In this article, the numerical simulations and experimental investigations on the evolution of soliton rain in Tm-doped fiber laser were carried out, based on the nonlinear polarization rotation (NPR) technique. By carefully adjusting the polarization controller (PC) in the cavity, the soliton rain phenomenon was observed, in which the pulse train length of a drifting solitons was about 0.36 μs, 0.77 μs, and 0.92 μs, respectively. In order to further analyze the influence of PC on the formation of soliton rain, the corresponding numerical analysis was performed. The numerical simulation was in consistent with the experimental results. Our present research work was very meaningful to further investigate the nonlinear dynamics mechanisms of ultrafast fiber laser.

中文翻译：

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掺铥无源锁模全光纤激光器中孤子雨的演化

本文基于非线性偏振旋转（NPR）技术，对掺铥光纤激光器中孤子雨的演化进行了数值模拟和实验研究。通过仔细调整腔内的偏振控制器（PC），观察到孤子雨现象，其中漂移孤子的脉冲串长度分别约为0.36 μs、0.77 μs和0.92 μs。为了进一步分析PC对孤子雨形成的影响，进行了相应的数值分析。数值模拟与实验结果一致。我们目前的研究工作对于进一步研究超快光纤激光器的非线性动力学机制非常有意义。