全光纤奇偶交错空分滤波器的优化设计

Optimized Design of All Fiber Interleaver

从准傅里叶变换的方法出发,分析了多级光纤马赫 曾德(M Z)干涉仪的频域传输特性,得到了隔离度和通带宽度与各个耦合器的分光比和各级干涉臂长差的关系,进而提出了高隔离度平顶通带频响全光纤奇偶交错滤波器的制作方案。隔离度高达45dB以上,而且通带平坦,满足目前密集波分复用(DWDM)系统的要求。

Based on the quasiFourier transform method,the transmission characteristics of cascaded MZ interferometer was analyzed in frequency domain,and the relationship between isolation,passband width and coupling ratio,arm length difference was investigated.At last a solution of high isolation and flattop passband frequency response was introduced,according to all fiber interleaver scheme.With a high isolation more than 45 dB and flattop passband,the interleaver can meet the demand of current DWDM systems.