A two-component phase-modulated soliton in a medium with a two-photon resonant transition

A theory of optical self-induced transparency for a two-component phase-modulated soliton in a medium with a two-photon resonant transition has been developed. It is shown that a two-photon two-component soliton oscillating at the sum and difference frequencies in the vicinity of the carrier frequency can be formed under these conditions. Explicit analytical expressions are given for the form and parameters of non-linear wave under experimental conditions.