The propagation of solitons in materials with saturable nonlinearity has been investigated with numerical and analytical methods. It is demonstrated that bistable (or two-state) solitons exist that describe pulses with the same duration but different peak powers. It is proved that both solution branches are stable. The minimum possible pulse duration of a fundamental soliton depending on the saturation parameter has been predicted. The influence of loss and the evolution of high-order solitons are studied.
© 1991 Optical Society of America
Original Manuscript: September 21, 1990
Revised Manuscript: April 29, 1991
Published: November 1, 1991
S. Gatz and J. Herrmann, "Soliton propagation in materials with saturable nonlinearity," J. Opt. Soc. Am. B 8, 2296-2302 (1991)