Dispersion-managed solitons in optical fibres

The variational principle is employed to study chirped solitons that propagate through optical fibres and is governed by the dispersion-managed nonlinear Schrodinger's equation. In this paper, we have considered both kinds of fibres, namely polarization preserving and birefringent types. The study is extended to obtain the adiabatic evolution of the parameters of such solitons in the presence of perturbation terms for both types of fibres.