PROPAGATION AND STABILITY OF THE STATIONARY STRIPE NONLINEAR GUIDED-WAVES IN A SYMMETRICAL STRUCTURE WITH A NONLINEAR FILM

The propagation and stability of the stationary stripe nonlinear guide d waves in an 'antiwaveguide' symmetric layered structure containing a nonlinear film are simulated numerically. The symmetric, antisymmetri c and asymmetric modes are considered, in both Kerr-law and saturable instantaneous self-focusing nonlinearity cases. The numerical calculat ions support the statement that stationary stripe nonlinear guided wav es are always unstable on propagation for Kerr-law nonlinearities and the use of saturable nonlinear films leads to stability on propagation for effective indices corresponding to the ascending branches of the nonlinear dispersion curves.