Vector-soliton collision dynamics in nonlinear optical fibers

Details Vector-soliton collision dynamics in nonlinear optical fibers Vector-soliton collision dynamics in nonlinear optical fibers

2005-02-24

arxiv.org/abs/nlin/0502056v1

Nonlinear Sciences

Pattern Formation and Solitons

32 pages, submitted to Physical Review E

Scientific paper

10.1103/PhysRevE.71.056605

We consider the interactions of two identical, orthogonally polarized vector solitons in a nonlinear optical fiber with two polarization directions, described by a coupled pair of nonlinear Schroedinger equations. We study a low-dimensional model system of Hamiltonian ODE derived by Ueda and Kath and also studied by Tan and Yang. We derive a further simplified model which has similar dynamics but is more amenable to analysis. Sufficiently fast solitons move by each other without much interaction, but below a critical velocity the solitons may be captured. In certain bands of initial velocities the solitons are initially captured, but separate after passing each other twice, a phenomenon known as the two-bounce or two-pass resonance. We derive an analytic formula for the critical velocity. Using matched asymptotic expansions for separatrix crossing, we determine the location of these "resonance windows." Numerical simulations of the ODE models show they compare quite well with the asymptotic theory.

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