CN1835422A - Microwave photon down conversion method and device based on electrooptical modulator and optical fiber raster - Google Patents
Microwave photon down conversion method and device based on electrooptical modulator and optical fiber raster Download PDFInfo
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- CN1835422A CN1835422A CNA200610050399XA CN200610050399A CN1835422A CN 1835422 A CN1835422 A CN 1835422A CN A200610050399X A CNA200610050399X A CN A200610050399XA CN 200610050399 A CN200610050399 A CN 200610050399A CN 1835422 A CN1835422 A CN 1835422A
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Abstract
Through electro optic modulator, local oscillation signal in double sideband is generated at controller of base station. Through filtering by grating of optical fiber, base station end obtains local oscillation signal in single sideband restrained by carrier. Through electro optic modulator, base station end carries out full photomixing between radio-frequency signal and local oscillation signal in single sideband. Through up going optical fiber link, the mixed optical signal is transferred to the controller of base station. Through photo detector and intermediate frequency filter, the controller of base station obtains signal in intermediate frequency of passing through down-conversion. Base station does not need local laser and local oscillation source of microwave, which are centralized at controller of base station. Thus, cost of system is lowered greatly. The invention prevents influence on quality of signal from effect of optical fiber dispersion, and raises SNR of system.
Description
Technical field
The present invention relates to optical communication and wireless communication field, relate in particular to a kind of microwave photon down conversion method and device based on electrooptic modulator and fiber grating.
Background technology
In recent years, Radio over Fiber (RoF) technology has caused widely to be paid attention to, RoF is a kind of subcarrier multiplexing of analog-modulated, and it is in the connecting system of wireless/mobile communication system, be widely used in control of military antenna remote and intelligent transportation system.RoF uses in wireless/mobile communication system, can focus on moving on to the base station controller end after the Base-Band Processing of base station end, modulation, the mixing function, and the base station end only keeps opto-electronic conversion, filtering and enlarging function, can reduce the cost of base station greatly like this, in the intensive microcellulor communication system in future, because base station number is numerous, adopt the RoF technology can reduce the cost of system greatly.
Owing to using value potential in the microwave/millimeter wave fibre system, the converter technique on the light territory (being so-called microwave photon converter technique) has caused numerous researchers' interest.Handle based on the microwave signal of electronic equipment compared with tradition, the benefit of microwave photon frequency conversion is that crosstalking of time-bandwidth product height, anti-electromagnetic interference, circuit and equipment room is little, the most important thing is that the microwave photon converter technique is on the light territory microwave signal to be handled, it can with the natural couplings of microwave/millimeter wave fiber optic transmission system such as RoF, the centre need not photoelectricity and electric light conversion equipment.
A key areas of microwave photon frequency conversion is in the base station access system of mobile communication system, in this system, base station controller sends downstream signal by downlink optical fiber chain road direction base station, and the base station sends upward signal by uplink optical fibers chain road direction base station controller.So far, be used to realize that the main method of RoF system photon frequency conversion function has: based on the photon frequency conversion system of electrooptic modulator, based on the frequency conversion system of two relevant lasers with based on the photon converter technique of being excited deep scattering.At J.Marti, et al, " SingleMach-Zehnder modulator electro-optic harmonic mixer for broadbandmicrowave/millimetre-wave applications; " Wireless Personal Communications, Vol.15,2000, pp31-42 has provided a kind of microwave photon conversion method based on electrooptic modulator, radiofrequency signal and local oscillation signal are realized photon mixing and frequency conversion in this locality by electrooptic modulator from an input feed-in electrooptic modulator in this method.At G.J.Simonis and K.G.Purchase, " Optical generation; distribution and control of microwaves using heterodyne; " IEEE Transaction onMicrowave Theory and Techniques, Vol.38,1990, pp667-669 provides the technology that provides photon mixing by coherent laser, wherein need two lasers with certain frequency difference, two lasers need could be realized relevant by complicated lock-in techniques here.At Y.Shen, X.Zhang and K.Chen, " All-optical generation of microwave and millimetre wave using a two-frequencyBragg grating-based Brillouin fiber laser. " Journal of Lightwave Technology, Vol.23, No.5,2005, in the method that pp1860-1867 provides, utilize the double frequency Brillouin laser to produce generation and frequency conversion that the 11GHz frequency difference realizes signal.In said method, frequency conversion system implementation method more complicated based on the frequency conversion system and the Brillouin laser of coherent laser, the cost that is used for intensive microcellular mobile communication system is higher, and above-mentioned conversion method based on electrooptic modulator, though cost is lower, but the function that realizes is limited, can only produce frequency variation signal in this locality, then can't realize for the uplink optical fibers link frequency conversion function of mobile communication base station connecting system.
