相移光栅作为窄带宽透射型滤波器件在光纤激光器设计中有很高的应用价值。研究了基于啁啾相移光栅的环形腔掺铒光纤激光器的仿真模型。利用传输矩阵法仿真了啁啾相移光栅的传输谱, 并对行波速率方程进行数值化模拟, 得到了激光器工作时, 掺铒光纤上能级粒子数、输出激光功率时域变化以及输出激光频谱。仿真采用功率为0.3 W的980 nm泵浦源得到了输出约为0.078 W,带宽为0.02 nm的连续光输出。同时, 详细分析了输出激光功率随泵浦功率和输出耦合比值的变化情况。仿真结果表明, 输出激光功率随泵浦光功率呈线性变化, 存在一个最优的输出耦合比值使输出光功率值最大。

The simulation model of a ring Er-doped fiber laser based on chirped phase shifted fiber Bragg grating (CPSFBG) is researched. The transmission spectrum of CPSFBG is obtained through transmission matrix method and traveling wave rate equation is performed numerically to obtain Er-doped fiber up-level particle number, output laser power time domain variation and output laser spectrum during laser operation. The pumping source with 0.3 W power and 980 nm is used to obtain the continuous laser output with 0.078 W output and 0.02 nm bandwidth. The output laser power linearly changing with the ratio of pumping power and output coupling is analyzed in detail. Simulation results show that output laser power changes linearly with pumping laser power and there is an optimal output coupling ratio to realize the maximum laser power.