Quadruply clad fiber
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In [[fiber optics]], a '''quadruply clad fiber''' is a [[single-mode optical fiber]] that has four claddings. Each [[cladding]] has a [[refractive index]] lower than that of the [[Fiber_optics#Principle_of_operation|core]]. With respect to one another, their relative refractive indices are, in order of distance from the core: lowest, highest, lower, higher.
A quadruply clad fiber has the advantage of very low macrobending losses. It also has two zero-[[dispersion (optics)|dispersion]] points, and moderately low dispersion over a wider [[wavelength]] range than a singly clad fiber or a [[doubly clad fiber]].
==References==
*[[Federal Standard 1037C]]
[[Category:Optical fiber]]