CN203352605U - Light millimeter wave generating device with high bit rate - Google Patents
Light millimeter wave generating device with high bit rate Download PDFInfo
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- CN203352605U CN203352605U CN 201220752845 CN201220752845U CN203352605U CN 203352605 U CN203352605 U CN 203352605U CN 201220752845 CN201220752845 CN 201220752845 CN 201220752845 U CN201220752845 U CN 201220752845U CN 203352605 U CN203352605 U CN 203352605U
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Abstract
Provided is a light millimeter wave generating device with a high bit rate. An NRZ pseudorandom impulse sequence with the high bit rate of 10 Gbit/s output by a code pattern generating part E4868 of an Agilent 43 Gbit/s bit error tester 81250 is used as a data signal, and a 40G high-speed wide band modulator is used for modulating continuous lasers generated by a narrow linewidth DFB laser, so a modulation spectrum is generated; the spectrum is shunted by a coupler, a 40 GHz clock multi-frequency doubling spectrum is filtered out from one of spectra via a filter, and after passing through a light amplifier, the clock multi-frequency spectrum is combined with the other one of high-bit rate wide band modulation spectrum via a coupler, so the needed millimeter wave is obtained; and the frequency of the needed millimeter wave is the difference value of the central wavelength of the clock multi-frequency doubling spectrum and the central wavelength of the high-bit rate wide band modulation light.
Description
Affiliated technical field
Present patent application relates to a kind of high bit rate optical millimeter wave generating device, can be applicable to the fields such as Microwave photonics, optical fiber communication, the access of wireless optical fiber, fiber optics.
Background technology
In recent years, the various wireless traffics such as mobile traffic, broadband streaming media constantly increase severely, and the large capacity wireless communication needs of high bit rate increases day by day.In order to realize wireless broadband communication, must improve its operating frequency.Yet, most of wireless traffics both domestic and external all concentrate on below 3GHz at present, and existing low-frequency range frequency resource is nearly all occupied, for the general less commercial system that is applied to of the frequency resource more than 3GHz, particularly the high loss window of two propagation in atmosphere of 24GHz and 60GHz frequency range is applied to experimental study mostly, commercial less.If can take full advantage of this frequency range window business telecommunication, not only can take full advantage of existing frequency spectrum resource, but also can realize the wireless access of ultra broadband.But, raising along with the wireless broadband communication operating frequency, the complicated geographical environments such as high-rise, high mountain, forest in electromagnetic reflection and shielding action and atmosphere because absorb and loss that reflection causes etc. increases gradually, and make the networking of wireless broadband network become complicated.For addressing the above problem, the optical millimeter wave that Fibre Optical Communication Technology and high frequency wireless access are merged produces with velocity transmission communication technology Radio-over-Fiber (RoF) and should need and give birth to.At present, optical millimeter wave produces has become the study hotspot of realizing the ultra broadband access as a kind of emerging communication technology grown up with transmission technology.
