Criterion and Regions of Stability for Quasi-Equidistant Soliton Trains

Details Criterion and Regions of Stability for Quasi-Equidistant Soliton Trains Criterion and Regions of Stability for Quasi-Equidistant Soliton Trains

1997-08-14

arxiv.org/abs/solv-int/9708004v1

Nonlinear Sciences

Pattern Formation and Solitons

14 pages, LaTeX (revtex style), 5 figures

Scientific paper

Using the complex Toda chain (CTC) as a model for the propagation of the N-soliton pulse trains of the nonlinear Schrodinger (NLS) equation, we predict the asymptotic behavior of these trains. The following asymptotic regimes are stable: (i)~asymptotically free propagation of all N solitons; (ii)~bound state regime where the N solitons may move quasi-equidistantly (QED); and (iii)~various different combinations of (i) and (ii). For N=2 and 3 we determine analytically the set of initial soliton parameters corresponding to each of these regimes. We find excellent agreement between the solutions of CTC and NLS for all regimes and propose realistic choices for the sets of amplitudes, for which the solitons propagate QED to very large run lengths. This is of importance for optical fiber communication.

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