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In this study, the generalized nonlinear Schrödinger equation describing nonlinear wave propagation in optical fiber with all higher order effects such as higher order dispersion, self-phase modulation and Raman scattering is considered. Using the numerical method, the effects of the terms third order dispersion, Raman scattering on evolution of ultrashort pulses are investigated in detail. | Effects of raman scattering and third order dispersion on soliton propagation in optical fiber