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Dynamics of solitons in optical fibres

Abstract A multiple-scale perturbation method is developed to study the optical solitons described by a perturbed nonlinear Schrödinger equation. We show that, by properly defining the phase of the soliton pulse, we can obtain corrections to the pulse where a standard soliton perturbation approach fails. A comparison is made with results obtained by other methods as well as with numerical simulations.