基于二维多模干涉效应的N×N光开关模型

报道了由两个N×N三维多模干涉耦合器和一段阵列相移波导组成的三维光开关.首先利用导模传输法分析了三维多模干涉耦合器的一般成像原理,并推导出了其成像位置以及相位矩阵.在此基础上,通过场传输矩阵法建立了光开关的传输方程.利用该传输方程计算得到了光开关工作时,阵列相移波导的相位条件,并通过三维有限差分光束传输法进行仿真验证,给出了光开关工作时的插损、串扰指标,以及光开关输出功率随相移波导相位变化的关系.

Modeling of N×N Optical Switch Based on Two-demionsional Multi-mode Interference Effects

A three-dimensional optical switch is introduced which is composed of two N×N three-dimensional multi-mode interference couplers and an array of phase shift waveguide. Firstly, the general imaging principle of three dimensional multimode interference is analyzed by the guided-mode propagation method,and the imaging position and phase matrix are deduced. And the transmission equation of optical switch is set up by the transmission matrix method.The phase condition when the optical switch works is calculated by the transmission equation,and verification and the simulation is completed by three-dimensional finite-difference beam propration method. The insertion loss and crosstalk when the optical switch works are given, and the relation between the output power and the phase shift of phase array waveguide are obtained.