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Graded-index fiber
In 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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