Abstract
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<sup>4</sup>/km for SMF, NZDSF and DCF, respectively. In the
zero-dispersion regime, the high-order nonlinear effect (higher than
self-steepening) has a strong impact on the transmitted short pulse. This red-shifts
accelerates the symmetrical split of the pulse, although this effect is degraded
rapidly with the increase of β2. Thus, the contributions to β4 of SMF,
NZDSF, and DCF can be neglected.
© 2012 Chinese Optics Letters
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