指向耦合器型TE/TM模分离器结构参数优化设计

Optimum Design of TE/TM Mode Splitter of Directional-coupled Structure

采用简单的理论模型 ,对折射率呈渐变分布的钛扩散LiNbO3 波导进行结构优化 ,得到模式分离的最佳结构参数 ,用光束传播方法 (BPM法 )设计了有金属覆盖层的指向耦合器型TE/TM模分离器 ,偏振串音分别达到 -2 0 8dB(TE模 )和 - 2 1 3dB(TM模 )。

Based on a simple theoretical model for Ti in diffused LiNbO3 optical waveguide with graded-index distribution, the optimal configuration parameters for TE/TM mode splitter of directional-coupled structure with metal clad have been obtained by using the beam propagation method. The theoretical crosstalk is less than -20.8 dB (TE mode) and -21.3 dB (TM mode) for λ=1.523 μm.