CN103095377B - A kind of 40GHz, 10Gbit/s high rate optical millimeter wave produces new method and device - Google Patents
A kind of 40GHz, 10Gbit/s high rate optical millimeter wave produces new method and device Download PDFInfo
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- CN103095377B CN103095377B CN201210595520.2A CN201210595520A CN103095377B CN 103095377 B CN103095377 B CN 103095377B CN 201210595520 A CN201210595520 A CN 201210595520A CN 103095377 B CN103095377 B CN 103095377B
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Abstract
In the day by day urgent situation of optical millimeter wave two-forty demand, for the aborning phase noise reduction of optical millimeter wave and data comparatively low rate problem, the present invention proposes a kind of 40GHz, 10Gbit/s high rate optical millimeter wave and produce new method and device, adopt two-forty, optical heterodyne formula optical millimeter wave generation subsystem to solve optical millimeter wave noise problem and data comparatively low rate problem.
Description
Art
The present invention relates to a kind of 40GHz, 10Gbit/s high rate optical millimeter wave and produce new method and device, can be applicable to the fields such as Microwave photonics, optical fiber communication, wireless intelligent acess, fiber optics.
Background technology
In recent years, the various wireless traffics such as mobile traffic, broadband streaming media constantly increase severely, and High rate and large capacity wireless communication needs increases day by day.In order to realize wireless broadband communication, its operating frequency must be improved.But, current most of wireless traffic both domestic and external all concentrates on below 3GHz, and existing low-frequency range frequency resource is nearly all occupied, frequency resource for more than 3GHz is generally less is applied to commercial system, particularly two propagation in atmosphere height loss windows of 24GHz and 60GHz frequency range are applied to experimental study mostly, commercial less.If this frequency range window business telecommunication can be made full use of, not only can make full use of existing frequency spectrum resource, but also the wireless access of ultra broadband can be realized.But, along with the raising of wireless broadband communication operating frequency, the complicated geographical environment such as high-rise, high mountain, forest increases owing to absorbing and reflecting the loss etc. caused gradually in electromagnetic reflection and shielding action and air, and makes the networking of wireless broadband network become complicated.For solving the problem, Fibre Optical Communication Technology and high frequency wireless access being merged the optical millimeter wave generation of getting up should need with velocity transmission communication technology Radio-over-Fiber (RoF) and give birth to.At present, optical millimeter wave produces has become as a kind of emerging communication technology grown up the study hotspot realizing ultra broadband and access with transmission technology.
The generation of optical millimeter wave is the important technology realizing high-property transmission.The generation of optical millimeter wave has multiple method, directly modulation technology [1 Hong Wen can be passed through, Lin Chen, Cheng Huang and Shuangchun Wen, A full-duplexradio-over-fiber system using direct modulation laser to generate optical millimeter-wave andwavelength reuse for uplink connection, Optics Communications, 2008, 281 (8): 2083-2088], based on single-side belt [2 W.H.Chen, and W.I.Way, " Multichannel Single-Sideband SCM/DWDM TransmissionSystem, " J.Lightwave Technol.22, 1679-1693 (2004), 3 C.Wu and X.Zhang, " Impact ofNonlinear Distortion in Radio Over Fiber Systems with Single-Sideband and TandemSingle-Sideband Subcarrier Modulations, " J.Lightwave Technol.24, 2076-2090 (2006)], double-side band [4 Ming-Fang Huang, Jianjun Yu, Zhensheng Jia, and Gee-Kung Chang, " Simultaneous Generationof Centralized Lightwaves and Double/Single