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The fourth-order dispersion coefficient of fibers are estimated by the iterations around the third-order dispersion and the high-order nonlinear items in the nonlinear Schordinger equation solved by Green's function approach. Our theoretical evaluation demonstrates that the fourth-order dispersion coefficient slightly varies with distance. The fibers also record β4 values of about 0.002, 0.003, and 0.00032 ps 4 /km for SMF, NZDSF and DCF, respectively. In the zero-dispersion regime, thedoi:10.3788/col201210.101903 fatcat:wtbe6bs4r5aend67mvrs7l552q