FC-FC, commonly known as round-to-round pigtail. Generally used as fiber jumpers between ODF racks. FC connects to the ODF box, and SC connects to the optical port of the device. The bare fiber end. Executive Summary: A fiber optic pigtail is one of the most commonly specified yet least understood components in structured cabling. Get the wrong connector type, the wrong polish, or skip proper fusion splicing technique—and you're looking at elevated signal loss, increased back reflection, and a. A pigtail connector is a short cable with a connector on one end and bare (stripped) wire or fiber on the other. In electrical work, pigtails. Pigtail, also known as pigtail, has only one end with a connector, and the other end is a broken end of a fiber optic cable core.