Sideband Optical Millimeter-Wave Requiring OnlyLow-Frequency Local Oscillator Signals for Radio-Over-Fiber Systems, " J.Lightwave Technol.26, 2653-2662 (2008)], optical carrier suppression [5 J.Yu, Z.Jia, L.Yi, G.K.Chang, and T.Wang, " Opticalmillimeter wave generation or up-conversion using external modulators, " IEEE Photon.Technol.Lett.18, 265-267 (2006), 6 C.Lim, M.Attygalle, A.Nirmalathas, D.Novak, and R.Waterhouse, " Analysis of Optical Carrier-to-Sideband Ratio for Improving Transmission Performance inFiber-Radio Links, " IEEE T Microw Theory, 54,2181-2187 (2006), 7Qingjiang Chang, Tong Ye, and Yikai Su, " Generation of optical carrier suppressed-differential phase shift keying (OCS-DPSK) format using one dual-parallel Mach-Zehnder modulator in radio over fiber systems, " Opt.Express16, 10421-10426 (2008)] etc. external modulation technology, light heterodyne technology [8 R.P.Braun, G.Grosskopf, D.Rohde and F.Schmidt, " Optical millimetre-wave generation and transmission experiments for mobile 60GHzband communications ", Electronics Letters, 32 (7): 626-628 (1996), 9 Toshiaki Kuri and Ken-ichiKitayama, " Optical Heterodyne Detection Technique for Densely MultiplexedMillimeter-Wave-Band Radio-on-Fiber Systems, " J.Lightwave Technol.21,3167-(2003)] etc. realize.But, directly modulation is generally applicable to short distance, low frequency system [10 Jianxin Ma, Jianjun Yu, Chongxiu Yu, Zhensheng Ji, Gee-Kung Chang, Xinzhu Sang.The influence of fiber dispersion on the code formof the optical mm-wave signal generated by single sideband intensity-modulation.OpticsCommunications 271 (2007) 396-403], fading effect caused by the dispersion that the double-side band mode of external modulation easily causes signal, single-side belt and optical carrier suppression mode easily cause signal time domain to walk from [11 Jianxin Ma, Jianjun Yu, Chongxiu Yu, Xiangjun Xin, Qi Zhang.Transmission performance of the optical mm-wave generated bydouble-sideband intensity-modulation.Optics Communications 280 (2007) 317-326, 12 Jianxin Ma, Chongxiu Yu, Zhen Zhou, Jianjun Yu.Optical mm-wave generation by using external modulatorbased on optical carrier suppression.Optics Communications 268 (2006) 51-57].Light heterodyne technology is one more effective high frequency light millimeter wave generation technology, but usually has higher phase noise; In order to reduce and eliminate phase noise, have to introduce the subsystem of some complexity in the application of light heterodyne technology, as added complicated automatic frequency controls AFC subsystem [8], phase noise elimination circuit [9] etc. between central station and base station are compared with long span.
In view of optical millimeter wave system is to device performance parameter, Fiber-optic parameter etc. require harsh, current optical millimeter wave produces in experimental technique, most employing data comparatively low rate situation, as the OOK form optical millimeter wave signal 40GHz that carrier wave suppresses, [13 is really yellow for 2.5Gbit/s, Chen Lin, remaining for army building, Wen Shuanchun, single phase modulator is adopted to produce millimeter wave, Chinese laser, 2008, 35 (1): 73-4], OOK optical millimeter wave signal 40GHz, 2.5Gbit/s [14 literary composition letters, Chen Lin, Pi Yazhi, remaining for army building, Wen Shuanchun, the full duplex fibre-optical radio communication system of optical millimeter wave is produced based on phase-modulator, Chinese laser, 2007, 34 (7): 73-4], OOK form optical millimeter wave signal 56GHz, [15 bright for 2.8Gbit/s, remaining foundation, Cao Zizheng, Chen Lin, the light carrier radio communication system of 56GHz millimeter wave is produced based on phase-modulator frequency doubling technology, photoelectron. laser, 2010, 21 (4): 547-550], light carries OFDM millimeter-wave signal 40GHz, 2.5Gbit/s [16 Xia Minmin, Dong Ze, Cao Zizheng, Zhang Yimin, Chen Lin, the transmission performance that optical phase modulator and light intensity modulator generation 40GHz light carry OFDM millimeter-wave signal compares, Acta