Fiber architecture solutions for providing wireless network coverage by radio-over fiber feeding in buildings
are discussed. The focus is on very high wireless data rate applications (>>100 Mb/s) with short wireless
distances (typ. <10m). Up to 20 Gb/s signal transmission at 60 GHz is demonstrated.
Proc. SPIE. 7632, Optical Transmission Systems, Switching, and Subsystems VII
KEYWORDS: Signal to noise ratio, Modulation, Radio over Fiber, Single mode fibers, Modulators, Telecommunications, Antennas, Signal generators, Wireless communications, Orthogonal frequency division multiplexing
The paper discusses the challenges of using radio-over-fiber systems to distribute multi-gigabit-per-second wireless
signals at mm-wave frequencies. We propose possible solutions to the challenges, and demonstrate the potential of
simple radio-over-fiber system architectures to support
multi-standard wireless communication at data speeds exceeding
14Gbps using the 60 GHz band.
The European MUSE project, which aims to enable "MUlti Service and access Everywhere", studies architectures, technologies and business scenarios facilitating the deployment of new Broadband Access Networks and Services. This paper gives an overview and particularly discusses results of some of the high-speed access technologies that are developed.
Using a novel optical frequency multiplication technique, microwave signal carriers up to 20-GHz are delivered to a significantly simplified remote radio access unit fed by a multimode fibre link having modal bandwidth below 1-GHz, as well as standard single mode fibre. Measurement results show that the remotely generated carriers have very narrow linewidths below 20-Hz, and exhibit much lower phase noise (< -90 dBc/Hz) than even a commercially available high frequency electronic signal generator. Thus by using optical frequency multiplication, 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 (and for short links), signals of present WLANs as well as future broadband WLAN services leading to significant system-wide cost reduction. It also enables the radio signal processing to be consolidated in a single central site, which is beneficial for advanced signal processing such as needed in multiple-input multiple output (MIMO) systems.