Suppression of soliton instability by higher order nonlinearity in long haul optical communication systems

The results of the numerical simulation of the propagation characteristics of periodically amplified solitons in a long nonlinear fiber have been repo rted. The roles played by both Kerr and saturable nonlinearities have been examined. The possibility of occurrence of instability and loss of solitons are also explored. This instability is found to be sensitive to the initia l chirp, fiber loss rate and amplifier spacing. Symmetrical splitting of so litons is also reported. The inhibition of instability and splitting can be possible through saturable optical nonlinearity.