多模干涉型B270-As_2S_8复合光波导的优化设计

The optimized design of MMI B270-As_2S_8 composite waveguide

为了更加完整有效地研究As2S8薄膜波导的饱和光阻断和非饱和光阻断效应及其应用,提出并设计出了一种新型的、可有效实现光阻断效应的多模干涉型B270-As2S8复合光波导结构,该复合波导的输入端和输出端与单模条波导同基集成。利用3维光束传播方法(BPM)进行仿真运行,结果显示,该复合波导的端接耦合效率可以达到94.53%,插入损耗仅为0.6dB。复合波导中的光场大部集中在As2S8薄膜中传输,并且具备了良好的导波传输特性,十分有利于光阻断效应的有效实施。

In order to completely and effectively study saturated and unsaturated optical stopping effect and application, a new B270-As2 S8 composite waveguide effectively used in optical stopping is designed. The input and output of the composite waveguide single-mode strip waveguide are integrated at the same base. 3-D beam propagation method （BPM） simulation shows that the transverse coupling efficiency can reach 94. 53%, with insertion loss at only 0. 6 dB. Most optical field of the composite waveguide transmits through the As2 S8 film, which greatly benefits the optical stopping effect.