Switchable down-,up-and dual-chirped microwave waveform generation with improved time–bandwidth product based on polarization modulation and phase encoding  

作　　者：Yuxiao Guo Muguang Wang Hongqian Mu Guofang Fan 郭玉箫;王目光;牟宏谦;范国芳(Institute of Lightwave Technology,Key Laboratory of All Optical Network and Advanced Telecommunication Network,Ministry of Education,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]Institute of Lightwave Technology,Key Laboratory of All Optical Network and Advanced Telecommunication Network,Ministry of Education,Beijing Jiaotong University,Beijing 100044,China

出　　处：《Chinese Physics B》2022年第7期620-628,共9页中国物理B（英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.U2006217,61775015,and 62101027);the Fundamental Research Funds for the Central Universities(Grant Nos.2021JBZ103 and 2021YJS002)。

摘　　要：A switchable down-,up-and dual-chirped microwave waveform generation technique with improved time–bandwidth product(TBWP)is proposed and demonstrated based on a dual-polarization dual-parallel Mach–Zehnder modulator(DPDPMZM)cascaded with a polarization modulator(Pol M).By properly controlling the phase shifts of the radio frequency signals applied to the DP-DPMZM,switchable down-,up-and dual-chirped waveforms with simultaneous frequency and bandwidth doubling can be generated.To enlarge the TBWP further,splitting parabolic signal and phase-encoding splitting parabolic signal are used to drive the Pol M for the enhancement of bandwidth and time duration.Numerical results demonstrate the generation of down-,up-and dual-chirped microwave waveform with TBWP of 8,160 and 10240.The proposed method may find applications in future multifunction radar systems due to the high performance and flexibility.

关 键 词：microwave photonics linearly chirped waveform generation time–bandwidth product 

分 类 号：TN761[电子电信—电路与系统]