Optica, 2010, 30 (6): 1586-6], DPSK optical millimeter wave 20GHz, 1.25Gbit/s [17Q.Chang, T.Ye, and Y.Su, " Generation of optical carriersuppressed-differential phase shift keying (OCS-DPSK) format using one dual-parallelMach-Zehnder modulator in radio over fiber systems, " Opt.Express 16, 10421-10426 (2008)], OFDM optical millimeter wave 19GHz, 4Gbit/s [18 C.Lin, Y.Lin, J. (J.) Chen, S.Dai, P.T.Shih, P.Peng, and S.Chi, " Optical direct-detection OFDM signal generation for radio-over-fiber link using frequencydoubling scheme with carrier suppression, " Opt.Express 16, 6056-6063 (2008)], QPSK optical millimeter wave 60GHz, 3Gbit/s [19 Anthony Ng ' oma, Davide Fortusini, Devang Parekh, Weijian Yang, MichaelSauer, Seldon Benjamin, Werner Hofmann, Markus C.Amann, and Connie J.Chang-Hasnain, " Performance of a Multi-Gb/s 60GHz Radio Over Fiber System Employing a Directly ModulatedOptically Injection-Locked VCSEL, " J.Lightwave Technol.28, 2436-2444 (2010)], ASK optical millimeter wave 60GHz, 2Gbit/s [19].But China is vast in territory, populous, information communication demand rapid growth, the demand that high rate optical millimeter wave produces becomes day by day urgent.
As can be seen here, explore optical millimeter wave and produce the most important thing that new method is optical millimeter wave generation research, solution phase noise reduction and data are the aborning key points of optical millimeter wave compared with low rate problem innovatively.
Content of the patent
In the day by day urgent situation of optical millimeter wave two-forty demand, for the aborning phase noise reduction of optical millimeter wave and data comparatively low rate problem, the present invention proposes a kind of 40GHz, 10Gbit/s high rate optical millimeter wave and produce new method and device, intend adopting two-forty, optical heterodyne formula optical millimeter wave generation subsystem to solve optical millimeter wave noise problem and data comparatively low rate problem.
The technical solution adopted for the present invention to solve the technical problems is:
The present invention proposes a kind of 40GHz, 10Gbit/s high rate optical millimeter wave and produce new method and device, intend the technical scheme adopted: the 10Gbit/s two-forty NRZ pseudo-random pulse sequence date number that the pattern generating unit E4868 of Agilent 43Gbit/s Error Detector 81250 exports (comprises clock in data; SDH packet makes this research approach have extremely important meaning containing clock), the laser modulating the generation of narrow linewidth Distributed Feedback Laser is removed through a 40G high-speed wideband modulator, thus produce two-forty wide-band modulation spectrum, this spectrum is through shunt, wherein a road spectrum leaches clock multiple frequence spectrum through filter, and the clock multiple frequence spectrum leached closes rood to required high rate optical millimeter wave with another road two-forty wide-band modulation light through mixer after light amplification.
The invention has the beneficial effects as follows:
A kind of 40GHz, 10Gbit/s high rate optical of the present invention millimeter wave produces new method and device; Because adopting same DFB LASER Light Source to produce optical millimeter wave, effectively inhibit phase noise; The DFB laser adopted has narrow linewidth, High Extinction Ratio characteristic, effectively inhibits intensity noise; The 10Gbit/s high data rate adopting Error Detector 81250 to export goes modulation DFB light source to improve data rate by a wideband modulator.As compared to the production method and document [8-9] that adopt radio frequency and baseband signal difference phase modulation and intensity two kinds of modulators, optical millimeter wave of the present invention produces scheme novelty, simple possible, high data rate, effectively restraint speckle.The fields such as the present invention is Microwave photonics, optical fiber communication, wireless intelligent acess, fiber optics are furtherd investigate further and are provided support.
