Dispersion-managed solitons in a periodically and randomly inhomogeneous birefringent optical fiber

The propagation of dispersion-managed vector solitons in optical fibers wit h periodic and random birefringence is studied. With the help of a variatio nal approach, the equations that describe the evolution of pulse parameters are derived. Numerical modeling is performed for variational equations and for fully coupled periodic and stochastic nonlinear Schrodinger equations. It is shown that variational equations can be effectively used to describe the averaged dynamics of dispersion-managed vector solitons with stochasti c perturbations. It is shown, analytically and numerically, that dispersion -managed (DM) solitons have the same resistance to random birefringence as do ordinary solitons. The dependence of the mean decay length of a DM vecto r soliton on the strength of random birefringence and on the energy of the initial pulse is found. (C) 2000 Optical Society of America [S0740-3224(00) 00606-8].