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. 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, also known as pigtailed fibers, consist of an optical fiber connector and a section of optical cable. In such contemporary fiber optic communication systems, low-loss, and connectivities, which have reliability, are crucial for not only maintaining high-speed but also high-quality data transmission.