We report the first experimental observation, to the best of our knowledge, of soliton molecules in a robust all polarization-maintaining (PM) mode-locked fiber laser with a nonreciprocal phase bias that results in a low self-starting threshold and stable mode locking. Through elaborately tuning the waveplate in the cavity, calibrating the laser pulse from conventional soliton to soliton molecules is implemented, and versatile soliton molecules including harmonic soliton pairs, tightly or loosely bound soliton quartets, multipulse bound solitons are achieved and manipulated at different pump powers. Theoretical investigations are established to elucidate the soliton molecules spectral characteristics with various phase differences and time separations in the cavity that elicit good concurrence with achieved experimental results. The achieved results both rich the nonlinear dynamics in fiber lasers and pave the potential applications for this excellent architecture fiber laser.

中文翻译：

---

在具有非互易相位偏置的稳健全 PM 锁模光纤激光器中观察孤子分子

据我们所知，我们报告了对具有非互易相位偏置的强大的全保偏 (PM) 锁模光纤激光器中孤子分子的首次实验观察，该激光器具有低自启动阈值和稳定的锁模. 通过对腔内波片的精细调谐，实现了从传统孤子到孤子分子的激光脉冲校准，实现了包括谐波孤子对、紧密或松散结合的孤子四重奏、多脉冲结合的孤子在内的多功能孤子分子，并在不同的泵浦功率下进行操作。建立了理论研究以阐明空腔中具有各种相位差和时间间隔的孤子分子光谱特性，这与所取得的实验结果具有良好的一致性。