Using multimode fibres for broadband indoor wireless coverage

Using a novel optical frequency multiplication technique, microwave signal carriers exceeding 20-GHz are delivered to a significantly simplified remote radio access unit fed by a multimode fibre link having modal bandwidth below 2-GHz. Measurement results show that the remotely generated carriers have very narrow linewidths below 20-Hz. Thus existing in-building silica multimode fibre infrastructure, and the emerging polymer optical fibres may be used to not only transport fixed data services such as gigabit Ethernet but also to transparently distribute in-doors, signals of present WLANs as well as future broadband WLAN services leading to significant system-wide cost reduction