Factory terminated and tested for insertion loss, return loss and end face. Before using the fiber, you should strip tight buffered fiber optic pigtail with tri-hole fiber stripper. 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 pigtail is an important component commonly used in fiber optic networks. Another distinguishing feature. 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.