A cascaded microwave photonic filter based on a low- coherence infinite-impulse-response filter  

作　　者：XU En-ming WANG Fei LI Pei-li 

机构地区：[1]School of Optoelectronic Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210046,China [2]School of Optoelectronic Information, Chongqing University of Technology, Chongqing 400054, China

出　　处：《Optoelectronics Letters》2013年第3期165-168,共4页光电子快报（英文版）

基　　金：This work has been supported by the National Natural Science Foundation of China （No.61007064）, the Jiangsu Natural Science Foundation （No.BK2012432）, the Ph.D. Programs Foundation of the Ministry of Education of China （No.B J212016）, and the Scientific Research Foundation of Nanjing University of Posts and Telecommunications （No.NY211017）.

摘　　要：A cascaded filter combining active and passive filters is proposed. The active filter acts as a low-coherence infinite-impulse-response (IIR) filter and achieves a sharp frequency response. The low-coherence IIR filter is realized by employing the cross-gain modulation (XGM) of the amplified spontaneous emission (ASE) spectrum of the semiconductor optical amplifier (SOA). The passive filter is an n-section unbalance Mach-Zehnder (UMZ) structure, which is used to increase free spectral range (FSR) and Q factor further. The low-coherence IIR filter cascaded with one section of UMZ passive filter is experimentally demonstrated, and a Q factor of 1268 is obtained.A cascaded filter combining active and passive filters is proposed. The active filter acts as a low-coherence infi- nite-impulse-response （IIR） filter and achieves a sharp frequency response. The low-coherence IIR filter is realized by employing the cross-gain modulation （XGM） of the amplified spontaneous emission （ASE） spectrum of the semicon- ductor optical amplifier （SOA）. The passive filter is an n-section unbalance Mach-Zehnder （UMZ） structure, which is used to increase free spectral range （FSR） and Q factor further. The low-coherence IIR filter cascaded with one section of UMZ passive filter is experimentally demonstrated, and a Q factor of 1268 is obtained.

关 键 词：无限脉冲响应滤波器 低相干 微波光子 级联 IIR滤波器 无源滤波器 半导体光放大器 放大的自发辐射 

分 类 号：TN253[电子电信—物理电子学] TB535