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Graded-index fiberIn telecommunication, a graded-index fiber is an optical fiber with a core having a refractive index that decreases with increasing radial distance from the fiber axis.Note: The most common refractive index profile for a graded-index fiber is very nearly parabolic. The parabolic profile results in continual refocusing of the rays in the core, and compensates for multimode distortion. Source: from Federal Standard 1037C and from MIL-STD-188 
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Graded-index fiber".