Modulational instability in bulk periodic structures: numerical results

Summary form only given. Recently, modulational instability (MI) in periodic structures has attracted considerable attention. We study MI in a bulk nonlinear medium with a Bragg grating along the direction of propagation. In these structures, MI is caused by mutual interplay among dispersion, diffraction and nonlinear effects and results in spatial and temporal effects simultaneously. Light propagation in bulk periodic structures is modeled by a set of nonlinear coupled-mode equations written in the paraxial approximation.