step-index fiber


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step-index fiber

A multimode or singlemode optical fiber with a uniform refractive index throughout the core. The step is the shift between the core and the cladding, which has a lower refractive index. See graded-index fiber, dispersion-shifted fiber and dispersion.
References in periodicals archive ?
A simple inspection over the integral in (8) shows that the inner product between two general modes vanishes only when [u.sub.li] and [u.sub.lj] are the roots of the Bessel function [J.sub.v] (r) with r [member of] [0, a], which is not the case for the step-index fibers because [u.sub.li] and [u.sub.lj] are determined by the boundary conditions at the core-cladding interface and in general, they do not coincide with a root of the Bessel function [12].
This agrees with the results shown in Figure 5(c) when for a step-index fiber sufficiently good approximations of the dispersion values can be obtained even for N as small as 4.
Singh II, "Modal characteristic equation and dispersion curves for an elliptical step-index fiber with a conducting helical winding on the core-cladding boundary--an analytical study," Journal of Lightwave Technology, vol.