The Fiber Optic Repeater transmits signals through fiber optic cable. It is suitable for long-distance transmission due to its low transmission loss. It can solve the signal coverage of villages, towns, tourist areas, highways, etc. that cannot receive base station signals, as well as can solve the signal coverage in large and super large buildings, used for high requirements of large high-rise regional buildings, residential areas and other occasions. They comprise of master unit and remote unit, antennas, passive components, fiber optic cable assemblies, and RF coaxial cables and jumpers.  The master unit captures the base stations signal via direct coupler close to base stations, then converts it into optic signal and transmits the amplified signal to the RU via fiber optic cable.  The remote unit will reconvert the optic signal into RF signal and provide the signal to the areas where network coverage is inadequate. And the mobile signal is also amplified and retransmitted to the base stations via the opposite direction. It is suitable for both cellular network and critical communication network such as TETRA/IDEN/PMR.