Wireless optical feeder system with optical power supply
Nobuo Nakajima, Naohiro Yokota · 2008
Base stations of the cellular system increase according to the increase of subscribers and transmission bit rate. Most of the places suitable for the base station were occupied by the existing systems. Therefore, sometimes, new base station must be installed at the places where power supply or transmission cable is not available. The proposed feeder system is applicable for such case. The RF signals are fed to the repeater through the air by optical beams. And electrical power is fed by the optical beam, too. This paper describes the design principle and experimental results of the proposed system. By using 4 cm diameter optical beams for RF transmission and 26cm diameter beam for power transmission, available forward link RF power at the repeater station is 10mW in the case that the distance between the base station and the repeater station is 40 m. If 48 cm diameter reflector is used for power transmission, 100 mW RF power will be available for the forward link.