ABSTRACT -- The study of nonlinear Schrodinger equation is used to describe the propagation of optical signals in single mode optical fiber that is represented a model of transmission light pulse signals in an optical fiber. Basic soliton equation is briefly reviewed for the explanation of signals group velocity dispersion (GVD) and self-phase modulation (SPM) which effect the required optical transmission signals. The modeling of soliton pulses travelling into two or three coupling fibers are modeled then input into the soliton wave equations. The input optical signal parameters such as light pulse width, input signal bit rate, light source wavelength and bandwidth, and coupling power are employed in the soliton equation. The coupling output signals obtained are described for the use in optical transmission devices such as optical filter, switching and multiplexer. The physical behaviors of the optical output signals obtained by numerical technique are associated with the optical device parameters.
Keywords -- Optical Communication , Optical Devices.