LiNbO_3 1×2非对称电极Y分叉数字光开关的研究

Study on LiNbO_3 1×2 asymmetrical electrode Y branch digital optical switch

文章提出一种关于非对称电极低串扰数字光开关的新型设计方案,在Y分叉后端引入S弯曲波导,通过在Y分叉处的非对称电极和弯曲波导的弯曲电极处施加一定的同步电压,实现了比没有S弯曲的开关更低的串扰。此种设计采用有限差分光束传播方法(FDBPM)来分析,模拟结果显示,在光波长为1.55μm时,开关电压8 V,串扰<-25 dB。

A novel design scheme for digital optical switch with high extinction ratio by employing S curve waveguide at the end of the Y branch is proposed. Higher extinction ratio than that of the device without S curve waveguide is obtained by applying certain synchronous voltage to the Y branch and the curve electrode of the S curve waveguide. Finite Difference Beam Propagation Method （FDBPM） is used to simulate the performance of the design, and the results show that the extinction ratio can exceed --25 dB with the switch voltage of about 8 V at 1.55 μm.