This may be due to poor fiber cutting, such as a tilted end face, burrs, or unclean end face. Excessive thickness or thinning. 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. The most efficient way to terminate a fiber run is by using a pigtail. A fiber pigtail is a short length of optical fiber that comes with a high-quality, factory-polished connector already installed on one end, leaving a length of exposed glass on the other. For procurement managers and engineers, understanding fiber pigtails is not only about knowing another product type, but. Every pigtail is end-faced and inspected under controlled factory conditions — delivering consistent optical quality that field termination cannot reliably match.