These materials resist heat, deformation, and repeated mating cycles. A fiber optic pigtail is a short length of optical fiber —typically 0. 5m to 2m—that has a factory-terminated connector on one end and bare fiber on the other end. Bunch and color-coded types are available. 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. Bundle pigtail: This kind of pigtail is also called pigtail bundle, which is composed of Corning tight-sleeved optical fiber, aramid fiber strengthening element and flame-retardant PVC protective sheath.