基于并联MZM的载频8倍频线性调频信号光产生方法
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摘要
针对高载频、宽调谐线性调频信号产生问题,提出了一种并联MZM的载频8倍频线性调频信号光产生方法。首先利用并联MZM的边带选取特性来获取±4阶边带,然后结合外调制技术将抛物线波形加载在一个边带上,使系统产生载频8倍频的线性调频信号。最后基于Optisystem软件进行了仿真实验,产生了载频分别为40 GHz和48 GHz,带宽为16GHz的线性调频信号,实验结果验证了该方法的可行性。所提方法对可为日益高频化的军用微波系统信号源提供一种解决思路,展示了微波光子技术用于射频信号产生的巨大潜力。
To obtain linear frequency modulation(LFM) signal with high carrier frequency and large bandwidth,a photonic approach for generating LFM signal with frequency multiplication factor of 8 based on parallel MZMs is proposed.± 4 order sidebands are firstly obtained by modulating the parallel maximum-transmission Mach-Zehnder modulators(MZMs) with orthogonal radio-frequency signals,and then one sideband is selected out by optical filtering and is modulated in phase by parabolic waveforms. Thus,after frequency beating,LFM signal with octuple carrier frequency can be generated. Relative simulation experiments are conducted out by optisystem software to validate the effectiveness of the proposed method. The method we proposed can provide a solution of the signal source for military microwave systems while they become more and more high-frequency.
To obtain linear frequency modulation(LFM) signal with high carrier frequency and large bandwidth,a photonic approach for generating LFM signal with frequency multiplication factor of 8 based on parallel MZMs is proposed.± 4 order sidebands are firstly obtained by modulating the parallel maximum-transmission Mach-Zehnder modulators(MZMs) with orthogonal radio-frequency signals,and then one sideband is selected out by optical filtering and is modulated in phase by parabolic waveforms. Thus,after frequency beating,LFM signal with octuple carrier frequency can be generated. Relative simulation experiments are conducted out by optisystem software to validate the effectiveness of the proposed method. The method we proposed can provide a solution of the signal source for military microwave systems while they become more and more high-frequency.
引文
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[2]费元春,苏广川,米红,等.宽带雷达信号产生技术[M].北京:国防工业出版社,2002:1-11.FEI Yuan-chun,SU Guang-chuan,MI Hong,et al.Generation techniques for wideband radar signal[M].Beijing:National Defense Industry Press,2002:1-11.
[3]董毅.微波光子技术[J].光学与光电技术,2016,14(1):5-10.DONG Yi.Microwave photonic techniques[J].Optics and Optoelectronic Technology,2016,14(1):5-10.
[4]勾鹏琪,秦超逸,迟楠.光子辅助矢量微波/毫米波产生的关键技术研究[J].光学与光电技术,2017,15(2):46-51.GOU Peng-qi,QIN Chao-yi,CHI Nan.Research on key technology of photonic vector microwave/millimeter-wave signal generation[J].Optics and Optoelectronic Technology,2017,15(2):46-51.
[5]Jianping Yao.Microwave photonics:Arbitrary waveform generation[J].Nature Photonics,2010,4(2):79-80.
[6]Ming Li,Chao Wang,Wangzhe Li.An unbalanced temporal pulse-shaping system for chirped microwave waveform generation[J].IEEE Transactions on Microwave Theory and Techniques,2010,58(11):2968-2975.
[7]Wangzhe Li,Fanqi Kong,Jianping Yao.Arbitrary microwave waveform generation based on a tunable optoelectronic oscillator[J].Journal of Lightwave Technology,2013,31(23):3780-3786.
[8]Chao Wang,Jianping Yao.Photonic generation of chirped microwave pulses using superimposed chirped fiber bragg grating[J].IEEE Photonics Technology Letters,2008,20(11):882-884.
[9]Chao Wang,Jianping Yao.Chirped microwave pulse generation based on optical spectral shaping and wavelength to time mapping using a sagnac loop mirror incorporating a chirped fiber bragg grating[J].Journal of Lightwave Technology,2009,27(16):3336-3341.
[10]Chao Wang,Jianping Yao.Large time bandwidth product microwave arbitrary waveform generation using a spatially discrete chirped fiber bragg grating[J].Journal of Lightwave Technology,2010,28(11):1652-1660.
[11]Jiejun Zhang,Olympio Lucchini Coutinho.Photonic generation of a linearly chirped microwave waveform with long temporal duration using a dispersive loop[C].Microwave Symposium(IMS),IEEE MTT-S International,2015.
[12]Jiejun Zhang,OlympioLucchini Coutinho.A photonic approach to linearly chirped microwave waveform generation with an extended temporal duration[J].IEEE Transactions on Microwave Theory and Techniques,2016,64(06):1947-1953.
[13]Xiong Luo,Lan Yu,Daoming Zhang,et al.A novel approach for generation of tunable linearly chirped microwave waveform with large time-bandwidth product[C].15th international conference on optical communication and networks,2016.