量子电子学报, 2005, 22 (5): 799, 网络出版: 2006-05-15
光格型FIR奇偶交错滤波器设计
Design of optical lattice FIR interleaver
光通信 奇偶交错滤波器 光格型FIR滤波器 矩形度 平顶频响 optical communication Interleaver optical lattice FIR filter rectangle degree flat top frequency response
摘要
用光格型有限冲激响应(FIR)滤波器模型在z变换域对耦合器级联形式的奇偶交错滤波器进行了理论分析,根据由目标滤波函数求解光格型阵列具体参数(单位时延△τ和耦合角θk)的算法编写了相应的计算程序,讨论了通带和阻带边界归一化频率位于0.5附近的z域低通滤波器和光域奇偶交错滤波器的对应关系.在此基础上设计了a~e五种滤波器,其幅频响应特性曲线类似矩形,通带顶部平坦、纹波接近于0 dB,隔离度可以达到50 dB.
Abstract
Cascaded coupler interleaver using optical lattice FIR filter model in z-transform is theoretically analyzed. Programming based on the algorithm to resolve optical lattice array concrete parameter (unit time delay △T and coupler angle θk) for objective function, corresponding relationship between z domain low-pass filter with about 0.5 boundary normalized frequency for pass band and optical domain interleaver are discussed. Five kinds of filters (from a to e) are designed, with rectangle-like amplitude frequency response characteristic curve, fiat top pass band, nearly 0 dB ripples, and isolation up to 50 dB.
张瑞峰, 胡智勇, 葛春风, 王书慧, 李世忱. 光格型FIR奇偶交错滤波器设计[J]. 量子电子学报, 2005, 22(5): 799. 张瑞峰, 胡智勇, 葛春风, 王书慧, 李世忱. Design of optical lattice FIR interleaver[J]. Chinese Journal of Quantum Electronics, 2005, 22(5): 799.