The generation of optical millimeter wave is the important technology of realizing high-property transmission.The generation of optical millimeter wave has several different methods, can be by direct modulation technique [1Hong Wen, Lin Chen, Cheng Huang and Shuangchun Wen, A full-duplex radio-over-fiber system using direct modulation laser to generate optical millimeter-wave and wavelength reuse for uplink connection, Optics Communications, 2008, 28l (8): 2083-2088], based on single-side belt [2W.H.Chen, and W.I.Way, " Multichannel Single-Sideband SCM/DWDM Transmission System, " J.Lightwave Technol.22, 1679-1693 (2004), 3C.Wu and X.Zhang, " Impact of Nonlinear Distortion in Radio Over Fiber Systems with Single-Sideband and Tandem Single-Sideband Subcarrier Modulations, " J.Lightwave Technol.24, 2076-2090 (2006)], double-side band [4Ming-Fang Huang, Jianjun Yu, Zhensheng Jia, and Gee-Kung Chang, " Simultaneous Generation of Centralized Lightwaves and Double/Single Sideband Optical Millimeter-Wave Requiring Only Low-Frequency Local Oscillator Signals for Radio-Over-Fiber Systems, " J.Lightwave Technol.26.2653-2662 (2008)], optical carrier suppression [5J.Yu, Z.Jia, L.Yi, G.K.Chang, and T.Wang, " Optical millimeter wave generation or up-conversion using external modulators, " IEEE Photon.Technol.Lett.18, 265-267 (2006), 6C.Lim, M.Attygalle, A.Nirmalathas, D.Novak, and R.Waterhouse, " Analysis of Optical Carrier-to-Sideband Ratio for Improving Transmission Performance in Fiber-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. the external modulation technology, light heterodyne technology [8R.P.Braun, G.Grosskopf, D.Rohde and F.Schmidt, " Optical millimetre-wave generation and transmission experiments for mobile60GHz band communications ", Electronics Letters, 32 (7): 626-628 (1996), 9Toshiaki Kuri and Ken-ichi Kitayama, " Optical Heterodyne Detection Technique for Densely Multiplexed Millimeter-Wave-Band Radio-on-Fiber Systems, " J.Lightwave Technol.21,3167-(2003)] etc. realize.Yet, directly modulation-as be applicable to short distance, low frequency system [10Jianxin Ma, Jianjun Yu, Chongxiu Yu, Zhensheng Ji, Gee-Kung Chang, Xinzhu Sang.The influence of fiber dispersion on the code form of the optical mm-wave signal generated by single sideband intensity-modulation.Optics Communications271 (2007) 396-403], the double-side band mode of external modulation easily causes fading effect due to the dispersion of signal, single-side belt and optical carrier suppression mode easily cause that the signal time domain walks from [11Jianxin Ma, Jianjun Yu, Chongxiu Yu, Xiangiun Xin, Qi Zhang.Transmission performance of the optical mm-wave generated by double-sideband intensity-modulation.Optics Communications280 (2007) 317-326, 12Jianxin Ma, Chongxiu Yu, Zhen Zhou, Jianjun Yu.Optical mm-wave generation by using external modulator based on optical carrier suppression.Optics Communications268 (2006) 51-57].Light heterodyne technology is a kind of more effective high frequency light millimeter wave generating technique, but usually has higher phase noise; In order to reduce and to eliminate phase noise, have to introduce some complicated subsystems in the application of light heterodyne technology, as added complicated automatic frequency to control AFC subsystem [8], phase noise is eliminated circuit [9] etc. between central station and base station are than long span.
In view of the optical millimeter wave system to the device performance parameter, Fiber-optic parameter etc. require harsh, optical millimeter wave produces in experimental technique at present, mostly adopt data than the low rate situation, OOK form optical millimeter wave signal 40GHz as the carrier wave inhibition, 2.5Gbit/s[13 really yellow, Chen Lin, remaining for army building, Wen Shuanchun, adopt single phase modulator to produce millimeter wave, Chinese laser, 2008, 35 (1): 73-4], OOK optical millimeter wave signal 40GHz, 2.5Gbit/s[14 literary composition letter, Chen Lin, Pi Yazhi, remaining for army building, Wen Shuanchun, produce the full duplex fibre-optical radio communication system of optical millimeter wave based on phase-modulator, Chinese laser, 2007, 34 (7): 73-4], OOK form optical millimeter wave signal 56GHz, 2.8Gbit/s[15 open bright, the remaining foundation, Cao Zizheng, Chen Lin, produce the light carrier radio communication system of 56GHz millimeter wave based on the 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 the 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 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)], OFDM optical millimeter wave 19GHz, 4Gbit/s[18C.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 frequency doubling scheme with carder suppression, " Opt.Express16, 6056-6063 (2008)], QPSK optical millimeter wave 60GHz, 3Gbit/s[19Anthony Ng ' oma, Davide Fortusini, Devang Parekh, Weijian Yang, Michael Sauer, Seldon Benjamin, Werner Hofmann, Markus C.Amann, and Connie J.Chang-Hasnain, " Performance of a Multi-Gb/s60GHz Radio Over Fiber System Employing a Directly Modulated Optically Injection-Locked VCSEL, " J.Lightwave Technol.28, 2436-2444 (2010)], ASK optical millimeter wave 60GHz, 2Gbit/s[19].Yet China is vast in territory, populous, information communication demand rapid growth, the demand that the high bit 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, solving innovatively phase noise reduction and data is the aborning key point of optical millimeter wave than the low rate problem.
