Abstract
Characterized by particle-like behaviors, soliton molecules comprise abundant and interesting multi-soliton dynamics and further unveil vivid pulse-interaction scenarios towards the research community of ultrafast fiber lasers. Here, we report the formation of dispersion-managed solitons (DMSs) in an all-fiber laser passively mode-locked by a 45° tilted fiber grating (45° TFG) near the zero-dispersion regime. Particularly, typical DMS singlets are observed, possessing a broadband and smooth spectral shape. Besides, based on the reinforced stretching-compressing process during the pulse propagation, various multi-pulse DMS molecules are also discovered. Moreover, the transient soliton dynamics of dual-pulse and triple-pulse DMS molecules covering the timescale over hundreds of round trips are illustrated based on dispersive Fourier transformation (DFT) technique. The investigation of multi-soliton compounds, caused by direct soliton interaction, probably paves access to the explorations of nonlinear dynamics in mode-locked lasers.
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