Abstract We report on the generation of high-order solitons with order continuously adjustable in an erbium-doped fiber laser mode-locked by a graded index multimode fiber–step index multimode fiber–graded index multimode fiber (GIMF–SIMF–GIMF) saturable absorber (SA). The SA has advantages of high damage threshold, easy fabrication and low cost. The fundamental soliton to eleventh-order soliton were obtained by adjusting the pump power and PC. It was found that both increasing pump power and adjusting PC can affect the solitons splitting during experiment. The generation of high-order solitons is due to the peak power clamping effect of laser cavity and the pulse shaping effect of GIMF–SIMF–GIMF SA. Last but not least, this is the first time to adjust the order of solitons continuously from the first to eleventh in a fiber laser mode-locked by GIMF–SIMF–GIMF SA.

中文翻译：

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基于GIMF-SIMF-GIMF可饱和吸收体的光纤激光器中阶次连续可调的高阶孤子的产生

摘要 我们报告了在由渐变折射率多模光纤-阶跃折射率多模光纤-渐变折射率多模光纤 (GIMF-SIMF-GIMF) 可饱和吸收器锁模的掺铒光纤激光器中产生阶数连续可调的高阶孤子(SA)。SA具有损伤阈值高、制造容易、成本低等优点。通过调整泵浦功率和 PC 获得了基本孤子到十一阶孤子。发现增加泵浦功率和调整PC都会影响实验过程中的孤子分裂。高阶孤子的产生是由于激光腔的峰值功率钳位效应和 GIMF-SIMF-GIMF SA 的脉冲整形效应。最后但并非最不重要的，