This unique design allows for a highly reliable and precise connection to be made through fusion or mechanical splicing. 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. Fiber optic pigtails are crucial in facilitating the termination of fiber optic cables, with their usage being a commonplace in optical fiber management systems, distribution boxes, and fiber terminal boxes.