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Multi-Mode. Multimode cable is made of glass fibers, with common diameters in the 50-to-100 micron range for the light carry component (the most common size is 62.5). POF is a newer plastic-based cable which promises performance similar to glass cable on very short runs, but at a lower cost.ultimode cable is made of glass fibers, with common diameters in the 50-to-100 micron range for the light carry component (the most common size is 62.5). POF is a newer plastic-based cable which promises performance similar to glass cable on very short runs, but at a lower cost.
The two types of fiber are multimode and singlemode. Within these categories, fibers are identified by their core composition (MM step-index or graded-index) and core/cladding diameters expressed in microns (one millionth of a meter), e.g. 50/125 graded-index micron multimode fiber.he core is designed to have a higher index of refraction, an optical parameter that is a measure of the speed of light in the material, than the cladding, which causes total internal reflection to trap light in the core up to a certain angle, which defines the ânumerical apertureâ of the fiber.