the super wideband wireless connecting system of 1Gb/s.
Studies show that in optical-fiber wireless system, the microwave that transmits in the optical fiber can be subjected to the influence of factors such as optical fiber dispersion and distortion and distortion take place, and the high more influence that is subjected to of microwave frequency is big more.In order both to guarantee the high workload frequency of microwave signal, avoid the influence of Optical Fiber Transmission chromatic dispersion again, between central station and base station, adopt the low frequency subcarrier to propagate, and the place, base station carry out microwave signal frequency on down conversion be a kind of efficient ways.The frequency translation of microwave signal can (StimulatedBrillouin Scattering, SBS) effect realizes by the stimulated Brillouin scattering in the optical fiber.Stimulated Brillouin scattering is a kind of nonlinear effect, and energy can shift to the stokes light of low frequency when the light intensity in inciding optical fiber surpassed Brillouin's threshold value, discharged acoustical phonon simultaneously.Because Brillouin shift is in the microwave section, if low frequency/high-frequency microwave is modulated on stokes light or the light carrier, and then carry out optical beat with light carrier or stokes light and can obtain the high-frequency/low-frequency microwave signal that needs, realize microwave signal frequency on/down conversion.
Summary of the invention
The object of the present invention is to provide a kind of microwave signal frequency translation method and device based on optical fiber stimulated Brillouin scattering, be to utilize stimulated Brillouin scattering effect in the optical fiber to realize down conversion on the frequency of high-frequency microwave signal, make light carrier that stimulated Brillouin scattering take place in optical fiber and produce stokes light, be carried in low frequency/high-frequency microwave signal to be converted on light carrier or the stokes light and carry out optical beat, both can realize on the frequency of microwave signal/down conversion.
The technical scheme that the present invention solves its technical problem employing is as follows:
One, a kind of microwave signal frequency translation method based on optical fiber stimulated Brillouin scattering:
Make light carrier that stimulated Brillouin scattering take place in optical fiber and produce stokes light, be carried in microwave signal to be converted on light carrier or the stokes light and carry out optical beat, realize the frequency translation of microwave signal.
With the light carrier separated into two parts, part light carrier incides stimulated Brillouin scattering generation stokes light takes place in the optical fiber, low frequency/high-frequency microwave signal to be converted is carried on stokes light or another part light carrier, on the frequency by optical beat realization microwave signal/and down conversion.
Light carrier is incided generation stimulated Brillouin scattering generation stokes light in the optical fiber, and low frequency/high-frequency microwave signal to be converted is carried on stokes light or the remaining light carrier, on the frequency by optical beat realization microwave signal/and down conversion.
Two, a kind of microwave signal frequency translation device based on optical fiber stimulated Brillouin scattering:
Device 1:
The light carrier of laser is by the first coupler separated into two parts, part light carrier is by the identical stimulated Brillouin scattering device of one or more structures of serial connection, produce one-level or senior inferior stokes light, another part light carrier is after intensity modulator has been modulated low frequency/high-frequency microwave signal to be converted, two parts light merges by second coupler, insert photodetector and carry out beat frequency, obtain the high-frequency/low-frequency microwave signal, photodetector is connected with spectrum analyzer.
Described stimulated Brillouin scattering device comprises image intensifer, circulator and optical fiber; First, second end of circulator connects the output and the optical fiber of image intensifer respectively, one end of input termination first coupler of the image intensifer during wherein first installs, the input of the image intensifer of middle each device all connects the 3rd end of circulator in the device, an input of the 3rd termination second coupler of the circulator in last device.
Device 2:
The light wave of laser connects first end of first circulator by first image intensifer, second end of first circulator through behind first optical fiber with modulated low frequency/high-frequency microwave signal to be converted through intensity modulator after the 3rd end of first circulator merge by coupler, insert photodetector generation beat frequency, obtain the high-frequency/low-frequency microwave signal, photodetector is connected with spectrum analyzer.
