A visual check is often the first step when diagnosing a defective fiber pigtail. Any visible crack, deep scratch, or sharp bend on the fiber pigtail can weaken. Executive Summary: A fiber optic pigtail is one of the most commonly specified yet least understood components in structured cabling. By the end, you will have a comprehensive understanding of why pigtails deserve a place in every fiber deployment toolkit. What Is a. The Fiber Optic Pigtail is a foundational component in modern telecommunications, serving as the critical link for terminating fiber optic cables. This wikiHow article will teach you how to splice a cut fiber optic cable back together with a fiber optic stripper and cutter and a fiber optic crimper.