马赫-曾德尔干涉仪
消光比
干涉测量
光学
折射率
包层(金属加工)
光开关
材料科学
插入损耗
波导管
功率分配器和定向耦合器
光束传播法
芯(光纤)
补偿(心理学)
光电子学
物理
波长
冶金
心理学
精神分析
作者
Jun Wang,Yi Jia,Lijun Guo,Peng Liu,Trevor J. Hall,DeGui Sun
标识
DOI:10.1016/j.optlastec.2016.10.016
摘要
For the most popular structure of planer lightwave circuit (PLC) 2×2 thermo-optic switches, Mach-Zehnder interferometer (MZI), a full range of splitting ratio errors of directional coupler (DC) are investigated. All the parameters determining the splitting ratio are the dimensions and the refractive indices of the waveguide core and cladding layers. In this work, the coherent relationships between the waveguide size and the refractive indices are analyzed and then the error compensation between the width and the refractive index of waveguide core, and the controllable effect of over clad layer refractive index error upon the MZI-type optical switch are all discovered with numerical calculation and BPM simulations. Then, an MZI-type 2×2 thermo-optic switch having a higher error tolerance is established with the efficient optimizations of all the 3 dB-DC parameters. As a result, for the symmetric MZI switch, an insertion loss of 1.5 dB and optical extinction ratio of over 20 dB are realized for the average tolerance of±5.0%. An asymmetric arm optical phase and unequal arm lengths is also employed to improve the uniformities of insertion loss. The agreements between the designs and the experiments are recognized, leading to a wide adoption of practical silica-PLC optical switch products.
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