Incoherently Coupled Soliton Families in Media with Generalized Nonlinearity

A generalized theory is presented for incoherently coupled spatial soliton families, which shows that the forming condition of these soliton families is directly dependent on the relationship between the index perturbation and the intensity, other than the sign of the index perturbation. Using this theory, we predict for the first time, to our knowledge, that besides bright, dark and gray ones, a novel type of incoherently coupled spatial soliton families, named anti-dark soliton families, can also exist in cubic-quintic nonlinear media.