把数值传递函数方法应用于对平面光波导的分析。本方法从光波导的标量变分关系出发 ,通过状态方程对问题求解计算。文中引入了传递函数无穷单元的概念 ,使得本方法在处理近截止区域的问题时更加合理 ,计算量更小。文后给出了本文方法的应用和算例 ,与多种方法进行了比较 ,表明本文方法在处理折射率均匀分布和渐变分布波导时都有着特有的优势。 The numerical transfer function method is applied to the analysis of planar optical waveguides. This method is based on the scalar variational relationship of optical waveguides and the state equations are used to solve the problem. In this paper, the concept of infinite element of transfer function is introduced, which makes the method more reasonable and less computationally costly when dealing with the problem of near-deadband. The application and examples of this method are given and compared with other methods. The results show that this method has unique advantages when dealing with uniform distribution of refractive index and waveguide with gradual distribution.