Propagation of short different-wavelength optical pulses in many-level absorbers is studied. New analytic solutions to the appropriate Maxwell-Bloch equations having the form of simultaneous different-wavelength optical solitons, so called simulton solutions, have been found. In order for simulton propagation to occur, both the pulses and the medium have to be initially prepared in a manner determined by the medium's physical parameters. The analytic findings are extended with the use of numerical modelling. © 1981.
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