In telecommunications, a 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. These connectors can be a big help when you need to connect two wires, repair damage, or extend a. Pigtails act as bridges, allowing you to connect several wires to a single point without overloading connections. Why does this matter? Modern systems demand precision.