PROPOSAL OF DIRECT OPTICAL SWITCHING CDMA FOR CABLE-TO-THE-AIR SYSTEMAND ITS PERFORMANCE ANALYSIS

For Cable-To-The-Air network providing a seamless access network in bo th indoor and outdoor, direct optical switching CDMA scheme is newly p roposed to multiplex any types of radio signals. In two types of conne ction methods, optical switch connection and optical coupler connectio n systems, the received carrier-to-interference-plus-noise power ratio s are theoretically analyzed. It is clarified that in the optical swit ch connection connection system, by introducing the additional optical gain at each radio base station, the carrier-to-interference-plus-noi se power ratios for all radio base stations and the connected number o f radio base stations can be improved compared with the OC connection system.