Effect of frequency Chirp on the Black and Gray Solitons Propagation in Optical Fiber

The behavior of the first-order black and gray solilons propagated in optical fiber in the presence of frequency chirp is studied analytically and numerically. Results show that phase profile of black solitons changes abruptly by (@=) whereas for gray solitons phase profiles change more gradual and smaller than a. Black solitons characterized by the intensity at the dip falls to zero while for gray solitons the dip does not extend all the way to zero. Results indicate that the solitons pulses shifi surther from the axes of the link patlı designed as the value of darkness parameter (B) decreases. As a consequence of the frequency chirp the channel capacity performance of an optical communication link is reduced. Numerical study shows a good agreement with the analytical results.