A noise-like pulse (NLP) is generated in an anomalous-dispersion passively mode-locked erbium-doped fiber laser using graded-index multimode fiber (GIMF) as the all-fiber saturable absorber (SA) for the first time. By splicing two sections of bending GIMF at both ends of a single mode fiber and optimizing the birefringence and nonlinear parameters, stable NLP mode-locking operation can be achieved within a wide pump power range. Meanwhile, the performances of NLP mode-locking have been analyzed experimentally by changing the length of the GIMF.

中文翻译：

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基于非线性多模干涉的掺-光纤激光器产生类噪声脉冲

首次使用渐变折射率多模光纤（GIMF）作为全光纤可饱和吸收体（SA），在异常色散被动锁模掺光纤激光器中产生了类似噪声的脉冲（NLP）。通过在单模光纤的两端拼接弯曲GIMF的两个部分，并优化双折射和非线性参数，可以在较宽的泵浦功率范围内实现稳定的NLP锁模操作。同时，通过改变GIMF的长度，对NLP锁模的性能进行了实验分析。