title: Quantized pulse separations of phase-locked soliton molecules in a dispersion-managed mode-locked Tm fiber laser at 2  μm.
abstract: We report, for the first time to the best of our knowledge, the discovery of quantized pulse separations between phase-locked soliton pairs in a thulium-doped fiber laser at the wavelength range of 2 μm. The soliton pairs are formed by the nonlinear binding interaction between the solitons and dispersive waves, and the two lowest-order Kelly sidebands drive the interaction in these soliton pairs and fix the pulse separations of the soliton pairs to a discrete set of values. Our experimental observations are well confirmed by numerical simulations.
authors.forename: Pan
authors.initials: P
authors.lastname: Wang
authors.forename: Xiaosheng
authors.initials: X
authors.lastname: Xiao
authors.forename: Changxi
authors.initials: C
authors.lastname: Yang