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 lossat only 0.6 dB.Most optical field of the composite waveguide transmits through the As2 S8film,which greatly benefits the optical stopping effect.%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0.6 dB.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.
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