Abstract
Optical solitons arise as self-trapped transverse spatial profiles in nonlinear planar waveguides or as temporal pulse shapes in fibres. The interesting property of these propagating wave packets is not only their space-invariant or time-invariant profiles, but also their robustness to external perturbations. Spatial and temporal solitons have been observed in different experiments, opening the way to realise, thanks to their interesting properties! 1], all-optical devices [2,3], Soliton propagation through nonlinear interfaces, that is in condition of strong perturbation, has already been studied[4,5]. In this paper we want to study the propagation of a soliton beam in a waveguide with a Gaussian refractive index profile, where the initial position of the maximum intensity of soliton is shifted with respect to the position of the maximum of the index profile. In this situation the beam is attracted towards the center of the index profile, acquiring a certain velocity that allows it to pass this point and to continue to move forward to the other side of the index profile decreasing its velocity. The situation is very similar to the trajectory of a mass in a gravitational potential hole.
© 1996 Optical Society of America
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