Usually,one considers only the group velocity dispersion (GVD)- and self-phase modulation (SPM)-induced solitons in optic soliton communication while other higher order effects such as the third-order dispersion (TOD),self- steepening (SS),and stimulated Raman scattering are considered only perturbatively.In this paper,we study the existence of the TOD- and SS-induced soliton solutions.The existence conditions of the TOD- and SS-induced bright and dark solitons are quite different from those of the GVD- and SPM-induced solitons.