Abstract
The slow group-velocity femtosecond autosolitons in a dispersion flattened fiber are investigated, in which there is no third-order dispersion and there is no fourth-order dispersion. When the femtosecond pulse velocity is reduced to 50% of the normal group velocity, the analytical solutions of the bright and dark solitons are found. The magnitude of the fourth-order dispersion parameter is related to the high-order nonlinearity coefficient. The peak power and period of the solitons are determined by the magnitude of the fourth-order dispersion parameter and high-order nonlinearity coefficient.
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