Optical fiber cables contain one or more optical fibers made of glass, that transfers digital data signals in the form of light. The optical fibers are coated with an outer jacket, that is made of a strong and flexible material, usually polyurethane or PVC, along with a Kevlar protection. There are 2 types of optical fiber cables, Single Mode Fiber Cable (SMF) and Multimode Fiber Cable (MMF). Single Mode carries higher bandwidth than multimode fiber and so it is advisable for bigger distances. Multimode gives you high bandwidth at high speeds, but works better at medium or short distances.