Multimode optical fiber is sometimes called mm fiber or MMF, it is generally used in short distance fiber optic communications. Usually we use two types of multimode fiber, the 50/125 and 62.5/125 types. Multimode fiber cables are usually with orange color to identify them easily. Generally speaking, multimode fiber cables are more expensive than single mode types, if they are same length and structure.
The 62.5/125 multimode fiber is sometimes called OM1 fiber, common 50/125 multimode fiber is named OM2, while there do exist the OM3 fiber, it refers to another kind of 50/125 mm fiber which suit for 10gig network applications. All these multimode fiber cables can be with various kinds of terminated connectors and cable length. Even the jacket color can be custom made. (Although there is industry practice to use specified color to identify them).
Standards for multimode fiber are specified by TIA (Telecommunications Industry Association) and EIA (Electronic Industries Association) in the U.S.A. Similar standards had also been developed in Europe. Huihong Technologies Limited mm fiber cable assemblies follow the U.S.A standards.