Cross phase modulation (XPM) can induce soliton trapping in nonlinear medium, which has been employed to achieve vector soliton, optical switching, and optical analog of gravity‐like potentials. Here, the first observation of a novel soliton operation is reported whose wavelength exhibits redshift and blueshift periodically in a mode‐locked fiber laser under appropriate birefringence and dispersion map. XPM dominates the dynamics by inducing and sustaining the vector asymmetrical soliton (VAS) with spectral period doubling, and exhibits a unique trajectory of pulse trapping. The XPM‐induced VAS is an idiosyncratic steady state featured with asymmetry in the model based on the coupled Ginzburg–Landau equation, which depicts the distinct pulse features in comparison with vector soliton, soliton molecule, and traditional period‐doubling evolutions. The two orthogonal polarized directions of mode‐locked fiber laser can be regarded as the XPM‐coupled dissipative resonators guiding the further study of the optical nonlinear dynamics and chaos for soliton, which is helpful to laser design and brings useful insights into nonlinear science and applications.

中文翻译：

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XPM引起的矢量非对称孤子在锁模光纤激光器中的频谱周期加倍

交叉相位调制（XPM）可以在非线性介质中引起孤子俘获，已将其用于实现矢量孤子，光学开关和重力势能的光学模拟。在这里，首次报道了一种新型孤子操作的观察结果，该波长在锁模光纤激光器中在适当的双折射和色散图下，其波长周期性地呈现红移和蓝移。XPM通过诱导和维持矢量不对称孤子（VAS）并以频谱周期加倍来控制动力学，并表现出独特的脉冲捕获轨迹。XPM诱发的VAS是基于耦合的Ginzburg-Landau方程的模型中具有不对称性的特质稳态，与矢量孤子，孤子分子和传统的倍频演化相比，它描绘了独特的脉冲特征。