Multiple dissipative solitons with equal and invariant temporal spacing in Yb-doped all-normal-dispersion fiber lasers

Abstract

A new category of multiple dissipative solitons (DSs) with equal and invariant temporal pulses spacing was observed in a Yb-doped passively mode-locked all-normal-dispersion fiber laser based on nonlinear polarization rotation (NPR). It is observed that the number of DSs in a pulse bunch per roundtrip can be adjusted continuously by the pump power while the temporal spacing between each pulse remains invariant and is independent of the cavity‘s length. A theoretical model corresponding to the experimental configuration established to simulate the pulse generation based on coupled nonlinear Schrödinger equations. It is found that the experimental phenomenon can be well predicted by the theoretical model. It is expected that the multiple DSs with equal-temporal spacing may find applications in sensing or optical communications and also provide fundamental evidence in soliton dynamics and nonlinear systems.