It is used to connect optical fiber or optical fiber butt pigtail, which is equivalent to making a joint (fiber butt pigtail refers to the butt joint of the fiber core of the optical fiber and the pigtail instead of the pigtail head mentioned in the former), and is. It is used to connect optical fiber or optical fiber butt pigtail, which is equivalent to making a joint (fiber butt pigtail refers to the butt joint of the fiber core of the optical fiber and the pigtail instead of the pigtail head mentioned in the former), and is. A fiber optic pigtail is a short length of optical fiber cable with a factory-terminated connector on one end and a bare, exposed fiber on the other. Unlike a patch cord—which has connectors on both ends—the bare fiber end of a pigtail is designed to be permanently spliced (either by fusion or. Fiber cold splicing and fiber splicing 1. The wires in question are connected manually (people have different methods, many twist the wires around each other like a “lineman's splice”), and solder is heated with a soldering iron until. A UY Connector or a UR Connector is a "U" style, end-to-end butt splice connector commonly used in telecommunications and low-voltage electrical wiring. A UR or UY connector is typically made of metal or plastic with a colored housing and may have a gel-filled interior to provide additional. The most efficient way to terminate a fiber run is by using a pigtail. 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. Instead of building a connector from.