A fiber identifier is an essential tool for optical fiber networks because it lets technicians locate the right fiber without cutting or disconnecting, saving time and avoiding downtime and it works by clamping onto the fiber to detect light signals and shows if the fiber is carrying. A fiber identifier is an essential tool for optical fiber networks because it lets technicians locate the right fiber without cutting or disconnecting, saving time and avoiding downtime and it works by clamping onto the fiber to detect light signals and shows if the fiber is carrying. Fiber pigtails are simple in appearance, yet essential in function. They are the bridge between fiber optic cables in the field and the equipment or patch panels that manage them. By combining factory-installed connectors with spliced bare fiber, pigtails ensure that network installers can create. How to choose, deploy, and scale fiber optic pigtails in a world of FTTR, 800G/1. VSFF connectors (SN/CS/MDC) and MPO/MTP ribbon pigtails. 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.