Mach-Zehnder结构波导调制器的模拟分析

 将三维级数展开法与光束传播法相结合，把标量光束传播法方程转化为一阶常微分方程组;在模拟中引入正切函数变换将无限平面映射为有限平面，避免了边界截断问题,与传统的BPM法相比，该方法具有计算方法简单和计算效率高的优点。运用该法分析了Mach-Zehnder结构的铌酸锂电光波导调制器，模拟了光场在器件中的分布情况，获得了这种调制器模场损耗曲线和最佳结构参数。

Simulation analysis for Mach-Zehnder waveguide modulators

Combined with series expansion method (SEM), three-dimensional scalar beam propagation method (BPM) was transformed into a first-order normal differential equations. And the function of tangent was applied to map the infinite space into a finite space to avoid boundary truncation. Compared with the traditional BPM, this method has the advantages of simple calculation, high calculation efficiency and small deduced matrix. The lithium niobate electro-optic waveguide modulator with Mach-Zehnder structure was simulated by this method. The authors get its optical field distribution and acquire its optimal structure and its power loss curve.