A widely tunable microwave photonic notch filter with adjustable bandwidth based on multi-wavelength fiber laser  

作　　者：LI Xin-yang CAO Ye XU Dong TONG Zheng-rong YANG Jing-peng 李鑫阳;曹晔;许东;童峥嵘;杨菁芃(School of Electronic Information, Qingdao University;Communication Devices and Technology Engineering Research Center, School of Computer and Communication Engineering, Tianjin University of Technology)

机构地区：[1]School of Electronic Information, Qingdao University, Qingdao 266071, China [2]Communication Devices and Technology Engineering Research Center, School of Computer and Communication Engineering, Tianjin University of Technology, Tianjin 300384, China

出　　处：《Optoelectronics Letters》2017年第4期259-262,共4页光电子快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.11444001);the Municipal Natural Science Foundation of Tianjin in China(No.14JCYBJC16500)

摘　　要：A widely tunable microwave photonic notch filter with adjustable bandwidth based on multi-wavelength fiber laser is proposed and demonstrated. The multi-wavelength fiber laser generates the multi-taps of the microwave photonic filter （MPF）. In order to obtain notch frequency response, a Fourier-domain optical processor （FD-OP） is introduced to con- trol the amplitude and phase of the optical carrier and phase modulation sidebands. By adjusting the polarization con- troller （PC）, different numbers of taps are got, such as 6, 8, 10 and 121 And the wavelength-spacing of the multi-wavelength laser is 0.4 nm. The bandwidth of the notch filter is changed by adjusting the number of taps and the corresponding bandwidths are 4.41 GHz, 3.30 GHz, 2.64 GHz and 2.19 GHz, respectively. With the additional phase shift introduced by FD-OP, the notch position is continuously ttmed in the whole free spectral range （FSR） of 27.94 GHz. The center frequency of the notch filter can be continuously tuned from 13.97 GHz to 41.91 GHz.

关 键 词：Bandpass filters BANDWIDTH Fiber lasers Finite difference method Frequency response Microwave filters 

分 类 号：TN713[电子电信—电路与系统]