Summary of the invention
The object of the present invention is to provide a kind of microwave photon down conversion method and device, adopt the system configuration mode of base station controller end device and base station end device, realize the remote signaling frequency down-conversion function jointly based on electrooptic modulator and fiber grating.
The present invention is directed to the deficiencies in the prior art, a kind of new microwave photon conversion method is proposed, be applied in the base station access system of mobile communication system, compared with existing microwave photon conversion method, the present invention is specially adapted to the far-end down-conversion of microwave photon up link, can reduce the complexity of system greatly.The fiber grating that the present invention passes through to place at the base station end will extract from the local oscillation signal that the base station controller end transmits, and local oscillation signal can be converted to the single side-band modulator signal from double-sideband modulation as narrow band filter.So on the one hand, owing to be single-side band modulation, thereby can offset the adverse effect of optical fiber link chromatic dispersion, and fiber grating has possessed the function of carrier suppressed, thereby can improve the signal to noise ratio of transmission signals, the local on the other hand monolateral band local oscillation signal that extracts can be directly as base station end optical signal source, thereby the base station end need not to use laser light source, realizes down-conversion simultaneously and the function of light signal is provided.In order to realize such purpose, the present invention has designed the system configuration mode of base station controller end and base station end respectively, and they realize the remote signaling frequency down-conversion function of up link jointly.
The major function of the base station controller end device that is used for full optical fiber remote microwave photon converter technique that the present invention provides be for the base station microwave local oscillation signal is provided and receive bring in from the base station obtain intermediate-freuqncy signal through the light signal signal of mixing and through filtering.For realizing such purpose, the base station controller end is characterised in that the microwave local oscillation signal is input to electrooptic modulator by microwave signal behind amplifier, will modulate the base station of going up double-side band microwave local oscillation signal and sending to far-end by down link by the light wave that semiconductor laser produces.In addition, the microwave photon of the mixing signal that is produced by the base station end is converted to microwave signal by photo-detector, and obtains required intermediate-freuqncy signal through intermediate-frequency filter.
The technical solution adopted for the present invention to solve the technical problems is:
One, based on the microwave photon down conversion method of electrooptic modulator and fiber grating:
The double-side band local oscillation signal produces by electrooptic modulator and is sent to the base station end by the downlink optical fiber link at the base station controller end, and the base station end need not lasing light emitter and local vibration source, and can obtain monolateral band local oscillation signal through carrier suppressed by fiber grating filtering; Full photomixing takes place by electrooptic modulator with radiofrequency signal and monolateral band local oscillation signal in the base station end, optical signals uplink optical fibers link through mixing is sent to the base station controller end, obtains the intermediate-freuqncy signal of process down-conversion through photodetector and intermediate-frequency filter at the base station controller end.
Two, based on the microwave photon down conversion device of electrooptic modulator and fiber grating:
Comprise the base station controller end device of forming by semiconductor laser, microwave amplifier, first electrooptic modulator, photodetector and intermediate-frequency filter, the base station end device of forming by three ports light rings, fiber grating, image intensifer, second electrooptic modulator, antenna for base station and radio frequency amplifier; Wherein:
The input termination microwave local oscillation signal input part of microwave amplifier, the rf inputs of the output termination electrooptic modulator of microwave amplifier, the light wave of semiconductor laser output connects the input of first electrooptic modulator, the output of first electrooptic modulator connects first end of three ports light rings through the downlink optical fiber link, the second terminated optical fiber grating of three ports light rings, the 3rd end of input termination three ports light rings of image intensifer, the input of output termination second electrooptic modulator of image intensifer, the output of second electrooptic modulator connects the input of photodetector through the uplink optical fibers link, intermediate-frequency filter is connected with the output of photodetector and the delivery outlet of intermediate-freuqncy signal respectively, and radio frequency amplifier is connected with antenna for base station with the rf inputs of second electrooptic modulator respectively.
