Incoherently coupled spatial soliton families in centrosymmetric photorefractive crystals

To study the incoherently coupled spatial soliton families in centrosymmetric photorefractive crystals, we derived theoretically the expressions of normalized spatial profiles of the bright, dark and bright-dark soliton families from the soliton theory in centrosymmetric photorefractive crystals and investigated the characteristics of the soliton families. The numerical results show that these soliton families are coupled by the mutually incoherent incident optical beams sharing the same polarization and wavelength. When the incoherent coupled soliton families propagate in centrosymmetric photorefractive crystals, all the components propagate stably. Moreover, the soliton families degenerate to incoherently coupled dark-dark, bright-bright and bright-dark soliton pairs when they contain only two components.