Provided is an optical backplane interconnect system, one embodiment of which features transceiver subsystems employing holographic optical elements (HOEs) that define, and discriminate between, differing optical channels of communication. The HOEs employ a holograph transform to concurrently refract...http://www.google.com.hk/patents/US6452700?utm_source=gb-gplus-share專利 US6452700 - Computer backplane employing free space optical interconnect
