基于级联外调制器的六倍频微波信号的光学生成技术研究
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摘要
提出并实验验证了一种基于级联偏振调制器(PolM)和双平行马赫-曾德尔调制器(DPMZM)的六倍频微波信号的光学生成方法。PolM在射频(RF)信号调制下,会产生多个光边带,通过调节偏振控制器(PC)和检偏器仅获得奇数阶边带,然后通过DPMZM,其中一子MZM调制RF信号,工作在最大传输点(MATP),另一子MZM不调制RF信号,从而抑制掉一阶边带,保留三阶边带,经光电探测器(PD)拍频获得六倍频微波信号。仿真结果表明,在不利用任何光、电滤波器的情况下,调制器消光比为理想状态(100dB)时,RF杂散抑制比(RFSSR)为34dB。即使消光比为非理想状态(30dB)时,生成微波信号的RFSSR仍可以达到21dB。理论分析和实验结果均验证了方案的可行性。
A photonic approach of frequency-sextupling microwave signal generation by cascading apolarization modulation(PolM)and a dual-parallel Mach-Zehnder modulator(DPMZM)is theoretically proposed and experimentally verified.Optical sidebands are generated under the condition of radio frequency(RF)signal modulation.By adjusting the polarization controller(PC)before the polarizer and analyzer,only odd-order sidebands are kept.Then going through the DPMZM,one of the sub MZMs is modulated by RF signal,in the maximum transfer point(MATP).The other sub MZM is not modulated.The first order sidebands are suppressed,so that the third order sidebands are preserved.A frequency sextupling microwave signal can be obtained by beating the two third order siandbands at the photodetector(PD).The simulation results show that the radio frequency spurious suppression ratio(RFSSR)is as high as34 dB under the condition of ideal extinction ratio(100dB)without any optical or electrical filter.Even if the extinction ratio is 30 dB,the RFSSRcan still reach 21 dB.Both theoretical analysis and experimental results verify the feasibility of the proposed scheme.
A photonic approach of frequency-sextupling microwave signal generation by cascading apolarization modulation(PolM)and a dual-parallel Mach-Zehnder modulator(DPMZM)is theoretically proposed and experimentally verified.Optical sidebands are generated under the condition of radio frequency(RF)signal modulation.By adjusting the polarization controller(PC)before the polarizer and analyzer,only odd-order sidebands are kept.Then going through the DPMZM,one of the sub MZMs is modulated by RF signal,in the maximum transfer point(MATP).The other sub MZM is not modulated.The first order sidebands are suppressed,so that the third order sidebands are preserved.A frequency sextupling microwave signal can be obtained by beating the two third order siandbands at the photodetector(PD).The simulation results show that the radio frequency spurious suppression ratio(RFSSR)is as high as34 dB under the condition of ideal extinction ratio(100dB)without any optical or electrical filter.Even if the extinction ratio is 30 dB,the RFSSRcan still reach 21 dB.Both theoretical analysis and experimental results verify the feasibility of the proposed scheme.
引文
[1]YAO Jian-ping.Microwave photonics[J].J.Lightw.Technol.,2009,27(13):314-335.
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[9]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.
[10]YING Xiang-yue,XU Tie-feng,LIU Tai-jun.Influence of finite extinction ratio of MZM on optically generated millimeter-wave[J].Opto-Electronic Engineering,2012,39(2):26-30.应祥岳,徐铁峰,刘太君.马赫曾德尔调制器有限消光比对光生毫米波的影响[J].光电工程,2012,39(2):26-30.
[11]ZHOU Wei,ZOU Xi-hua,PAN Wei,et al.Frequency-octupling microwave signal generation based on a single polarization modulator and an optical interleaver[J].Journal of Optoelectronics·Laser,2014,25(2):276-281.周威,邹喜华,潘炜,等.基于单个偏振调制器和光交错滤波器的八倍频微波信号产生研究[J].光电子·激光,2014,25(2):276-281.
[12]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.
[13]MA Jian-xin,XIN Xiang-jun,XU Jun,et al.Optical millimeter wave generated by octupling the frequency of the local oscillator[J].JOpt Netw,2008,7(10):837-845.
[14]Lin C T,Shih P T,Jiang Jr W,et al.A continuously tunable and filterless optical millimeter-wave generation via frequency octupling[J].Optics Express,2009,17(22):19749-19756.
[15]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.
[2]Seeds A J,Williams K J.Microwave photonics[J].J.Lightw.Technol.,2006,24(12):4628-4641.
[3]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.
[4]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.
[5]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.
[6]XU Li-li,NING Ti-gang,LI Jing,et al.Improved 60 GHz millimeter-wave generator based on feed-forward modulation modulation[J].Acta Optica Sinica,2013,33(2):0206002.许丽丽,宁提纲,李晶,等.一种改进的基于前向调制技术生成60 GHz毫米波方案[J].光学学报,2013,33(2):0206002.
[7]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.
[8]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.
[9]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.
[10]YING Xiang-yue,XU Tie-feng,LIU Tai-jun.Influence of finite extinction ratio of MZM on optically generated millimeter-wave[J].Opto-Electronic Engineering,2012,39(2):26-30.应祥岳,徐铁峰,刘太君.马赫曾德尔调制器有限消光比对光生毫米波的影响[J].光电工程,2012,39(2):26-30.
[11]ZHOU Wei,ZOU Xi-hua,PAN Wei,et al.Frequency-octupling microwave signal generation based on a single polarization modulator and an optical interleaver[J].Journal of Optoelectronics·Laser,2014,25(2):276-281.周威,邹喜华,潘炜,等.基于单个偏振调制器和光交错滤波器的八倍频微波信号产生研究[J].光电子·激光,2014,25(2):276-281.
[12]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.
[13]MA Jian-xin,XIN Xiang-jun,XU Jun,et al.Optical millimeter wave generated by octupling the frequency of the local oscillator[J].JOpt Netw,2008,7(10):837-845.
[14]Lin C T,Shih P T,Jiang Jr W,et al.A continuously tunable and filterless optical millimeter-wave generation via frequency octupling[J].Optics Express,2009,17(22):19749-19756.
[15]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.