用迭代Chebyshev方法设计密集型波分复用窄带滤光片

提出了一种简单而有效的设计方法，即迭代Chebyshev方法．通过对Chebyshev带通滤光片设计过程的研究，指出由于多层λ0／4反射堆与原型滤光片的相位特性差异，造成最终带宽显著变窄．从某个给定的比较大带宽初值出发，经过一系列简单的迭代过程，即可得到满足要求的最终结构，从而避免对反射膜堆相位特性的计算．同时，文中还讨论了在优化过程中加入对干涉级次即间隔层厚度和波纹因子进行迭代的结果，最后给出了用迭代Chebyshev方法设计波分复用窄带滤光片的过程、框图及实际设计结果，并指出通过不同的迭代过程实现方向受控的优化过程，是该种设计方法的基本原理．

DESIGN OF DWDM NARROW BAND FILTERS WITH ITERATIVE CHEBYSHEV METHOD

A simple but valuable iterative Chebyshev design method was presented. By studying the design procedure of Chebyshev band pass filters, we pointed out that it is the phase variation that results in the remarkable narrowing in the final pass band. Beginning with some larger initial values, one can arrive at satisfactory results after several simple iterations without calculating the phase property of reflective stacks. The results of adding interference orders and ripples to the iteration procedures was discussed. The design block diagrams and some actual design results were given. The basic principle of this method is to realize a direction-controlled optimization through different iterative procedures.