Interaction of a soliton with a local defect in a fiber Bragg grating

Details Interaction of a soliton with a local defect in a fiber Bragg grating Interaction of a soliton with a local defect in a fiber Bragg grating

2002-12-12

arxiv.org/abs/nlin/0212031v1

Nonlinear Sciences

Pattern Formation and Solitons

a latex text file and 11 jpg files with figures; an extended version of the paper will appear in Journal of the Optical Societ

Scientific paper

10.1364/JOSAB.20.000725

We study the interactions of a Bragg-grating soliton with a localized attractive defect which is a combined perturbation of the grating and refractive index. A family of exact analytical solutions for solitons trapped by the delta-like defect is found. Direct simulations demonstrate that, up to the numerical accuracy available, the trapped soliton is stable at a single value of its intrinsic parameter ("mass"). Trapped solitons with larger mass relax to the stable one through the emission of radiation, while the solitons with smaller mass decay. Depending on values of parameters, simulations of collisions between moving solitons and the defect show that the soliton can get captured, pass through, or even bounce from the defect. If the defect is strong and the soliton is heavy enough, it may split, as a result of the collision, into three fragments: trapped, transmitted, and reflected ones.

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