Numerical Solutions Aspect of Nonlinear Schrodinger Equation in Monomode Optical Fiber

This paper addressed to the problem of simulating the development of solitons pulses in monomode optical fiber. The first part of the research involves solitons generation using the numerical analysis methods named Split Step Fourier Method (SSFM) to solve the nonlinear Schrodinger (NLS) equation, and, the solitons represent the solution of this equation. According to the study, the first-order soliton pulse propagates without change its shape along the lossless optical fiber. Solitons could be useful as information carriers in optical fibers communications system for achieving high bit rates. The second part of the research is to study some of the solitons transmission limits: loss. To study the loss effect different power loss rates P
los
from (0.1 → 1.0) dB/km and dispersion length L
D
=10km is used. Results show that the amplitude of the soliton decays exponentially as the distance increases, while the width of the soliton increases (pulse spread out). Also, as a consequence of power loss rate increases, the propagation of soliton will decreases for distances less than the link path designed, it means the information lost before it reach the receiver.