光格型FIR奇偶交错滤波器设计

Design of optical lattice FIR interleaver

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恪型阵列具体参数(单位时延△τ和耦合角θk)的算法编写了相应的计算程序,讨沦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。在此基础上没计了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0dB,隔离度可以达到50dB。

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.