At the 3rd end and the indirect identical stimulated Brillouin scattering device of one or more structures of coupler of described first circulator, this device comprises image intensifer, circulator and optical fiber; First, second end of circulator connects the output and the optical fiber of image intensifer respectively, the 3rd end of input termination first circulator of the image intensifer during wherein first installs, the input of the image intensifer of middle each device all connects the 3rd end of the circulator of a device, the 3rd end of the circulator in last device connects an input of coupler after intensity modulator has been modulated low frequency/high-frequency microwave signal to be converted.
The useful effect that the present invention has is:
Utilize optical fiber stimulated Brillouin scattering down conversion on the difference on the frequency realization microwave signal frequency that produces between stokes light and the primary light carrier wave, what relate to all is standardization fiber optic element devices, it is convenient to realize, with low cost, and utilize identical method both can realize frequency up-converted, also can realize frequency downconverted, provide convenience for realizing the full duplex fibre-optical wireless transmitting system.
Description of drawings
Fig. 1 is a kind of scheme schematic diagram based on the optical fiber stimulated Brillouin scattering microwave signal frequency translation.
Fig. 2 is a kind of based on the cascaded optical fiber stimulated Brillouin scattering scheme schematic diagram of high-frequency microwave signal frequency translation more.
Fig. 3 is another kind of scheme schematic diagram based on the optical fiber stimulated Brillouin scattering microwave signal frequency translation.
Fig. 4 is another kind of based on the cascaded optical fiber stimulated Brillouin scattering scheme schematic diagram of high-frequency microwave signal frequency translation more.
Fig. 5 is the spectrum diagram of microwave signal frequency up conversion.
Fig. 6 is the spectrum diagram of microwave signal frequency down conversion.
Among the figure 1, laser, 2, image intensifer, 3, coupler, 4, circulator, 5, optical fiber, 6, intensity modulator, 7, photodetector, 8, spectrum analyzer.
Embodiment
As shown in Figure 1 and Figure 2, the light carrier of laser 1 of the present invention is by first coupler, 3 separated into two parts, part light carrier is by the identical stimulated Brillouin scattering device of one or more structures of serial connection, produce one-level or senior inferior stokes light, another part light carrier is after intensity modulator 6 has been modulated low frequency/high-frequency microwave signal to be converted, two parts light merges by second coupler 3, insert photodetector 7 and carry out beat frequency, obtain the high-frequency/low-frequency microwave signal, photodetector 7 is connected with spectrum analyzer 8.
As shown in Figure 2, described stimulated Brillouin scattering device comprises image intensifer 2, circulator 4 and optical fiber 5; First, second end of circulator 4 connects the output and the optical fiber 5 of image intensifer 2 respectively, one end of input termination first coupler 3 of the image intensifer 2 during wherein first installs, the input of the image intensifer 2 of middle each device all connects the 3rd end of circulator 4 in the device, an input of the 3rd termination second coupler 3 of the circulator 4 in last device.
As shown in Figure 3, the light wave of laser 1 of the present invention connects first end of first circulator 4 by first image intensifer 2, the 3rd end of first circulator 4 of second end of first circulator 4 behind first optical fiber 5 and after intensity modulator 6 has been modulated low frequency/high-frequency microwave signal to be converted merges by coupler 3, insert photodetector 7 beat frequency takes place, obtain the high-frequency/low-frequency microwave signal, photodetector 7 is connected with spectrum analyzer 8.
As shown in Figure 4, at the 3rd end and the identical stimulated Brillouin scattering device of coupler 3 indirect one or more structures of described first circulator 4 of Fig. 3, this device comprises image intensifer 2, circulator 4 and optical fiber 5; First, second end of circulator 4 connects the output and the optical fiber 5 of image intensifer 2 respectively, the 3rd end of input termination first circulator 4 of the image intensifer 2 during wherein first installs, the input of the image intensifer 2 of middle each device all connects the 3rd end of the circulator 4 of a device, the 3rd end of the circulator 4 in last device connects an input of coupler 3 after intensity modulator 6 has been modulated low frequency/high-frequency microwave signal to be converted.
