余弦型Y分支结构参数的性能分析

Analysis of the Cosine Style of Y-branch Parameters Characteristic

针对低损耗余弦型Y分支光波导的分析与设计,首先对其弯曲损耗进行理论推导,其次对光传播损耗特性起主要影响作用的三个结构参数(波导宽度、过渡区长度、分支高度),利用有限差分光束传播法(FD-BPM)进行了逐个性能优化分析。结果表明:传输损耗随波导宽度的增加而减小,随过渡区长度的增长而减小,随分支高度的增加而增大,此结果可为各种Y分支的选取提供参考。

Aimed at theY-branch optical waveguide of low loss cosine style, the bending loss theory was calculated by the finite difference beam propagation method, systematic simulate the optical transmit situation of Y-branch structure and the three important structure parameters had carried on optimization analysis. The results show that the transmit loss decrease with the waveguide width increasing, and transition length decrease with the branch height increasing. The results provide a useful reference for selecting the Y-branch.