Coherent interaction effects in pulses propagating through a doped nonlinear dispersive medium.

Using a numerical approach we report on the cloning dynamics of simultaneous self-induced transparency ~SIT! and nonlinear Schrodinger ~NLS! solitons in a doped nonlinear dispersive medium. This technique involves a three-level atomic system interacting resonantly with two optical fields within a L scheme. As a result, a pulse in the signal frequency is transformed into a replica of the pulse in the pump frequency. The atomic population evolution shows that the basic mechanism behind the cloning process is the coherent population trapping effect. Furthermore, it is shown that the signal clone presents characteristics of both the SIT soliton and NLS soliton.