Operation principle of the present invention is as follows:
Utilize a kind of scheme that optical fiber stimulated Brillouin scattering carries out the microwave frequency conversion as shown in Figure 1, the light carrier that laser produces is by the beam splitter separated into two parts, wherein a part incides stimulated Brillouin scattering takes place in the optical fiber, obtain the back to stokes light, the difference of its frequency and original optical carrier frequency is a Brillouin shift.Microwave signal to be transformed is carried on another part light carrier by intensity modulator, produces sideband in the frequency spectrum both sides of light carrier, and difference on the frequency equates with microwave signal to be transformed between sideband and the light carrier.Light carrier after the modulation carries out optical beat after merging with the stokes light that produces again, can realize the microwave frequency conversion.If what load is the low frequency microwave signal, realize frequency up-converted by optical beat, obtain high-frequency microwave signal; Conversely,, realize frequency downconverted, obtain the low frequency microwave signal by optical beat if loading is high-frequency microwave signal.
On the basis of scheme shown in Figure 1, adopt a plurality of stimulated Brillouin scattering devices, a part that laser is produced light carrier before beat frequency repeatedly incides senior stokes light of cascade stimulated Brillouin scattering generation takes place in the multifiber, the difference of its frequency and original optical carrier frequency is the summation of at different levels Brillouin shifts, so just can realize the frequency translation of each high-frequency microwave signal, as shown in Figure 2.
In Fig. 1, scheme shown in Figure 2, intensity modulator also can be moved in another light path, places between last circulator and second coupler, and microwave signal to be converted is carried on the stokes light.
Adopt scheme shown in Figure 3 also can realize the microwave frequency conversion.The light carrier that laser produces incides through circulator stimulated Brillouin scattering takes place in the optical fiber, obtains the back to stokes light, and the difference of its frequency and original optical carrier frequency is a Brillouin shift.The stokes light that produces enters another branch of light path by circulator, microwave signal to be transformed is carried on the stokes light by intensity modulator, produce sideband in the frequency spectrum both sides of light carrier, difference on the frequency equates with microwave signal to be transformed between sideband and the light carrier.Stokes light after the modulation carries out optical beat after merging with remaining light carrier again, can realize the microwave frequency conversion.If what load is the low frequency microwave signal, realize frequency up-converted by optical beat, obtain high-frequency microwave signal; Conversely,, realize frequency downconverted, obtain the low frequency microwave signal by optical beat if loading is high-frequency microwave signal.
Equally, scheme shown in Figure 3 is improved, adopted a plurality of stimulated Brillouin scattering devices, also can realize the frequency translation of higher frequency microwave signal, specific practice as shown in Figure 4.The light carrier that before beat frequency laser is produced repeatedly incides and the cascade stimulated Brillouin scattering takes place in the multifiber produces senior stokes light, and the difference of its frequency and original optical carrier frequency is the summation of at different levels Brillouin shifts.
In Fig. 3, scheme shown in Figure 4, intensity modulator also can be moved in another light path, places between first optical fiber and the coupler, and microwave signal to be converted is carried on the remaining light carrier.
Embodiment 1:
If low frequency microwave signal frequency to be transformed is 1.5GHz, it is loaded on the light carrier according to mode shown in Figure 1, beat frequency takes place in the stokes light (frequency displacement is 10.6GHz) with the optical fiber stimulated Brillouin scattering generation then, can obtain the high-frequency microwave signal that frequency is 10.6+1.5=12.1GHz and 10.6-1.5=9.1GHz by this process, realize frequency up-converted, its frequency spectrum as shown in Figure 5.
Embodiment 2:
If high-frequency microwave signal frequency to be transformed is 9GHz, it is loaded on the light carrier according to mode shown in Figure 1, the stokes light generation beat frequency that produces with optical fiber stimulated Brillouin scattering then, can obtain the low frequency microwave that frequency is 10.6-9=1.6GHz by this process, realize frequency downconverted, its frequency spectrum as shown in Figure 6.
