Investigations for Nonlinear Propagation Characteristics of Chirped Super-Exponential Pulse in Optical Communication

Abstract

The results for nonlinear propagation characteristics for un-chirped and chirped super-exponential pulses are presented using single mode fiber (SMF). The fiber system was modeled using split-Step Fourier algorithm to solve nonlinear Schrodinger equation that includes the effects as loss, linear dispersion and nonlinear self-phase modulation. These results clearly show that the pulse with negatively induced chirp broadens more than un-chirped pulse, whereas for positively induced chirped pulse, first compression occurs and then the pulse experiences broadening. We have shown the recovery of the pulse at 20 mW at a distance of 270 km with the interesting findings that fiber degradation effects can be minimized, even at higher power with longer propagated distance, by introducing a suitable value of the positive chirp in the input pulse. The results for the effects of variation of steepness parameter and the width of the pulse on its broadening are also discussed. The outcomes show that pulse broadening goes on increasing by reducing the width of the initial pulse; however pulse is compressed more and more as the value of the steepness parameter increases. This quantitative analysis provides insight for having more pulse compression using super-exponential pulse.