The utility model content
In the day by day urgent situation of optical millimeter wave high bit rate requirements, for the aborning phase noise reduction of optical millimeter wave and data than the low rate problem, propose a kind of high bit rate optical millimeter wave generating device, intended adopting high bit rate, optical heterodyne formula optical millimeter wave generation subsystem solution optical millimeter wave noise problem and data than the low rate problem.
Present patent application solves the technical scheme that its technical problem adopts:
The present invention proposes a kind of high bit rate optical millimeter wave generating device, intend the technical scheme adopted: the 10Gbit/s high bit rate NRZ pseudo-random pulse sequence date number of the pattern generating unit E4868 output of Agilent 43Gbit/s Error Detector 81250, remove to modulate through a 40G high-speed wideband modulator laser that the narrow linewidth Distributed Feedback Laser produces, thereby produce spectrometer AQ6319 institute scanning optical spectrum, this spectrum through coupler along separate routes, wherein a road spectrum leaches 40GHz clock multiple frequence spectrum through filter, the clock multiple frequence spectrum leached closes rood to required optical millimeter wave with another road high bit rate wide-band modulation spectrum through coupler after image intensifer.The difference of clock multiple frequence spectral centroid wavelength and high bit rate wide-band modulation spectral centroid wavelength is required millimeter wave frequency.This clock multiple frequence spectrum produces during by the single-stage Data Modulation, extremely important.Measuring instrument carries out the Measurement and analysis of various parameters.
The beneficial effect of present patent application is:
A kind of high bit rate optical millimeter wave generating device of present patent application; Because adopting same DFB LASER Light Source to produce optical millimeter wave, effectively suppressed phase noise; The DFB laser adopted has narrow linewidth, High Extinction Ratio characteristic, has effectively suppressed intensity noise; The 10Gbit/s high bit rate data that adopt Error Detector 81250 to export are removed to modulate the DFB light source by a wideband modulator and have been improved data rate.With adopt radio frequency and baseband signal respectively production method and the document [8-9] of two kinds of modulators of phase modulation and intensity compare, optical millimeter wave of the present invention produces that scheme is novel, simple possible, the high bit rate data, effectively suppresses noise.This patent method and apparatus can be used as the important references of other optical millimeter wave productions of exploratory development.For further furtheing investigate support be provided in the fields such as Microwave photonics, optical fiber communication, the access of wireless optical fiber, fiber optics.
The accompanying drawing explanation
Present patent application has proposed a kind of 40GHz, the 10Gbit/s optical millimeter wave produces new method and device, and Fig. 1 is this optical millimeter wave generating device schematic diagram; Fig. 2 is the eye pattern that the preposition amplification of high bit rate wide-band modulation spectrum records with oscilloscope DSA8300 afterwards; Fig. 3 is the light modulated spectrogram arrived in splitter (4) input port pre-test.This technical scheme can effectively suppress the aborning noise of optical millimeter wave, improve data rate.In Fig. 1, the 1st, high bit rate Error Detector 81250,2nd, 40G high-speed wideband modulator, the 3rd, narrow linewidth Distributed Feedback Laser, the 4th, splitter, the 5th, filter, the 6th, image intensifer, the 7th, high bit rate wide-band modulation spectrum, the 8th, coupler, the 9th, required optical millimeter wave, the 10th, measuring instrument.
By Fig. 2, can be obtained, signal quality is good, signal bit rate 10Gbit/s, and its extinction ratio 9.31dB, r.m.s. noise 121.47 μ W, signal to noise ratio is 31.02, r.m.s. is dithered as 1.409ps.
Embodiment
Below in conjunction with accompanying drawing, with enforcement, the present invention is further described.