Accompanying drawing explanation
The present invention proposes a kind of 40GHz, 10Gbit/s high rate optical millimeter wave and produce new method and device, intend adopting the technical scheme shown in Fig. 1 to suppress the aborning noise of optical millimeter wave, improve data rate.In Fig. 1,1 is high rate error instrument 81250,2 is 40G high-speed wideband modulators, and 3 is narrow linewidth Distributed Feedback Lasers, and 4 is splitters 50: 50,5 is filter (filter clock multiple frequence light), 6 is image intensifers, and 7 is high-speed wideband light modulated, and 8 is mixers 50: 50,9 is required optical millimeter waves, and 10 is that measuring instrument is (as Error Detector 81250, electric spectrometer E4440A, spectrometer AQ6319, oscilloscope DSA8300, SHG-FROG pulse analyzer etc.; Measurement and analysis for the various parameters of optical millimeter wave), in figure, 11 is the spectrum after spectrometer AQ6319 scans the modulation of 10Gbit/s high data rate.
It is the eye pattern recorded with oscilloscope DSA8300 after 10Gbit/s high data rate modulated spectrum enlarge leadingly shown in Fig. 2.Can be obtained by Fig. 2, signal quality is good, its extinction ratio 9.31dB, and r.m.s. noise 121.47 μ W, signal to noise ratio is 31.02, and r.m.s. is dithered as 1.409ps.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described with enforcement.
Shown in Fig. 1, the 10Gbit/s two-forty NRZ pseudo-random pulse sequence date number that the pattern generating unit E4868 of Agilent 43Gbit/s Error Detector 81250 (1) exports (comprises clock in data, SDH packet makes this research approach have extremely important meaning containing clock), through the laser (OOK form) that a 40G high-speed wideband modulator (2) goes modulation narrow linewidth Distributed Feedback Laser (3) to produce, thus the spectrometer scanning optical spectrum (in figure, spectrum is the spectrum after the modulation of 10Gbit/s high data rate) in generation figure shown in (11), this spectrum through splitter (4) along separate routes, wherein a road spectrum leaches clock multiple frequence spectrum (40GHz) through filter (5), the clock multiple frequence spectrum leached closes rood to required high rate optical millimeter wave (9) with another road two-forty wide-band modulation light (7) through mixer (8) after light amplification (6).High rate optical Millimeter Wave via measuring instrument (10) carries out the Measurement and analysis of the various parameters of optical millimeter wave, as the pattern of Error Detector 81250 for optical millimeter wave produces and Error detection, electricity spectrometer E4440A is used for the electricity spectrum Performance Detection of optical millimeter wave, spectrometer AQ6319 detects for the spectrum property of optical millimeter wave, oscilloscope DSA8300 is used for the data eye, noise dither etc. of optical millimeter wave, and SHG-FROG pulse analyzer is used for the information measurements such as optical millimeter wave impulse waveform, phase place.
The difference of clock multiple frequence spectral centroid wavelength and two-forty wide-band modulation center wavelength of light is required millimeter wave frequency, in figure, (11) are visible, spectrum after 10Gbit/s high rate modulation contains the multiple frequence clock spectrum (having marked 40GHz in figure) of 10GHz clock, thus can exploratory development high rate optical millimeter wave situation.It is the eye pattern recorded with oscilloscope DSA8300 after 10Gbit/s high data rate modulated spectrum (7) enlarge leadingly shown in Fig. 2.Can be obtained by Fig. 2, signal quality is good, its extinction ratio 9.31dB, and r.m.s. noise 121.47 μ W, signal to noise ratio is 31.02, and r.m.s. is dithered as 1.409ps.
Adopt same DFB LASER Light Source to produce optical millimeter wave, effectively can suppress phase noise; The DFB laser adopted has narrow linewidth, High Extinction Ratio characteristic, can effective inhibition strength noise; The 10Gbit/s high data rate adopting Error Detector 81250 to export goes modulation DFB light source to improve data rate by a wideband modulator.As compared to the production method and document [8-9] that adopt radio frequency and baseband signal difference phase modulation and intensity two kinds of modulators, optical millimeter wave of the present invention produces scheme novelty, simple possible, high data rate, effectively restraint speckle.The important references of the high bit rate optical millimeter wave situation that this patent method and apparatus can be used as high bit rate optical millimeter wave situation (20GHz-60GHz) that exploratory development selects different multiple frequence clock spectrum to be formed, exploratory development selects different modulating speed 5Gbit/s-40Gbit/s to be formed.Can be applicable to the fields such as Microwave photonics, optical fiber communication, wireless intelligent acess, fiber optics.
