What do the fiber terms 9/125, 50/125 and 62.5/125 refer to? They refer to the diameter of the core and cladding. The first set of numbers - 9, 50 and 62.5 refer to the diameter of the core. The second set of numbers - 125 refer to the diameter of the outside of the cladding. Cladding keeps light from escaping the glass core. 9/125 refers to singlemode. 50/125 and 62.5/125 refer to multimode. View a Fiber Optic Tutorial explaining terms, optical transmission and commonly used fiber optic connectors. View a Fiber Optic Tutorial explaining how to select the right type of Fiber Optic cable, bandwidth and application differences between copper and fiber optic cabling, and polish types and typical back reflection. View L-com's complete offering of Fiber Optic cables, adapters and more.
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