三维脊型光波导模斑转换器的设计和优化

计算物理 ›› 2005, Vol. 22 ›› Issue (2): 171-178.

三维脊型光波导模斑转换器的设计和优化

张夕飞, 肖金标, 蔡纯, 张明德, 孙小菡

东南大学电子工程系, 江苏南京 210096

收稿日期:2003-10-13 修回日期:2004-02-13 出版日期:2005-03-25 发布日期:2005-03-25
作者简介:张夕飞(1970-),男,江苏洪泽,硕士生,从事光器件的研究,杭州市浙江工业大学理学院310014.
基金资助:
江苏省科技攻关(2002省321);国家863计划(2002AA312230)资助项目

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

ZHANG Xi-fei, XIAO Jin-biao, CAI Chun, ZHANG Ming-de, SUN Xiao-han

Dept. of Electronics Engineering, Southeast University, Nanjing 210096, China

Received:2003-10-13 Revised:2004-02-13 Online:2005-03-25 Published:2005-03-25

摘要/Abstract

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.

关键词: 三维束传输法, 三维光波导锥形模斑转换器, 单模光纤, 连接耦合

Abstract: 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.

Key words: 3D-BPM, 3D tapered waveguide spot-size converte (3D-T-SSC), single mode optical fibers (SMOF), butt coupling

中图分类号:

TN256

张夕飞, 肖金标, 蔡纯, 张明德, 孙小菡. 三维脊型光波导模斑转换器的设计和优化[J]. 计算物理, 2005, 22(2): 171-178.

ZHANG Xi-fei, XIAO Jin-biao, CAI Chun, ZHANG Ming-de, SUN Xiao-han. A Design of 3D Spot-size Converter Based on a Rib Waveguide Structure[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2005, 22(2): 171-178.