SOLITON WITH GAUSSIAN TAILS AS A CARRIER PULSE IN OPTICAL COMMUNICATION-SYSTEMS WITH IN-LINE PHASE MODULATORS

We suggest to use a soliton with Gaussian tails as an information carr ier in optical transmission systems with in-line phase modulators. An average (distributed) effect of the in-line phase modulation manifests itself in the creation of the effective parabolic potential that can be of trapping or nontrapping type. In the case of a trapping potentia l, a steady-state pulse is an intermediate state between a sech-type s oliton of the nonlinear Schrodinger equation (NLSE) and the Gaussian p ulse. Properties of such a soliton have been examined. The same carrie r pulse with Gaussian tails can be formed in fibre dispersion-managed systems using an additional grating. A non-trapping potential leads to the occurrence of oscillating tails resembling the structure of the b reathing soliton in optical transmission systems with strong dispersio n management. (C) 1998 Elsevier Science B.V.