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. Understanding what pigtail connectors are, how they function, and where they are used can help both professionals and enthusiasts optimize their. In fiber optics, pigtails are fusion-spliced to field fiber inside splice trays — the most common termination method in telecom and data center networks. Common fiber pigtail types include LC, SC, ST, and FC, available. A pigtail connector is a short, pre-terminated length of cable with one end connected to a connector and the other end left open or spliced into another assembly.