Claims (2)
1. 40GHz, 10Gbit/s high rate optical millimeter wave generating method: Agilent Error Detector 81250 exports 10Gbit/s high rate data signals, the laser modulating the generation of narrow linewidth Distributed Feedback Laser is removed through a 40G high-speed wideband modulator, thus produce two-forty wide-band modulation spectrum, this spectrum is through shunt, wherein a road spectrum leaches clock multiple frequence spectrum through filter, and the clock multiple frequence spectrum leached closes rood to required high rate optical millimeter wave with another road two-forty wide-band modulation light through mixer after light amplification; The difference of clock multiple frequence spectral centroid wavelength and two-forty wide-band modulation center wavelength of light is required millimeter wave frequency.
2. the system of method according to claim 1, it comprises Agilent 43Gbit/s Error Detector 81250,40G high-speed wideband modulator, narrow linewidth Distributed Feedback Laser, splitter, filter, image intensifer, mixer, electric spectrometer E4440A, spectrometer AQ6319, oscilloscope DSA8300, SHG-FROG pulse analyzer, it is characterized in that: the 10Gbit/s two-forty NRZ pseudo-random pulse sequence date number of the pattern generating unit E4868 output of Agilent 43Gbit/s Error Detector 81250 (1), through the laser that a 40G high-speed wideband modulator (2) goes modulation narrow linewidth Distributed Feedback Laser (3) to produce, thus produce spectrometer AQ6319 institute scanning optical spectrum, this spectrum through splitter (4) along separate routes, wherein a road spectrum leaches clock multiple frequence spectrum through filter (5), the clock multiple frequence spectrum leached closes rood to required high rate optical millimeter wave (9) with another road two-forty wide-band modulation light (7) through mixer (8) after light amplification (6), high rate optical Millimeter Wave via measuring instrument (10) carries out the Measurement and analysis of the various parameters of optical millimeter wave, specifically comprise: adopt Error Detector 81250 to produce and Error detection for the pattern of optical millimeter wave, electricity spectrometer E4440A is used for the electricity spectrum Performance Detection of optical millimeter wave, spectrometer AQ6319 detects for the spectrum property of optical millimeter wave, oscilloscope DSA8300 is used for data eye, the noise dither detection of optical millimeter wave, and SHG-FROG pulse analyzer is used for optical millimeter wave impulse waveform, phase information is measured.
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| CN101001121A (en) * | 2007-01-09 | 2007-07-18 | 湖南大学 | Simple structure mm wave demodulation method and system of radio-on-fibre communication |
| CN101000411A (en) * | 2006-09-14 | 2007-07-18 | 余建军 | Method and device for generating millimeter wave by directly regulating laser |
| CN101094038A (en) * | 2006-06-23 | 2007-12-26 | 湖南大学 | Method and device for generating millimeter wave and reuse of wavelength in optical fiber wireless communication system |
| CN102546016A (en) * | 2010-12-13 | 2012-07-04 | 湖南大学 | Radio-on-fiber communication system based on differential phase shift keying format |
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| CN101094038A (en) * | 2006-06-23 | 2007-12-26 | 湖南大学 | Method and device for generating millimeter wave and reuse of wavelength in optical fiber wireless communication system |
| CN101000411A (en) * | 2006-09-14 | 2007-07-18 | 余建军 | Method and device for generating millimeter wave by directly regulating laser |
| CN101001121A (en) * | 2007-01-09 | 2007-07-18 | 湖南大学 | Simple structure mm wave demodulation method and system of radio-on-fibre communication |
| CN102546016A (en) * | 2010-12-13 | 2012-07-04 | 湖南大学 | Radio-on-fiber communication system based on differential phase shift keying format |
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