Abstract

The concept of non-linear pulse is a symptom of such physical phenomenon inherently non linear, and its history is intimately linked to the development of theories of equations of nonlinear waves. As such, we now know that the non-linear pulses occur naturally in most nonlinear systems. This paper is devoted to modeling the evolution of nonlinear pulse during its propagation in a nonlinear directional coupler (NLDC) in terms of intermodal dispersion (IMD) in order to show the impact of these phenomena on the propagation in the (NLDC). In this case modeling the propagation in a nonlinear medium is governed by a system of coupled nonlinear Schrödinger equations (CNLSE). This is a mathematical model using to describe the (NDLC). The study is focused on the propagation of fundamental solitary pulses.  

Key words: Nonlinear optic, dispersive medium, nonlinear medium, modeling, temporal widening, optical coupler, nonlinear pulses, nonlinear fiber, coupled nonlinear Schrödinger equation (CNLSE), intermodal dispersion (IMD).