介绍了在用两步离子交换方法制作光功分器中 ,在高斯分布为初始条件下采用平均法求出非线性两步离子扩散方程的折射率分布 ,与实验测出的折射率分布符合得很好。该法尤其对单模光功分器求其折射率更为简单和实用。 Introduced in the two-step ion exchange method of optical power splitter, the Gaussian distribution as an initial condition using the average method to obtain the nonlinear two-step ion diffusion equation refractive index distribution consistent with the experimentally measured refractive index distribution well. This method is especially simple and practical for obtaining the refractive index of a single-mode optical power splitter.