Abstract
In this paper we have studied the impact of the parabolic core index profile in highly nonlinear fiber design. Compared to the constant refractive index (RI) value of the core, different values of the parabolic function on the core index yield reasonable dispersion flatness in addition to the increased nonlinearity. A fiber with the parabolic core index exhibits optimum fiber properties such as zero dispersion wavelength (ZDW) of 1.5554 μm, dispersion slope of 0.02545 ps/nm2 km, and dispersion of −0.25 ps/nm km at 1.55 μm. In our analysis the parabolic core index also shows a good nonlinear coefficient of 8.71 W−1 km−1 and restricts the fiber to the fundamental linearly polarized (LP) mode (0,1) operations with a model index of 1.4591112.
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