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Multimode fiber is an optical fiber that is designed to carry multiple light modes, each at a slightly different reflection angle within the optical fiber core. Multimode fiber gives you high bandwidth at high speeds over short to medium distances. Light waves are dispersed into numerous paths, or modes, as they travel through the cable's core typically at 850 or 1300nm. Typical multimode fiber core diameters are 50, 62.5, 100um. As the number of light reflections passing through the core increases, this leads to high dispersion and attenuation rate and eventually the quality of the signal is reduced over long distances. Multimode fibers are typically used for short distances, e.g. for audio/video applications in LANs. RF broadband signals, which cable companies commonly use, cannot be transmitted over multimode fibers.