Study of Pulse Formation in an EDFL Under a Large Dispersion Variation Hybridly Mode-Locked by Graphene and Nonlinear Polarization Rotation

In this work, we present a detailed experimental study of pulse formation mechanism in an EDFL, hybridly mode-locked by use CVD monolayer graphene onto D-shaped optical fiber and nonlinear polarization rotation (NPR), under large intracavity dispersion influence (up to 100 times) ranging from 12.3 1382 m cavity lengths. Analyzing the spectral evolution, temporal soliton behaviors pulse, our results revealed presence four laser operating regimes with non-soliton short ultralong lengths, all related graphene/NPR nonlinearities, propagation influences.