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Hybrid mode-locking has been widely used in enhancing pulse quality, howeverhow the hybrid two mode-locking techniques work remains unclear. In this paper,we experimentally investigate three pulse formation mechanisms in saturableabsorbers (SA) and nonlinear polarization evolution (NPE) passively hybridmode-locked fiber laser, which are SA-dominated, NPE-dominated, and SA-NPEco-domination switching. Clarified the exists dynamic competition andcooperation among the mode-locking techniques. For the first time, the methodof simulating filtered gain spectrum with customized filtering is proposed, andthe switching of pulse formation mechanisms is numerically investigated usingthe coupled Ginzburg-Landau equations. Our results deepen the understanding ofhybrid mode-locked fiber lasers and provided a foundation for multi-wavelengthmode-locked lasers with different mode-locking techniques in a single cavity.

Pulse formation mechanisms switching in hybrid mode-locked fiber laser