5mm diameter ferrule made of ceramic (zirconia), stainless alloy or plastic. Hence SC fiber pigtails are commonly seen in telecommunications, industry, medical and sensor fields. These patch cords are primarily used to connect fiber optic cables to fiber optic transceivers (couplers, jumpers, etc. Most. A Fiber Pigtail is a single, short, usually tight-buffered, optical fiber that has an optical connector pre-installed on one end and a length of exposed fiber at the other end. One. The FiberRunner 4x4 Channel can be used with fittings and brackets to design a routing system to separate, route, and protect fiber optic and high-performance copper cables.