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基于光纤中的耦合波方程和琼斯矩阵建立了非线性偏振旋转锁模光纤激光器的数值模型,模拟研究了抽运激光功率抖动和腔长抖动对锁模激光器输出脉冲幅值抖动的影响。结果表明,抽运激光功率Pp的抖动对锁模激光器脉冲幅值抖动影响较大,幅值抖动随着Pp抖动的增大而增大,当抽运功率有±3%的随机抖动时,锁模脉冲幅值的均方根(RMS)值达到0.82%,峰-谷(P-V)值达到2.84%;而腔长抖动对脉冲幅值抖动影响较小,但腔长抖动会带来较大的脉冲时间抖动。因此要得到极低时间抖动和幅值抖动的锁模脉冲,必须对抽运激光功率和腔长的抖动加以控制。
Based on the coupled wave equation in optical fiber and the Jones matrix, a numerical model of a nonlinear polarization rotation mode-locked fiber laser is established. The effects of pumping laser power jitter and cavity length jitter on the output pulse amplitude jitter of the mode-locked laser are studied. The results show that the jitter of pumping laser power Pp has a great influence on the pulse amplitude jitter of the mode-locked laser, and the amplitude jitter increases with the increase of Pp jitter. When the pumping power has ± 3% random jitter, The RMS value of the mode pulse reaches 0.82% and the peak-to-valley (PV) value reaches 2.84%. However, the cavity length jitter has less effect on the pulse amplitude jitter, but the cavity length jitter will bring about a larger Pulse time jitter. Therefore, to obtain mode-locked pulses of very low time jitter and amplitude jitter, the jitter of the pump laser power and cavity length must be controlled.