三维脊型光波导模斑转换器的设计和优化  

A Design of 3D Spot-size Converter Based on a Rib Waveguide Structure

作　　者：张夕飞[1] 肖金标[1] 蔡纯[1] 张明德[1] 孙小菡[1] 

机构地区：[1]东南大学电子工程系,江苏南京210096

出　　处：《计算物理》2005年第2期171-178,共8页Chinese Journal of Computational Physics

基　　金：江苏省科技攻关(2002省321);国家863计划(2002AA312230)资助项目

摘　　要：　在三维有限差分束传播法对脊形光波导的结构参数分析和优化的基础上,对单模光纤和脊形光波导连接耦合用模斑转换器进行了深入的研究,重点分析了影响模斑转换器性能的各种因素,如侧面边界、长度、大端宽度和厚度,以及连接光纤和模斑转换器的过渡波导的有关参数.仿真结果表明,三维锥形光波导模斑转换器大端宽度和厚度在11 5～13 5μm和4 5～6 5μm之间,且长度为200～500μm时插入损耗可低达2dB,比二维锥形光波导模斑转换器的插入损耗约减小2dB,其对横向偏移的容差也远远高于二维锥形光波导模斑转换器,合理的使用非线性边界的模斑转换器可以获得比线性边界的模斑转换器更小的插入损耗;过渡波导的宽度、芯层厚度应和三维锥形光波导模斑转换器的大端宽度和厚度一致,且其长度为150μm左右时损耗较小;另外,此类模斑转换器在减小耦合损耗的同时,还可以有效的进行光波模式的转换.A 3D trapered spot-size converter(3D-SSC) on a rib cross-sectional optical waveguide, one of the key components in photonic devices connecting with single mode optical fibers,is investigated through simulating lightwave transmission in this component based on 3D-FD beam propagation method.Geometry parameters,such as laterally boundaries,length,width of the large section,thickness and those of the transitional optical waveguide for connecting SMOF to 3D-SSC are discussed and analyzed.The simulation shows that the insert loss of 3D-SSC can be lower than 2?dB as the width in the area of 11.5?μm～13.5?μm and the thickness in the area of 4.5?μm～6.5?μm at the large end of the taper when the taper length is in the region of 200?μm～500?μm.The capability and the alignment tolerance of the 3D-SSC is better than those of the planar SSC,and the 3D-SSC with a nonlinear lateral boundary acquires lower insertion loss than that with a linear lateral boundary.It is found that the 3D-SSC converts gradually the guided modes from multi-mode to single mode finally.

关 键 词：模斑转换器 脊型光波导 优化 脊形光波导 设计 三维有限差分 插入损耗 过渡波导 非线性边界 参数分析 束传播法 单模光纤 仿真结果 横向偏移 耦合损耗 厚度 宽度 锥形 长度 500 连接 减小 二维 容差 

分 类 号：TN252[电子电信—物理电子学] TV697.32[水利工程—水利水电工程]