Embodiment 3:
(schematic diagram does not provide to adopt Fig. 1 or scheme shown in Figure 2, similar with Fig. 1 or Fig. 2), signal to be transformed and modulator are moved in the other light path between last circulator and second coupler, signal loading to be transformed to the stokes light of optical fiber stimulated Brillouin scattering generation, is carried out microwave signal frequency translation with another part light carrier by optical beat again.
Embodiment 4:
(schematic diagram does not provide to adopt Fig. 3 or scheme shown in Figure 4, similar with Fig. 3 or Fig. 4), signal to be transformed and modulator are moved in the other light path between the optical fiber and coupler, to remaining light carrier, the stokes light with the optical fiber stimulated Brillouin scattering generation carries out microwave signal frequency translation by optical beat again with signal loading to be transformed.
In the present invention, laser can select wave band to be suitable for producing the various continuous light lasers of stimulated Brillouin scattering in optical fiber, image intensifer, coupler, circulator, intensity modulator, photodetector all can be selected various commercialization components and parts for use, optical fiber can adopt the commercial optical fiber of all size, as standard single-mode fiber, dispersion shifted optical fiber, microstructured optical fibers etc.
Claims (7)
1. microwave signal frequency translation method based on optical fiber stimulated Brillouin scattering, it is characterized in that: make light carrier that stimulated Brillouin scattering take place in optical fiber and produce stokes light, be carried in microwave signal to be converted on light carrier or the stokes light and carry out optical beat, realize the frequency translation of microwave signal.
2. a kind of microwave signal frequency translation method according to claim 1 based on optical fiber stimulated Brillouin scattering, it is characterized in that: with the light carrier separated into two parts, part light carrier incides stimulated Brillouin scattering generation stokes light takes place in the optical fiber, low frequency/high-frequency microwave signal to be converted is carried on stokes light or another part light carrier, on the frequency by optical beat realization microwave signal/and down conversion.
3. a kind of microwave signal frequency translation method according to claim 1 based on optical fiber stimulated Brillouin scattering, it is characterized in that: light carrier is incided stimulated Brillouin scattering generation stokes light takes place in the optical fiber, low frequency/high-frequency microwave signal to be converted is carried on stokes light or the remaining light carrier, on the frequency by optical beat realization microwave signal/and down conversion.
4. the device that is used for the described a kind of microwave signal frequency translation method based on optical fiber stimulated Brillouin scattering of claim 1, it is characterized in that: the light carrier of laser (1) is by first coupler (3) separated into two parts, part light carrier is by the identical stimulated Brillouin scattering device of one or more structures of serial connection, produce one-level or senior inferior stokes light, another part light carrier is after intensity modulator (6) has been modulated low frequency/high-frequency microwave signal to be converted, two parts light merges by second coupler (3), insert photodetector (7) and carry out beat frequency, obtain the high-frequency/low-frequency microwave signal, photodetector (7) is connected with spectrum analyzer (8).
5. the device of a kind of microwave signal frequency translation method based on optical fiber stimulated Brillouin scattering according to claim 4, it is characterized in that: described stimulated Brillouin scattering device comprises image intensifer (2), circulator (4) and optical fiber (5); First, second end of circulator (4) connects the output and the optical fiber (5) of image intensifer (2) respectively, one end of input termination first coupler (3) of the image intensifer (2) during wherein first installs, the input of the image intensifer (2) of middle each device all connects the 3rd end of circulator (4) in the device, an input of the 3rd termination second coupler (3) of the circulator (4) in last device.
6. the device that is used for the described a kind of microwave signal frequency translation method based on optical fiber stimulated Brillouin scattering of claim 1, it is characterized in that: the light wave of laser (1) connects first end of first circulator (4) by first image intensifer (2), second end of first circulator (4) is through merging by coupler (3) with the 3rd end of first circulator (4) after intensity modulator (6) has been modulated low frequency/high-frequency microwave signal to be converted behind first optical fiber (5), insert photodetector (7) beat frequency takes place, obtain the high-frequency/low-frequency microwave signal, photodetector (7) is connected with spectrum analyzer (8).
