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Because the importance of the optical wave propagation in fibers, we seek for the optical travelling wave solutions and effect of the third-order dispersion parameter for the extended nonlinear Schrödinger equation (NLSE) which is used to describe the femtosecond(fs) pulse propagation in optical fiber. We have used the modified F-expansion method because it is effective, sufficient and offers more solutions for this kind of problems. First, we obtain the nonlinear ordinary differential form (NODE) by using the wave transformation on the investigated extended nonlinear Schrödinger equation. Then, we propose the modified F-expansion method to get solution of the equation as the NODE form, and by calculating the balancing constant over the NODE form. By substituting the proposed solution function and its derivatives in the NODE form, we obtain an algebraic equation system over this NODE. With the solution of …