Shown in Fig. 1, the 10Gbit/s high bit rate NRZ pseudo-random pulse sequence date number of the pattern generating unit E4868 output of Agilent 43Gbit/s Error Detector 81250 (1), comprise clock in data-signal extremely important, remove to modulate through a 40G high-speed wideband modulator (2) laser that narrow linewidth Distributed Feedback Laser (3) produces, thereby generation modulated spectrum, this spectrum through coupler (4) along separate routes, wherein a road spectrum leaches 40GHz clock multiple frequence spectrum through filter (5), the clock multiple frequence spectrum leached closes rood to required optical millimeter wave (9) with another road high bit rate wide-band modulation spectrum (7) through coupler (8) after image intensifer (6).The high bit rate optical millimeter wave carries out the Measurement and analysis of the various parameters of optical millimeter wave through measuring instrument (10); Measuring instrument (10) is spectrometer AQ6319, for spectrum property, detects; The line of connection spectrometer AQ6319 input port can directly be received oscilloscope DSA8300 after pulling up and remove to measure eye pattern, jittering characteristic.
The difference of clock multiple frequence spectral centroid wavelength and high bit rate wide-band modulation spectral centroid wavelength is required millimeter wave frequency.By Fig. 2 eye pattern, can be obtained, signal quality is good, signal bit rate 10Gbit/s, and its extinction ratio 9.31dB, r.m.s. noise 121.47 μ W, signal to noise ratio is 31.02, r.m.s. is dithered as 1.409ps.Fig. 3 is visible, the multiple frequence clock spectrum that high bit rate wide-band modulation spectrum is comprising the 10GHz clock, and in figure, elliptical ring has marked 40GHz clock spectrum, can the formed high bit rate optical millimeter wave of exploratory development multiple frequence clock spectrum situation.
Claims (1)
1. a high bit rate optical millimeter wave generating device, it is characterized in that: the 10Gbit/s high bit rate NRZ pseudo-random pulse sequence date number of the pattern generating unit E4868 output of Agilent 43Gbit/s Error Detector 81250 (1), remove to modulate through a 40G high-speed wideband modulator (2) laser that narrow linewidth Distributed Feedback Laser (3) produces, thereby generation modulated spectrum, this spectrum through coupler (4) along separate routes, wherein a road spectrum leaches 40GHz clock multiple frequence spectrum through filter (5), the clock multiple frequence spectrum leached closes rood to required optical millimeter wave (9) with another road high bit rate wide-band modulation spectrum (7) through coupler (8) after image intensifer (6), the difference of clock multiple frequence spectral centroid wavelength and high bit rate wide-band modulation center wavelength of light is required millimeter wave frequency, measuring instrument (10) carries out the Measurement and analysis of various parameters, measuring instrument (10) is spectrometer AQ6319, for spectrum property, detects, the line of connection spectrometer AQ6319 input port can directly be received oscilloscope DSA8300 after pulling up and remove to measure eye pattern, jittering characteristic.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103825659A (en) * | 2014-03-01 | 2014-05-28 | 聊城大学 | Method and device for generating high-speed light millimetre wave and transmitting same with long span without repeater |
| CN103905123A (en) * | 2014-03-24 | 2014-07-02 | 聊城大学 | Frequency-amplitude-adjustable long-distance local vibration source in light millimeter wave system |
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2012
- 2012-12-21 CN CN 201220752845 patent/CN203352605U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103825659A (en) * | 2014-03-01 | 2014-05-28 | 聊城大学 | Method and device for generating high-speed light millimetre wave and transmitting same with long span without repeater |
| CN103905123A (en) * | 2014-03-24 | 2014-07-02 | 聊城大学 | Frequency-amplitude-adjustable long-distance local vibration source in light millimeter wave system |
| CN103905123B (en) * | 2014-03-24 | 2017-07-18 | 聊城大学 | The adjustable remote local-oscillator source of a kind of Frequency and Amplitude in optical millimeter wave system |
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Granted publication date: 20131218 Termination date: 20161221 |
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| CF01 | Termination of patent right due to non-payment of annual fee |