Featuring a square-cut fiber end face, this pigtail provides superior alignment stability, minimal lateral displacement, and optimized coupling efficiency compared to standard angled or circular fiber end faces. Fiber pigtails are simple in appearance, yet essential in function. By combining factory-installed connectors with spliced bare fiber, pigtails ensure that network installers can create. A fiber optic pigtail is a short, usually unjacketed, optical fiber cable that has a factory-installed connector on one end and a length of exposed fiber at the other. It is usually suitable for field termination using a mechanical or fusion splicer.