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Mutually induced soliton polarization instability in a bidirectional ultrafast fiber laser
Optics Letters ( IF 3.6 ) Pub Date : 2021-09-27 , DOI: 10.1364/ol.440089
Kai Yang , Ti-Jian Li , Xing-Di Li , Ji-Xiang Chen , Meng Liu , Hu Cui , Ai-Ping Luo , Wen-Cheng Xu , Zhi-Chao Luo

The bidirectional ultrafast fiber laser is a promising light source for dual-comb applications. The counter-propagating geometry could lead to soliton interaction through gain sharing, as well as the possible outcome of polarization instability. However, the polarization dynamics hidden behind the soliton interaction process in bidirectional fiber lasers were rarely investigated. Herein, we report on the polarization instability induced by the mutual soliton interactions through fiber gain in a bidirectional mode-locked fiber laser. Depending on the adjustment of the intracavity birefringence, the polarization states of two counter-propagating solitons can exhibit similar periodical polarization switching behaviors with a polarization-rotating transition state. The successive interactions of the bidirectional solitons mediated by the polarization cross-saturation effect of gain fiber could be responsible for the soliton polarization instability. These findings, in addition to the fundamental interest of the soliton nonlinear dynamics in dissipative optical systems, also open up new possibilities for creating dynamical control of the soliton polarization state and performance improvement in bidirectional ultrafast fiber lasers.

中文翻译:

双向超快光纤激光器中的互致孤子偏振不稳定性

双向超快光纤激光器是一种很有前途的双梳应用光源。反向传播几何可能通过增益共享导致孤子相互作用,以及极化不稳定性的可能结果。然而,很少有人研究隐藏在双向光纤激光器中孤子相互作用过程背后的偏振动力学。在此,我们报告了通过双向锁模光纤激光器中的光纤增益相互孤子相互作用引起的偏振不稳定性。根据腔内双折射的调整,两个反向传播的孤子的偏振态可以表现出类似的周期性偏振切换行为,具有偏振旋转过渡态。由增益光纤的偏振交叉饱和效应介导的双向孤子的连续相互作用可能是孤子偏振不稳定性的原因。这些发现,除了对耗散光学系统中孤子非线性动力学的基本兴趣之外,还为创建孤子偏振态的动态控制和双向超快光纤激光器的性能改进开辟了新的可能性。
更新日期:2021-10-02
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