The Fiber Optic Repeater (FOR) is designed to solve problems of weak mobile signal in the place that is far away from the Base Transceiver Station (BTS) and has fiber optic cable network underground. An optical communications repeater is used in a fiber-optic communications system to regenerate an optical signal. Fiber Optics, also called optical fibers, are microscopic strands of a glas layer with about the same diameter s human hair. If you need to convert Single Mode to Multimode, or extend a Multimode network, Fiber Optic Repeaters are the devices to use. Repeater in networking works as “ Signal Boosters ”.