Optical switching for dynamic distribution of wireless-over-fiber signals in active optical networks

Rodes López, Guillermo Arturo
Otín Acín, Aránzazu (dir.)

Universidad de Zaragoza, EINA, 2012
Ingeniería Electrónica y Comunicaciones department, Tecnología Electrónica area

Ingeniero Técnico Industrial (Esp. Electrónica Industrial)

Free keyword(s): optical access network ; active optical network ; optical switch ; radio-over-fiber signals
Tipo de Trabajo Académico: Proyecto Fin de Carrera
Notas: The ever growing demand of bandwidth by end users has put a lot of pressure on access networks. Access networks, mainly employing wireless technologies, are turning to optics to support such large bandwidth requirements. Depending on the requirements and features of the end users, optical access networks have evolved in different directions. In residential and urban environments, users demand fix connections with high capacity at low price. Passive optical networks (PON) have fulfilled these requirements and are the operators chosen technology. In business environments, in which quality assurance and security are key issues, active optical networks (AON) have found their niche, providing flexibility, adaptability and high throughput while supporting tight management systems. Vendors are now turning their eye to new markets where optics can be used effectively. Mobile backhaul is a target market, since mobile traffic is growing exponentially – new gadgets along with killing applications are fueling such growth. Baseband technologies can support mobile backhaul effectively at current rates. However, due to the location of new license-free available frequency bands and the development of radio-over-fiber (RoF) technologies – allowing generation, distribution and reception of micro- and millimeter wave band signals optically, migration towards wireless-over-fiber scenarios are likely. Furthermore, concerns on security and high mobility seem to indicate active solutions may be in favor of system designers, provided that cost and energy consumption are maintained within reasonable limits. In this thesis, an optical access network based on radio-over-fiber technologies was designed. An active optical switch based on active components (semiconductors optical amplifiers (SOAs)) was used as main building block; the rest of the network was designed according to the channel distribution over the optical spectra required by the optical switch. An experimental validation was conducted. The experiment consisted in the implementation of a four channel system operating on a worldwide interoperability for microwave access (WiMax) frequency band, and employing an orthogonal frequency-division multiplexing (OFDM) modulation at 625 Mbit/s per channel, transmission of the data over 20 km of optical fiber, and active switching in a one-by-sixteen active optical switch. The results show a negligible power penalty on each channel, for both the best and the worst case in terms of inter-channel crosstalk. The system meets the requirements for an AON for wireless-over-fiber for optical access networks (OAN).

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trabajos-academicos-universidad-zaragoza > centro > escuela-de-ingeniería-y-arquitectura
trabajos-academicos-universidad-zaragoza > proyectos-fin-carrera

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