A passively fast polarization switching erbium-doped fibre laser using quantum dot tungsten disulfide (QDWS 2 ) as a saturable absorber (SA) has been proposed. It could generate polarization domain walls (PDWs). The PDWs‘ spectrum can be divided into two separated spectra, which are orthogonally polarized. In detail, the horizontal polarization component wavelength is centred at 1561.1 nm with a repetition rate of 19.347 MHz, a pulse duration of 30 ns, and a signal-to-noise ratio of 73.2 dB at the maximum pump power. The vertical polarization component wavelength is centred at 1561.5 nm, with a pulse duration of 20.4 ns. To the best of our knowledge, this is the first report of a polarization domain wall generated by a QDWS 2 -SA. These results provide a platform to investigate anticorrelated polarization dynamics in quasi-isotropic fibre lasers. Moreover, their robustness and attractive properties could find potential applications in optical communications, da...

中文翻译：

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量子点二硫化钨在准各向同性光纤激光器中的极化畴壁孤子

已经提出了使用量子点二硫化钨（QDWS 2）作为可饱和吸收剂（SA）的无源快速偏振开关掺er光纤激光器。它可能会产生极化畴壁（PDW）。PDW的光谱可以分为正交偏振的两个分离的光谱。详细地说，在最大泵浦功率下，水平偏振分量的波长以1561.1 nm为中心，重复频率为19.347 MHz，脉冲持续时间为30 ns，信噪比为73.2 dB。垂直偏振分量的波长以1561.5 nm为中心，脉冲持续时间为20.4 ns。据我们所知，这是QDWS 2 -SA产生的极化畴壁的首次报道。这些结果为研究准各向同性光纤激光器中的反相关偏振动力学提供了一个平台。