This method involves connecting the circuit's main wires to a short jumper wire, or pigtail, which then connects to the terminal of the device. It acts as a jumper between the device terminal and the spliced bundle of circuit wires. This technique ensures the device is. A pigtail is a simple wiring technique used when installing electrical outlets, switches, or other devices inside a junction box. Fiber Optics (The Industry Concept) “Fiber optics” refers to the entire field of optical communication technology that uses light to transmit data. It is not a product, but a technology domain covering: In. Optical fiber jumper, also known as optical fiber connector, means that both ends of the optical cable are equipped with connector plugs to realize the active connection of the optical path.