7. the device of a kind of microwave signal frequency translation method based on optical fiber stimulated Brillouin scattering according to claim 6, it is characterized in that: at the 3rd end and coupler (3) the stimulated Brillouin scattering device that one or more structures are identical indirectly of described first circulator (4), this device comprises image intensifer (2), circulator (4) and optical fiber (5); First, second end of circulator (4) connects the output and the optical fiber (5) of image intensifer (2) respectively, the 3rd end of input termination first circulator (4) of the image intensifer (2) during wherein first installs, the input of the image intensifer (2) of middle each device all connects the 3rd end of the circulator (4) of a device, the 3rd end of the circulator (4) in last device connects an input of coupler (3) after intensity modulator (6) has been modulated low frequency/high-frequency microwave signal to be converted.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101483483B (en) * | 2009-01-08 | 2011-06-08 | 浙江大学 | Method and apparatus for generating multi-frequency microwave signal source |
| CN102546007A (en) * | 2011-12-30 | 2012-07-04 | 浙江大学 | Device and method for realizing frequency measurement of multifrequency microwave signals by using Brillouin scattering |
| CN103733547A (en) * | 2013-06-21 | 2014-04-16 | 华为技术有限公司 | Optical line terminal, optical network unit, optical network system and signal processing method |
| CN103872552A (en) * | 2014-01-24 | 2014-06-18 | 长春理工大学 | Ultra narrow linewidth tunable microwave signal source |
| CN110687733A (en) * | 2019-10-14 | 2020-01-14 | 吉林大学 | All-optical microwave photon frequency conversion method and device based on Brillouin scattering effect |
| CN114448509A (en) * | 2021-12-20 | 2022-05-06 | 军事科学院系统工程研究院网络信息研究所 | Communication network fixed machine physical interface implementation method based on photo-generated microwave chip |
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| CN100536373C (en) * | 2006-04-18 | 2009-09-02 | 浙江大学 | Microwave photon mixing method and device based on excited Brillouin scatter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101483483B (en) * | 2009-01-08 | 2011-06-08 | 浙江大学 | Method and apparatus for generating multi-frequency microwave signal source |
| CN102546007A (en) * | 2011-12-30 | 2012-07-04 | 浙江大学 | Device and method for realizing frequency measurement of multifrequency microwave signals by using Brillouin scattering |
| CN103733547A (en) * | 2013-06-21 | 2014-04-16 | 华为技术有限公司 | Optical line terminal, optical network unit, optical network system and signal processing method |
| WO2014201700A1 (en) * | 2013-06-21 | 2014-12-24 | 华为技术有限公司 | Optical line terminal, optical network unit, optical network system and signal processing method |
| CN103733547B (en) * | 2013-06-21 | 2016-08-31 | 华为技术有限公司 | Optical line terminal, optical network system and signal processing method |
| CN103872552A (en) * | 2014-01-24 | 2014-06-18 | 长春理工大学 | Ultra narrow linewidth tunable microwave signal source |
| CN103872552B (en) * | 2014-01-24 | 2016-11-23 | 长春理工大学 | Super-narrow line width adjustable microwave signal source |
| CN110687733A (en) * | 2019-10-14 | 2020-01-14 | 吉林大学 | All-optical microwave photon frequency conversion method and device based on Brillouin scattering effect |
| CN114448509A (en) * | 2021-12-20 | 2022-05-06 | 军事科学院系统工程研究院网络信息研究所 | Communication network fixed machine physical interface implementation method based on photo-generated microwave chip |
| CN114448509B (en) * | 2021-12-20 | 2024-06-04 | 军事科学院系统工程研究院网络信息研究所 | Communication network fixed machine physical interface realization method based on photo-generated microwave chip |
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