The present invention compares with background technology, and the beneficial effect that has is:
The present invention is directed to existing microwave photon Application of frequency conversion technique in the defective of mobile communication base station connecting system, a kind of conversion method is proposed, be applied in the last walking along the street link of mobile communication base station connecting system, this method can realize the far-end frequency conversion, the base station end need not local laser and microwave local oscillator, and laser and microwave local oscillator concentrate on the base station controller end, and this mode can reduce the cost of system significantly, especially in the intensive microcellular mobile communication system in future.The present invention has utilized the narrow-band filtering effect of fiber grating, utilizes grating can produce the monolateral band local oscillation signal of process carrier suppressed, has avoided fiber dispersion effects also can improve the signal to noise ratio of system to the influence of signal quality.
Description of drawings
Fig. 1 is a structural representation of the present invention.Solid line is represented the light signal link among Fig. 1, and dotted line is represented signal of telecommunication link.
Fig. 2 is that the fiber grating that utilizes that the present invention proposes is realized the schematic diagram of monolateral band filtering and carrier suppressed function.
Among the figure: 1. semiconductor laser, 2. microwave local oscillation signal input part, 3. microwave amplifier, 4. first electrooptic modulator, 5. photodetector, 6. intermediate-frequency filter, 7. intermediate-freuqncy signal delivery outlet, 8. downlink optical fiber link, 9. three ports light rings, 10. fiber grating, 11. image intensifer, 12. second electrooptic modulator, 13. antenna for base station, 14. radio frequency amplifiers, 15. uplink optical fibers link, 16. the spectrogram of input double-side band local oscillation signal, the corresponding diagram of 17. fiber grating reflectance spectrums and double-side band local oscillation signal spectrum, the spectrogram of the monolateral band local oscillation signal of 18. monolateral band filtering of process and carrier suppressed.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the structural representation of the microwave photon down conversion device of electrooptic modulator of the present invention and fiber grating.Solid line is represented the light signal link among Fig. 1, and dotted line is represented signal of telecommunication link.The empty frame table in the left side shows the base station controller end device among Fig. 1, and the empty frame table in the right shows the base station end device.The function of base station controller end device mainly comprises: with the microwave local oscillation signal be modulated on the light carrier and offer far-end the base station, receive come from the base station through the light signal of photomixing and leach intermediate-freuqncy signal.The major function of base station end device comprises: utilize double-side band microwave local oscillation conversion of signals that fiber grating will bring in from base station controller for the monolateral band local oscillation signal of carrier suppressed, utilize electrooptic modulator that radiofrequency signal and monolateral band local oscillator light signal full photomixing are taken place and the light signal after the mixing is sent to base station controller by the uplink optical fibers link.
As shown in Figure 1, the present invention includes: the base station controller end device of forming by semiconductor laser 1, microwave amplifier 3, first electrooptic modulator 4, photodetector 5 and intermediate-frequency filter 6, the base station end device of forming by three ports light rings 9, fiber grating 10, image intensifer 11, second electrooptic modulator 12, antenna for base station 13 and radio frequency amplifier 14; Wherein:
The input termination microwave local oscillation signal input part 2 of microwave amplifier 3, the rf inputs of the output termination electrooptic modulator 4 of microwave amplifier 3, the light wave of semiconductor laser 1 output connects the input of first electrooptic modulator 4, the output of first electrooptic modulator 4 connects first end of three ports light rings 9 through downlink optical fiber link 8, the second terminated optical fiber grating 10 of three ports light rings 9, the 3rd end of input termination three ports light rings 9 of image intensifer 11, the input of output termination second electrooptic modulator 12 of image intensifer 11, the output of second electrooptic modulator 12 connects the input of photodetector 5 through uplink optical fibers link 15, intermediate-frequency filter 6 is connected with the output of photodetector 5 and the delivery outlet 7 of intermediate-freuqncy signal respectively, and radio frequency amplifier 14 is connected with antenna for base station 13 with the rf inputs of second electrooptic modulator 12 respectively.
