Photonic communications is the basis for the global telecommunication infrastructure serving the demands for data-connectivity of the Internet age. Access to the Internet and in general to information and communication technology (ICT) platforms, anytime, anywhere and by anyone has become fundamental for knowledge intensive economies and for information-based societies.
Conception and design of the link suitable for transmission of different applications on mm-wave frequencies, e.g. 60 GHz, in hybrid fiber-wireless channel.
The project investigates the interaction of high quality high demand visual applications in a communication perspective. We are building set-ups for home networks with a combination of optical fiber transmission and wireless transmission for the delivery of high quality video applications. Delivery of compressed as well as uncompressed HD video is considered. We study in-home networks as well as delivery across metro-core network. For home networks communication from a home erver to e.g. displays anywhere in the house must be supported. We explore the flexibility of the optical-wireless network transmission employing different types of applications, investigate their error-resilience features and investigate the ways to make the system more energy efficient. One of the objectives is to explore how the hybrid fiber-wireless channel will affect video transmission e. g. problems of high losses, directivity and blockage in none-line-of-sight case.
Optical heterodyne up-converesion of baseband multi-level format signal into high frequency band (W-band, 300 GHz band), establish the wireless link with high directive and high gain antennas and demodulation with DSP processing.
This PhD project explores options to achieve high capacity hybrid optical fiber-wireless transmission in the access networks. We want to investigate different ways of generating high frequency RF signals in W-band and 300 GHz band, where broader unlicensed bandwidth are available for communication, by using both electrical and photonic methods. Transparent up-conversion of high speed optical baseband signal into high frequency RF domain can realize the seamless convergence of optical fiber system and wireless transmission. With the help of DSP processing, multi-level signal formats are adopted to maximize the spectral efficiency within the available RF bandwidth, which in turn increase the overall throughput of the system. This system has the potential to realize the next generation of user-centered networking, where users can ubiquitously access services and applications enabled by seamless broadband wireless-fiber connections.
Integrating multiple antennas, multiple input multiple output (MIMO) with optical code division multiple access (OCDMA) in RoF networks.
This PhD project deals with advanced multiplexing techniques for radio-over-fiber in access networks. We want to investigate the use of optical CDMA for radio over fiber as a way to simplify the overall physical layer of a hybrid optical-wireless access network. For wireless communication MIMO technology has attracted attention because it offers significant increases in data throughput and link range without additional bandwidth or transmit power. It achieves this by higher spectral efficiency (more bits per second per hertz of bandwidth) and link reliability or diversity (reduced fading). This new concept aims at improving future telecommunication technology at physical layer infrastructure.