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对于芯区为非线性介质、覆盖层和衬底为线性介质的平板波导，以克尔型薄膜为例，用有 限差分法导出了非线性波导的场分布和功率的数学表达式，并给出了典型实例的计算数据和 曲线。这种方法编程十分简单，有普适性，可精确求得非线性薄膜波导中场强与功率的分布。
In the case of the Kernal film, the field distribution and the power of the nonlinear waveguide are derived by the finite difference method for the plate waveguide with a nonlinear medium in the core region, a covering layer and a substrate as a linear medium. A typical example of the calculated data and curves. This method is very simple programming, universal, can accurately obtain the nonlinear film waveguide field strength and power distribution.