Stable soliton transmission in the system with nonlinear gain

It is shown that the linear-wave growth in bandwidth-limited-amplified soliton transmission can be suppressed by a selective amplification of solitons by means of nonlinear gain that can be realized by using fast saturable absorbers. Numerical simulations assuming the use of nonlinear amplifying loop mirrors (NALM's) as the nonlinear-gain element show that 20 Gb/s soliton trains can be transmitted over transoceanic distances, Wavelength-division multiplexing is also feasible if demulti/multiplexers are used just before and after the NALM.>