Cascaded fiber Sagnac loop-based microwave photonic multiband bandpass filter with a selectable passband frequency  

作　　者：顾军 王飞 路侑锡 彭蒙蒙 史伦 李昌熹 

机构地区：[1]School of Science, Chongqing University of Technology, Chongqing 400054, China [2]School of Electrical and Electronic Engineering, Chongqing University of Technology, Chongqing 400054, China [3]School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea

出　　处：《Chinese Optics Letters》2017年第11期19-23,共5页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.61575034,11474233,and 61302026);the Key Project of the Natural Science Foundation Project of Chongqing(No.cstc2013jj B40002);the Commission of Education of Chongqing City of China(No.KJ1400942);the Chongqing Research Program of Basic Research and Frontier technology(No.cstc2015jcyj A40035);the Chongqing University of Technology Graduate Innovation Fund(No.YCX2016235)

摘　　要：A passband frequency-electable microwave photonic multiband bandpass filter based on a cascaded fiber Sagnac loop is presented and experimentally demonstrated.A broadband light is sliced by the cascaded fiber Sagnac loop,which serves as a spectrum slicer.After broadband light passes through the spectrum slicer,the sliced broadband light will have the varied periodical spectral characteristics that will cause a transmitted spectral distribution with uniform or multiple periods,then will be modulated by an optical phase modulator and delayed by a dispersive medium.Therefore,a frequency-band-selectable microwave photonic multiband bandpass filter with a suppressed baseband is achieved that can be switched between the single-passband,dual-passband,and triple-passband state.The presented filter exhibits a maximal out-of-band rejection ratio of about 30 d B.A passband frequency-electable microwave photonic multiband bandpass filter based on a cascaded fiber Sagnac loop is presented and experimentally demonstrated.A broadband light is sliced by the cascaded fiber Sagnac loop,which serves as a spectrum slicer.After broadband light passes through the spectrum slicer,the sliced broadband light will have the varied periodical spectral characteristics that will cause a transmitted spectral distribution with uniform or multiple periods,then will be modulated by an optical phase modulator and delayed by a dispersive medium.Therefore,a frequency-band-selectable microwave photonic multiband bandpass filter with a suppressed baseband is achieved that can be switched between the single-passband,dual-passband,and triple-passband state.The presented filter exhibits a maximal out-of-band rejection ratio of about 30 d B.

关 键 词：photonic microwave cascaded MODULATOR broadband REJECTION switched triple modulated PERIODICAL 

分 类 号：TN713[电子电信—电路与系统]