一种基于多模干涉耦合器的集成光开关研制

Study on an integrated optical switch based on multimode interference coupler

设计并制作了一种采用InP/InGaAsP材料的2×2基于多模干涉(MMI)器的Mach-Zehnder干涉仪(MZI)光开关,用三维有限差分束传播法(3D-BPM)对器件进行了优化设计与模拟分析。开关端口设计为单模波导且对偏振不敏感,采用电流注入调制相移区折射率,当折射率的改变引起π相位差时实现开关状态转换。测试结果表明,当注入电流达到43 mA时光信号从交叉端口交换到直通端口,开和关状态的串扰分别为-19.2 dB和-14.3 dB。

An InGaAsP/InP 2×2 Mach-Zehnder interferometer（MZI） optical switch based on multimode interference（MMI） couplers is presented.The switch characteristics are simulated using a three-dimensional beam propagation model.The switch structure is designed to be single mode operation and insensitive to polarization.When injected current gives rise to a change in the refractive index and causes a π-phase shift,the light is routed to the bar port resulting in space switching of the signal.The light signal can be switched from cross port to bar port with an injection current of 43 mA.The measured crosstalk is-19.2 dB and-14.3 dB at the on and off state,respectively.