A numerical study on evolution of a dark soliton-like beam in self-defocusing media with measurable fifth-order focusing nonlinearity

This letter addresses a numerical study on evolution of a dark soliton-like beam in self-defocusing media with measurable fifth-order focusing nonline arity. Modified by the competing nonlinearities the incident dark soliton-l ike beam of appropriate parameters evolves into a dark solitonic channel tw inned with its bright companion born of the additional radiation. Stable pr opagation takes shape of the divergent dark and bright solitonic channels w hen energy redistribution among the solitonic channels and the background k eeps up to a dynamical equilibrium. (C) 2001 Elsevier Science B.V. All righ ts reserved.