Reconfigurable mode switch based on lithium niobate film

The invention discloses a structural design of a reconfigurable mode switch based on a lithium niobate film, and belongs to the field of optical waveguide switches and mode division multiplexing. The basis of the invention is the electro-optical effect of the lithium niobate crystal. The main structure is two symmetrical directional coupling units DC1 and DC2, when an electrode does not work, an E21 mode is coupled in the DC1 and enters an adjacent waveguide, and an E31 mode is coupled in the DC2 and enters the adjacent waveguide. And when the working voltage in the DC1 is 25.8 V, the coupling of the E21 mode at the DC1 is almost completely inhibited, and when the working voltage in the DC2 is 16.9 V, the coupling of the E31 mode at the DC2 is completely inhibited, so that the reconfigurable differential multiplexing of the waveguide mode is realized, and a choice is provided for a reconfigurable mode division multiplexing network. 本发明公开了一种基于铌酸锂薄膜的可重构模式开关的结构设计，属于光波导开关和模分复用领域。本发明的基础为铌酸锂晶体的电光效应。本发明主要的结构为两个对称定向耦