An analytical solution is obtained for solitary pulse propagation in an amplified nonlinear dispersive system. For a homogeneously broadened gain medium, this solitary pulse has a hyperbolic secant amplitude and a hyperbolic tangent instantaneous frequency variation. The pulse is a gain-guided pulse in either the positive or the negative dispersion regime as well as in the self-focusing or self-defocusing regime. A dark solitary pulse that has a hyperbolic tangent amplitude and a similar instantaneous frequency variation is also obtained.
© 1989 Optical Society of America
P. A. Bélanger, L. Gagnon, and C. Paré, "Solitary pulses in an amplified nonlinear dispersive medium," Opt. Lett. 14, 943-945 (1989)