The experiment reports a kind of L-band dissipative soliton resonance (DSR) nanosecond Er-doped fiber laser. The passive mode-locked L-band DSR pulse is achieved in a figure-eight structure by using the nonlinear-amplifying-loop-mirror (NALM). The repetition rate of pulse is 468 kHz. At the maximum pump power of 398 mW, the output power is 25 mW with a pulse energy of 45 nJ. By adjustment of polarization state in cavity, the output pulse can be switched among 4 different DSR states with central wavelength of 1572, 1585, 1590 and 1605 nm discretely, presenting different peak power and pulse width. We can determine that the adjustment of polarization state changes the loss spectra of cavity and the 4 DSR states operate in different balance points. The tunable DSR pulse duration is from 120 to 150 ns by increasing the central wavelength.

中文翻译：

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L波段波长可切换耗散孤子共振掺铒光纤激光器

实验报道了一种L波段耗散孤子共振(DSR)纳秒掺铒光纤激光器。无源锁模 L 波段 DSR 脉冲是通过使用非线性放大环路镜 (NALM) 在 8 字形结构中实现的。脉冲重复率为 468 kHz。在 398 mW 的最大泵浦功率下，输出功率为 25 mW，脉冲能量为 45 nJ。通过调整腔内偏振态，输出脉冲可在中心波长为1572、1585、1590、1605nm的4种不同DSR状态间切换，呈现不同的峰值功率和脉冲宽度。我们可以确定偏振态的调整改变了腔的损耗谱，4个DSR态在不同的平衡点上运行。通过增加中心波长，可调谐 DSR 脉冲持续时间为 120 至 150 ns。