Pulse shape transformation upon reflection from Bragg resonators with asymmetric feedback

The transformation of the shape of pulses reflected by Bragg resonators with step-up and step-down perturbation types of period contrast under conditions than carrier frequency is in the vicinity of the resonance Bragg frequency have been considered. Integral and differential estimates of the delay time have been compared. The coefficients of skewness and kurtosis for the reflected pulses versus carrier frequency have been calculated within Bragg reflection band. The conditions for the appearance of negative mass center delay of the reflected pulses have been determined. The conditions of the anomalous values of the delay time have been generalized for the case of asymmetric feedback in Bragg resonators.