Study & Simulation of Fiber Nonlinearities using Adaptive Step Size Method

Simulation of pulse propagation in fiber optics is carried out by solving nonlinear Schrodinger equation. Both dispersive and nonlinear effects have been catered. In order to get speedy and accurate results adaptive step size algorithm has been adopted. The results are checked and found in coherence with conventional numerical algorithm. The work was carried out keeping the pretext in front that an optical pulse while propagating in a fiber undergoes dispersive and nonlinear change of phase rotation. It is the SPM (single pulse propagation) and XPM effects due to some uncontrolled birefringence of the fiber. While this effect is disturbing, it can also be utilized for passive mode-locking of fiber lasers.