Operation principle of the present invention is as follows:
The light signal that semiconductor laser 1 sends is as the light source that carries local oscillation signal, the microwave local oscillation signal is imported after microwave amplifier 3 amplifies from microwave local oscillation signal input part 2, be modulated on the light signal through first electrooptic modulator 4 then, modulated microwave local oscillation double-sideband signal is sent to the base station end through downlink optical fiber link 8.The photodetector 5 of the light signal input base station controller end of bringing in from the base station, output is through the intermediate-freuqncy signal of frequency conversion behind intermediate-frequency filter 6.The double-sideband modulation microwave local oscillation signal of bringing in from base station controller is input to the fiber grating 10 that is operated in reflective-mode behind three port circulators 9, because the filter action of fiber grating 10, the microwave local oscillation conversion of signals of double-sideband modulation is the single sideband singal of carrier suppressed, be input to image intensifer 11 through three port circulators 9 then, single-side band modulation microwave local oscillation light signal through image intensifer 11 is input to second electrooptic modulator 12 as light source, then behind the radiofrequency signal process radio frequency amplifier 14 of antenna for base station 13, import on second electrooptic modulator 12 through the radiofrequency signal of amplifying, on this electrooptic modulator 12, full photomixing takes place in radiofrequency signal and monolateral band local oscillation signal, be sent to the photodetector 5 of base station controller end through the light signal of mixing by uplink optical fibers link 15, can extract microwave intermediate-freuqncy signal through intermediate frequency filtering 6 then through frequency conversion.
The present invention realizes double-side band microwave local oscillation conversion of signals is single sideband singal by the narrow-band filtering function of utilizing fiber grating, for the effect of fiber grating is described better, Fig. 2 has provided the fiber grating that utilizes that proposes for the present invention and has realized the schematic diagram of monolateral band filtering and carrier suppressed function.
The spectrogram of the light signal of the modulated microwave local oscillation signal that is sent by the base station controller end is as 16, owing to be the double-sideband modulation signal, spectrum comprises carrier wave and last, following two sidebands, this double-sideband signal is input to the fiber grating 10 that is operated in reflective-mode after three ports light rings 9, in order to leach a sideband and suppressed carrier, the grating reflection peak need be aimed at one of them sideband, the corresponding diagram of fiber grating reflectance spectrum and double-side band local oscillation signal spectrum is shown in 17, the frequency spectrum of the monolateral band local oscillation signal of monolateral band filtering of process and carrier suppressed is as 18, and this local oscillation signal offers light source and the local vibration source of the electrooptic modulator of base station as the base station after image intensifer 11 amplifies.The reflectance spectrum that it is pointed out that fiber grating must be complementary with the local frequency that needs transmit, required grating in the system, and the three dB bandwidth of its reflectance spectrum is about half of microwave local oscillation frequency, and this fiber grating can have been bought from market.The photoelectric device that all are used among the present invention also can have been bought from market.
Claims (2)
1. microwave photon down conversion method based on electrooptic modulator and fiber grating, it is characterized in that: the double-side band local oscillation signal is sent to the base station end at the base station controller end by the electrooptic modulator generation and by the downlink optical fiber link, the base station end need not lasing light emitter and local vibration source, and can obtain monolateral band local oscillation signal through carrier suppressed by fiber grating filtering; Full photomixing takes place by electrooptic modulator with radiofrequency signal and monolateral band local oscillation signal in the base station end, optical signals uplink optical fibers link through mixing is sent to the base station controller end, obtains the intermediate-freuqncy signal of process down-conversion through photodetector and intermediate-frequency filter at the base station controller end.
