Fig. 1: Schematic of a perturbed (solid) and unperturbed (dotted) optical soliton.
From: Observation of the universality of nonlinear mode coupling in a fibre laser
a Soliton (blue) and linear (orange) dispersion relations relate the propagation constant (prop. const.) to frequency, centered at ω0. The dispersion relation perturbed by β3 > 0 intersects the soliton line at ωr, while the ideal one does not. b Theoretical spectra. c Theoretical electric field envelopes.
