扩散沟道光波导的条形传递函数解

STRIP DISTRIBUTED TRANSFER FUNCTION ANALYSIS OF DIFFUSED CHANNEL WAVEGUIDES

利用条形传递函数方法分析了二维扩散沟道光波导的传播特性，对两种典型折射率分布计算的数值结果与精确解及其它方法的结果进行了比较。

A novel technique has been developed to treat the problem of wave propagation along diffused channel waveguides.This technique is based on a Strip Distributed Transfer Function Method (SDTFM) which has originally been applied to static and dynamic problems of two dimensional elastic bodies in recently years.In the analysis,a region over the cross section of waveguide is first divided into a number of subregions;each subregion is then divided into finite strips.Through introduction of strip distributed transfer functions,the field of every subregion is presented in a semi exact and closed form;the whole region is systematically assemblied from the subregions leading to a set of linear algebraic eigenvalue equations.Solution of those equations yields the propagation constant.Calculated results for graded index channel waveguides have been given and compared with exacted numerical value and other methods,which reveal that the method has a precision excellenter than other numerical methods.