基于双平行马赫曾德尔调制器和受激布里渊散射效应的十倍频毫米波信号生成
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摘要
提出了一种基于双平行马赫-曾德尔调制器(DPMZM)和受激布里渊散射(SBS)效应的10倍频mm波信号生成方案,具有覆盖频段高和频谱纯度高等优点。在本文方案中,低频率的射频(RF)信号通过DPMZM对激光器发出的光波进行调制,调节直流偏置电压,使DPMZM的主调制器和两个子调制器均工作在最小传输点(MITP),抑制光载波和偶数边带,进一步调节两个子调制器的调制深度和移相器的相移,抑制一阶和七阶边带,留下三阶和五阶边带,然后利用SBS效应进行布里渊边带滤波滤除三阶边带,仅保留五阶边带,再经光电探测器(PD)拍频即可获得10倍频mm波信号。通过仿真实验,以10GHz的RF信号为驱动信号,得到了100GHz的mm波信号,验证了方案的可行性。
A scheme based on dual-parallel Mach-Zehnder modulator(DPMZM)and stimulated Brillouin scattering(SBS)effect is proposed to generate millimeter wave signals with a frequency 10 times of the radio frequency(RF)signal,which possesses the advantages of wide frequency and high spectral purity.In this scheme,a low frequency RF signal modulates the lightwave by a dual-parallel Mach-Zehnder modulator in which the main modulator and two sub modulators are all biased at the minimum transmission point via adjusting the dc bias to suppress the even-order sidebands.Then the first-order and seventh-order sidebands at the output of dual-parallel Mach-Zehnder modulator can be suppressed by properly adjusting modulation indices of the sub modulators and phase shift of the phase shifter,so that the third-order and fifth-order sidebands can be retained.The third-order sidebands can be filtered out by SBS-assisted filter of stimulated Brillouin scattering effect,with fifth-order sidebands retained only.And then through beat frequency of the photoelectric detector(PD),millimeter wave signals with a frequency10 times of RF signal can be obtained.Finally,simulation is performed to verify the feasibility of the scheme.When the frequency of the RF driving signal is 10 GHz,the millimeter wave signal with frequency of 100 GHz is achieved.
A scheme based on dual-parallel Mach-Zehnder modulator(DPMZM)and stimulated Brillouin scattering(SBS)effect is proposed to generate millimeter wave signals with a frequency 10 times of the radio frequency(RF)signal,which possesses the advantages of wide frequency and high spectral purity.In this scheme,a low frequency RF signal modulates the lightwave by a dual-parallel Mach-Zehnder modulator in which the main modulator and two sub modulators are all biased at the minimum transmission point via adjusting the dc bias to suppress the even-order sidebands.Then the first-order and seventh-order sidebands at the output of dual-parallel Mach-Zehnder modulator can be suppressed by properly adjusting modulation indices of the sub modulators and phase shift of the phase shifter,so that the third-order and fifth-order sidebands can be retained.The third-order sidebands can be filtered out by SBS-assisted filter of stimulated Brillouin scattering effect,with fifth-order sidebands retained only.And then through beat frequency of the photoelectric detector(PD),millimeter wave signals with a frequency10 times of RF signal can be obtained.Finally,simulation is performed to verify the feasibility of the scheme.When the frequency of the RF driving signal is 10 GHz,the millimeter wave signal with frequency of 100 GHz is achieved.
引文
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[2]Seeds A J,Williams K J.Microwave photonics[J].J.Lightw.Technol.,2006,24(12):4628-4641.
[3]Biagio Masella,ZHANG Xiu-pu.Linearized optical singlesideband Mach-Zehnder modulator for radio-over-fiber systems[J].IEEE Photonics Technology Letters,2007,19(24):2024-2026.
[4]XU Zuo-wei,FU Hong-yan,CAI Zhi-ping.Microwave frequency multiplication based on cascaded fiber ring microwave photonic filters[J].Journal of Optoelectronics·Laser,2014,25(1):65-69.徐作为,付宏燕,蔡志平.基于级联光纤环微波光子滤波器的微波倍频技术研究[J].光电子·激光,2014,25(1):65-69.
[5]Lin C T,Shih P T,Xue W Q,et al.Optical millimeterwave signal generation using frequency quadrupling technique and no optical filtering[J].Photonics Technology Letters,IEEE,2008,20(12):1027-1029.
[6]WEI Zhi-hu,WANG Rong,FANG Tao,et al.Sextupling tunable mm-wave signal generation based on intensity modulation and Brillouin effect[J].Journal of Optoelectronics·Laser,2012,23(10):1890-1894.魏志虎,王荣,方涛,等.基于强度调制和布里渊效应的六倍频可调毫米波信号产生[J].光电子·激光,2012,23(10):1890-1894.
[7]SHI Pei-ming,YU Song,LI Ze-kun,et al.A novel frequency sextupling scheme for optical mm-wave generation utilizing an integrated dual-parallel Mach-Zehnder modulator[J].Opt.Commun.,2010,283(19):3667-3672.
[8]GAO Yong-sheng,WEN Ai-jun,YU Qing-wei,et al.Microwave generation with photonic frequency sextupling based on cascaded modulators[J].IEEE Photonics Technology Letters,2014,26(12):1199-1202.
[9]SHANG Jian-ming,WANG Dao-bin,LIU Yan-jun,et al.Research on the controllable frequency octupling technology for generating optical millimeter-wave by external modulator[J].Acta Optica Sinica,2014,34(5):0506003.商建明,王道斌,刘延君,等.基于外调制器的可控八倍频光载毫米波生成技术研究[J].光学学报,2014,34(5):0506003.
[10]ZHANG Ya-mei,PAN Shi-long.Experimental demonstration of frequency-octupled millimeter-wave signal generation based on a dual-parallel Mach-Zehnder modulator[A].Proc.of Microwave Workshop Series on Millimeter Wave Wireless Technology and Applications(IMWS),2012IEEE MTT-S International[C].2012,1-4.
[11]LI Wang-zhe,YAO Jian-ping.Microwave generation based on optical domain microwave frequency octupling[J].IEEE Photon Technol Lett,2010,22(1):24-26.
[12]MA Jian-xin,XIN Xiang-jun,XU Jun,et al.Optical millimeter wave generated by octupling the frequency of the local oscillator[J].J.Opt.Netw.,2008,7(10):837-845.
[13]SHANG Lei,WEN Ai-jun,LI Bo,et al.A filerless optical millimeter-wave generation based on frequency octupling[J].Optik,2012,123(13):1183-1186.
[14]Kawanishi T,Sakamoto T,Tsuchiya M,et al.70dB extinction-ratio LiNbO3optical intensity modulator for two-tone lightwave generation[A].Proc.of Optical Fiber Communication Conference.Optical Society of America[C].2006,OWC4.
[15]ZHOU Wei,ZOU Xi-hua,PAN Wei,et al.Photonic generation of microwave signals with a 24 multiplied frequency using cascaded Mach-Zehnder modulators and four-wave mixing[J].Journal of Optoelectronics·Laser,2013,24(12):2332-2337.周威,邹喜华,潘炜,等.基于级联调制器和四波混频效应的24倍频微波信号的光学生成[J].光电子·激光,2013,24(12):2332-2337.