一种改进的有限差分光束传输法

A New Kind of Advanced FD-BPM

改进了传统的有限差分光束传播法(FD BPM),实现了一种新的基于近似传播常数的FD BPM。该算法与传统方法相比,无论是在计算精度、收敛速度,还是在计算稳定性方面都得到了有效的提高;在传统解析求解方法失效的情况下,该方法在求解复杂折射率分布光波导的传播常数也具有较高的理论参考价值。

Compared with traditional FDBPM,a new kind of advanced FDBPM which was based on the approximate value of prapagation constant can archieve a better result of a prapagation field.such a method is of many advantages such as high precision of output field,high rate of stypsis,and stability for computation.Since obtaining pefect resolution fail,the new kind of method is of high value to calculate the almost prapagation constant with very complicated refractive index distribution.