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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 .
The characteristics of periodically poled LiNbO all-optical switch based on the second order nonlinearity effect of sum frequency and difference frequency cascade are studied theoretically, and the analytical expression of small signal approximation of coupled mode equations under the condition of phase matching is given The equations are solved numerically and the relationship between the power of the signal and the power of the control signal is discussed.It is analyzed that the polarization reversal grating period, the temperature of the light, the wavelength of the control light The tolerance characteristics of isoparameters relate to the length of the interaction and the temperature of the crystal.