中文摘要：

在光纤环形腔激光器中引入周期极化反转铌酸锂（PPLN）光波导，用该激光器产生的连续光作为抽运光和控制光，使其与外加的信号光发生非线性效应实现可调谐波长转换。介绍了基于准相位匹配的PPLN光波导中的和频与差频级联型全光波长转换器的基本原理，对抽运光、信号光、控制光以及转换光的光功率随着PPLN光波导的变化进行了模拟，还对转换效率随着转换光波长的变化进行了数值计算，实验验证了该波长转换器的可调谐性。

英文摘要：

Introducing a periodically poled LiNbO3 （PPLN） waveguide in fiber ring lasers, tunable wavelength conversion has been realized by the nonlinear interactions between the launched signals and the pump and control waves generated through the fiber ring lasers. The principle of all-optical wavelength conversion based on the cascaded sum- and difference-frequency generation in the quasi-phase-matched PPLN waveguide is introduced in the article. The evolution of the power of the pump, the signal, the control and the converted waves along the PPLN waveguide has been numerically simulated respectively. The dependence of the conversion efficiency on the wavelength of the converted wave was calculated. Finally, the tunability of the wavelength conversion was experimentally verified.