Bandwidth-reconfigurable single-passband microwave photonic filter based on stimulated Brillouin scattering

作     者：GONG Jing-wen LI Xiao-jun TAN Qing-gui LIANG Dong JIANG Wei 龚静文;李小军;谭庆贵;梁栋;蒋炜

作者机构：China Academy of Space Technology (Xi'an) 

出 版 物：《Optoelectronics Letters》 (光电子快报（英文版）)

年 卷 期：2019年第15卷第1期

页      面：11-15页

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 080902[工学-电路与系统] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：supported by the National Advanced Research Foundation of China(No.614241105010717) 

主　　题：microwave filter scattering 

摘      要：A bandwidth-reconfigurable filter is necessary to meet the need of growing communication capacity and signal coverage frequency range. The stimulated Brillouin scattering(SBS) gain spectrum as a filter passband is used to extract desired microwave signals. Due to the fact that the passband is formed by mapping the Brillouin gain spectrum, bandwidth reconfigurability can be implemented by changing Brillouin gain linewidth. In this paper, a scheme using a 5-lines optical comb acting as a Brillouin pump is experimentally demonstrated. The spectrum of the 5-lines optical comb is extended by a binary phase shift keying(BPSK) pulse modulated signal. Experiments have shown that the 3-dB and 20-dB bandwidths of the filter are 196 MHz and 257 MHz, respectively, and its 20-dB shape factor is 1.31. The passband ripple is ～3.5 dBm with stop-band rejection of 20 dBm under 15 dBm optical pump power.