Fiber-optic pigtails are used to connect fiber-optic cables using fusion or mechanical splicing. Unlike a patch cord—which has connectors on both ends—the bare fiber end of a pigtail is designed to be permanently spliced (either by fusion or. A fiber optic pigtail is a type of fiber optic cable with only one end that has a factory-terminated connector and the other end exposed as bare fiber. Available in a range of multimode and single-mode fibers with SC, ST or LC connectors. Pre-routed and preloaded, pigtailed splice cassettes reduce installation time by up to 40%.