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Nonlinear Sciences > Pattern Formation and Solitons

arXiv:nlin/0204067 (nlin)
[Submitted on 27 Apr 2002]

Title:Spatial solitons in a medium composed of self-focusing and self-defocusing layers

Authors:Javid Atai (School of Electrical and Information Engineering, University of Sydney), Boris A. Malomed (Department of Interdisciplinary Studies, Faculty of Engineering, Tel Aviv University)
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Abstract: We introduce a model combining Kerr nonlinearity with a periodically changing sign ("nonlinearity management") and a Bragg grating (BG). The main result, obtained by means of systematic simulations, is presented in the form of a soliton's stability diagram on the parameter plane of the model; the diagram turns out to be a universal one, as it practically does not depend on the soliton's power. Moreover, simulations of the nonlinear Schroedinger (NLS) model subjected to the same "nonlinearity management" demonstrate that the same diagram determines the stability of the NLS solitons, unless they are very narrow. The stability region of very narrow NLS solitons is much smaller, and soliton splitting is readily observed in that case. The universal diagram shows that a minimum non-zero average value of the Kerr coefficient is necessary for the existence of stable solitons. Interactions between identical solitons with an initial phase difference between them are simulated too in the BG model, resulting in generation of stable moving solitons. A strong spontaneous symmetry breaking is observed in the case when in-phase solitons pass through each other due to attraction between them.
Comments: a latex text file and 9 eps files with figures. Physics Letters A, in press
Subjects: Pattern Formation and Solitons (nlin.PS)
Cite as: arXiv:nlin/0204067 [nlin.PS]
  (or arXiv:nlin/0204067v1 [nlin.PS] for this version)
  https://doi.org/10.48550/arXiv.nlin/0204067
Related DOI: https://doi.org/10.1016/S0375-9601%2802%2900473-5

Submission history

From: Boris Malomed [view email]
[v1] Sat, 27 Apr 2002 23:20:11 UTC (232 KB)
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