为了研究可饱和吸收体参数对全正色散光纤激光器输出脉冲特性的影响, 建立全正色散光纤激光器模型, 通过求解非线性薛定谔方程获得全正色散光纤激光器的输出脉冲拟合因子、时域脉宽以及峰值功率。研究了不同调制深度、饱和功率和不饱和吸收损耗下全正色散光纤激光器的输出脉冲参数。仿真结果表明可饱和吸收体参量的变化会影响激光器输出脉冲的宽度、峰值功率以及形状, 优化可饱和吸收体参数可以在全正色散腔中产生窄脉宽高功率的抛物线脉冲。数值结果进一步丰富了全正色散光纤激光器输出脉冲特性的理论研究。

In order to study the influence of saturable absorber parameters on the output pulse characteristics of the all-normal-dispersion fiber laser, the model of the all-normal-dispersion fiber laser is established, and the fitting factor, pulse width and peak power of pulse are obtained by solving the nonlinear schrodinger equation. The output pulse parameters of all-normal-dispersion fiber laser with different modulation depth, saturation intensity and nonsaturable absorption are studied. Simulation results show that the variation of the parameters of the saturable absorber can affect the pulse duration, peak power and shape of the output pulse. It also shows that the optimized parameters of saturable absorber can generate parabolic pulse with narrow pulse width and high power. The numerical results enrich the theoretical research on the characteristics of output pulse in an all-normal-dispersion fiber laser.