锥形多模干涉耦合器一般成像特性分析  

General Self-Imaging Properties for Line-Tapered Multimode Interference Couplers

作　　者：乐孜纯[1] 黄孙港[1] 胡劲华[1] 付明磊[1] 张明[1] 

机构地区：[1]浙江工业大学理学院,浙江杭州310023

出　　处：《光学学报》2011年第6期67-73,共7页Acta Optica Sinica

基　　金：浙江省自然科学基金(Y1080172);浙江省重大科技计划项目(2009C11051)资助课题

摘　　要：锥形多模干涉耦合器克服了传统多模干涉(MMI)耦合器结构尺寸大的缺点,满足当前集成光器件高集成度的要求,其成像特性对设计基于它的集成光器件至关重要。根据多模干涉耦合器的自映像原理,对锥形多模干涉耦合器成像特性进行分析,发现成像特性与输入场位置、位置数、多模波导初始宽度及渐变率等参量密切相关,得到成像位置的解析表达式并总结出规律。最后采用导模传输分析法进行数值模拟和有限差分束传输法(FDBPM)进行仿真,验证了理论分析的正确性。根据成像位置表达式和规律,得到锥形多模干涉耦合器的一般成像特性,为用锥形多模干涉耦合器设计集成光器件的研究提供了理论依据和设计参考。The line-tapered multimode interference couplers which are more compact than traditional multimode interference couplers had been widely used in integrated optical components. The self-imaging properties are the most important characteristics for their applications in integrated optical components. Based on the self-imaging of multimode interference couplers, we analyze the general self-imaging properties in line-tapered multimode interference couplers in detail, and find the positions of images which directly relate to the position of input field, the position number, the initial width of line-tapered multimode interference couplers and transition ratio. The analytical expression of image positions and some characteristics are summarized. Finally, the guide-mode propagation analysis and finite-difference beam propagation method （FDBPM） are used to confirm the analytical results. These conclusions can be used to exactly get the positions of images without complex calculation, which provide a theoretical basis and design reference of integrated optical components with line-tapered multimode interference couplers.

关 键 词：集成光学 锥形多模干涉耦合器 成像位置 导模传输分析法 有限差分光束传输法 

分 类 号：TN252[电子电信—物理电子学]