2. microwave photon down conversion device based on electrooptic modulator and fiber grating, it is characterized in that comprising: the base station controller end device of forming by semiconductor laser (1), microwave amplifier (3), first electrooptic modulator (4), photodetector (5) and intermediate-frequency filter (6), the base station end device of forming by three ports light rings (9), fiber grating (10), image intensifer (11), second electrooptic modulator (12), antenna for base station (13) and radio frequency amplifier (14); Wherein:
The input termination microwave local oscillation signal input part (2) of microwave amplifier (3), the rf inputs of the output termination electrooptic modulator (4) of microwave amplifier (3), the light wave of semiconductor laser (1) output connects the input of first electrooptic modulator (4), the output of first electrooptic modulator (4) connects first end of three ports light rings (9) through downlink optical fiber link (8), the second terminated optical fiber grating (10) of three ports light rings (9), the 3rd end of input termination three ports light rings (9) of image intensifer (11), the input of output termination second electrooptic modulator (12) of image intensifer (11), the output of second electrooptic modulator (12) connects the input of photodetector (5) through uplink optical fibers link (15), intermediate-frequency filter (6) is connected with the output of photodetector (5) and the delivery outlet (7) of intermediate-freuqncy signal respectively, and radio frequency amplifier (14) is connected with antenna for base station (13) with the rf inputs of second electrooptic modulator (12) respectively.
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| CN101738817B (en) * | 2009-12-16 | 2012-10-31 | 北京交通大学 | Device for generating millimeter wave through direct modulation and direct wave detection based on triangular Bragg grating |
| CN102324892B (en) * | 2011-08-16 | 2014-03-26 | 北京邮电大学 | High-frequency microwave signal full-gloss down conversion system |
| CN102324892A (en) * | 2011-08-16 | 2012-01-18 | 北京邮电大学 | High-frequency microwave signal full-gloss down conversion system |
| CN102520487A (en) * | 2011-12-15 | 2012-06-27 | 北京交通大学 | Flat microwave photonic filter based on Mach-Zehnder modulator and frequency converter |
| CN102571144A (en) * | 2012-01-11 | 2012-07-11 | 中国科学院半导体研究所 | Optical-carrier ultra wideband radio signal generator with tunable frequency band |
| CN102571144B (en) * | 2012-01-11 | 2013-11-06 | 中国科学院半导体研究所 | Optical-carrier ultra wideband radio signal generator with tunable frequency band |
| CN103427906B (en) * | 2013-08-16 | 2016-08-10 | 北京邮电大学 | A kind of system and method utilizing photon converter technique transmission multi-service signal |
| CN103427906A (en) * | 2013-08-16 | 2013-12-04 | 北京邮电大学 | System and method for transmitting multi-service signal by utilizing photon frequency conversion technology |
| CN103888191A (en) * | 2014-03-19 | 2014-06-25 | 北京邮电大学 | Microwave photon down-conversion method based on bi-directional utilization of phase modulator |
| CN104216196A (en) * | 2014-08-27 | 2014-12-17 | 西安空间无线电技术研究所 | Tunable all-optical microwave photon frequency conversion device without external electric local oscillator |
| CN105099568A (en) * | 2014-11-18 | 2015-11-25 | 航天恒星科技有限公司 | Microwave photon modulation method and device |
| CN104683035A (en) * | 2015-02-05 | 2015-06-03 | 北京大学 | Optical down-conversion method and system for high-frequency narrowband signal |
| CN104683035B (en) * | 2015-02-05 | 2017-08-04 | 北京大学 | A kind of light down conversion method and system for high-frequency narrow-band signal |
| CN106685535A (en) * | 2017-01-16 | 2017-05-17 | 电子科技大学 | Down-conversion method of reconfigurable microwave photonics and down-conversion device of the same |
| CN107340666A (en) * | 2017-06-08 | 2017-11-10 | 浙江大学 | A kind of vector signal means of upconversion based on optical-electronic oscillator |
| CN107340666B (en) * | 2017-06-08 | 2019-07-09 | 浙江大学 | A kind of vector signal means of upconversion based on optical-electronic oscillator |
| CN113810125A (en) * | 2021-08-26 | 2021-12-17 | 广东工业大学 | Multi-band microwave photon frequency conversion system based on optical frequency comb |
| CN113810125B (en) * | 2021-08-26 | 2022-06-17 | 广东工业大学 | Multi-band microwave photon frequency conversion system based on optical frequency comb |
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