关键词: 导波与纤维光学, 保形传输条件, 归一化二阶色散系数, 龙格-库塔算法

Abstract:

By using Runge-kutta algorithm，calculates the differential equations that describe the evolution of super-gaussian pulse in optical fibers. The numerical result indicates that the width of the pulse and the chirp of frequency are oscillating with the increasing of the distance if normalized coefficient of the second-order dispersion is appropriate and initial chirp is small enough, and increasing jitter of frequency and phase resulted in the increase of distance. Obtained the normalized coefficient of the second-order dispersion and the initial chirp (＜10-4) that can guarantee conformal transmission of the pulse under the circumstance of given set of values of the factor (≤7) of the sharpness of super-gaussian pulse. The important parameters of super-gaussian pulse deviating widely from initial values in the process of the transmission in optical fibers if the coefficient of the second-order dispersion is too big or too small or initial chirp is too big.

Key words: waveguide and fiber optics, condition of conformal transmission, normalized coefficient of the second-order dispersion, Runge-kutta algorithm