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提出了一种基于深刻蚀脊形光波导带模斑转换器的多功能 2× 2GaAs/GaAlAs多模干涉型光开关 ,并用变量变换级数展开法及三维有限差分束传播法对其进行了模拟分析与优化设计 .结果表明 ,通过控制多模波导中央的两段Schottky电极 ,器件可实现交叉态、直通态及 3dB耦合器功能 ,并有较大的制作容差、较宽的工作带宽 ,只须一个多模波导 ,器件结构紧凑 .采用深刻蚀脊形光波导能够满足多模干涉型器件的精确自镜像要求 ,并使输入 /输出光波导在单模工作下有较大的横截面 ,较低的弯曲损耗及较小的耦合串扰 .通道末端引入的模斑转换器可方便地与单模光纤连接耦合 .
A multifunctional 2 × 2GaAs / GaAlAs multimode interference optical switch based on deep etched ridgeband waveguide mode converter was proposed and simulated by using variable-shift series expansion method and three-dimensional finite difference beam propagation Analysis and optimization design.The results show that by controlling two Schottky electrodes in the center of the multimode waveguide, the device can achieve the cross-state, straight-through state and 3dB coupler function with larger production tolerance, wider working bandwidth, and only A multi-mode waveguide is required, and the device has a compact structure. The deep etched ridge waveguide can satisfy the precise self-mirroring requirement of multimode interference devices and make the input / output optical waveguide have a larger cross-section under single-mode operation. Low bending loss and less coupling crosstalk.The die spot converter introduced at the end of the channel can be easily coupled with the single mode fiber connection.