Multimode fiber

Optical-fiber cable whose core is between 8 and 200 microns with a refractive index that is graded or stepped; multimode fiber has a core diameter large enough to allow light to take more than one possible path through it. It allows the use of inexpensive LED light sources, and connector alignment and coupling is less critical than with single-mode fiber. Distances of transmission and transmission bandwidth are less than with singlemode fiber due to dispersion. The ANSI/TIA/EIA-568-B standard recognizes the use of 62.5/125-micron and 50/125-micron multimode fiber for horizontal cabling.