周期性极化铌酸锂波导全光开关特性分析

从理论方面研究了基于和频与差频级联二阶非线性效应的周期性极化铌酸锂波导全光开关的特性,给出了耦合模方程在满足相位匹配条件下小信号近似的解析表达式.用数值方法求解耦合模方程,讨论了相位失配情况下输出的信号光功率与控制光功率的关系.分析了全光开关器件的极化反转光栅周期、晶体温度、控制光波长等参量的容差特性与相互作用长度和晶体温度的关系 关键词： 级联二阶非线性 光开关 准相位匹配 周期性极化铌酸锂

Analysis of all-optical switching in periodically poled LiNbO3 waveguide

The characterization of all optical switching based on cascaded second order nonlinearity of sum frequency generation (SFG) and differential frequency generation (DFG) in periodically poled lithium niobate (PPLN) waveguide was analyzed theoretically. The small signal solution of the couple mode equation was given at phase matched firstly.Then based on solving the couple mode equation numerically, the dependence of the signal power on the gate power was given under different phase dismatch conditions. Finally, the dependence of the tolerance of the grating period, the crystal temperature and the gate power on the interaction length and the crystal temperature were analyzed.