Manakov solitons in centrosymmetric photorefractive crystals due to two-photon photorefractive effect

We present a theoretical study on incoherently coupled soliton pairs in two-photon centrosymmetric photorefractive crystals under steady-state conditions. It is shown that the bright–bright, dark–dark and bright–dark Manakov soliton pairs can be generated in two-photon centrosymmetric photorefractive crystals when the total intensity of two soliton components is much lower than the dark irradiance.