Optics and Photonics Society of Iran

In this paper, we investigate the impact of chirp parameter on the pulse evolution in dispersion-engineered silicon nanowires by solving nonlinear Schrödinger equation (NLSE) using the split-step Fourier (SSF) method in MATLAB. By assuming femtosecond hyperbolic secant input pulse and including nonlinear effects, second- and third-order dispersion coefficients as a function of length the effect of chirp parameter on pulse propagation along nanowire, is investigated. The results show that the value and sign of the chirp has a significant impact on the pulse evolution and specially the pulse broadening along the nanowire so that the broadening can be reduced by adding a positive chirp to the input pulse. Hence, by choosing proper value of pulse parameters, pulse propagation can be controlled such that the minimum broadening during propagation happens