Abstract
A numerical study is made on dynamics of unbounded bright/dark spatial soliton (UBSS/DSS) in self-defocusing Kerr media with small χ (5) self-focusing nonlinearity. Induced by the non-soliton part in the initial condition, soliton scattering process is followed by uneven energy redistribution between the scattered wavepackets with the additional radiation taking part in. Enhanced by the χ (5) self-focusing effect with modification of the cubic defocusing nonlinearity, the resultant propagation of the coupled UBSS/DSS channels presents a striking contrast in brightness/blackness. Stable propagation of such soliton pair requires exacting physical conditions composed of appropriate ratio of cubic-quintic nonlinearity and initial repulsive force of sufficient strength matched with fitting input light power.
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