Tesis doctoral de Josep María FÁ brega Sánchez
Nowadays, when talking about access networks, advanced multimedia applications are changing customer demands, requiring much higher speed connection. Thus, other alternatives to deployed time division multiplex passive optical networks (tdm-pons) are appearing to increase available bandwidth. Wavelength division multiplex provides virtual point-to-point connections, so multiplies the effective bandwidth that the fiber can offer. A significant step forward is ultra-dense wdm (ud-wdm), where wavelengths are separated by just a few ghz, increasing the number of channels that can be accommodated on a single fiber. Following this line, if narrow channel-spacing could be achieved, a new philosophy of wavelength-to-the-user (ttu) can be envisaged, multiplying the number of connections as well as maintaining high data rates. one of the enabling technologies for such challenge can be coherent transmission and reception systems. First of all because they allow the use of improved modulation formats (like phase shift keying – psk), extending the reach of the networks. Secondly, since they use electrical filtering for channel selection, narrow channel spacing can be achieved while maintaining high speed connection. The most promising technology for achieving these performances is homodyne reception. several novel transceiver architectures, based in homodyne reception, are proposed and experimentally evaluated in this work. The most robust and simple of the considered architectures has been fully developed and prototyped in order to be used in a network test-bed. For that prototype, transmission experiments demonstrate a sensitivity of -38.7 dbm sensitivity at 1 gbps, while featuring a power budget of 47 db. furthermore, we propose different pon architectures specifically designed for the proposed transceivers. With the experimental prototype previously developed, we obtain a network deployment capable to serve up to 1280 users at maximum distance of 27 km and featuring a maintained data rate of 1 gbps per user. coherent transceivers are potential candidates for the next generation pons, as they allow the multiplication of the number of users to serve while maintaining high data rates. However, it is still necessary to deal with transceiver costs, mainly on the local laser needed.
Datos académicos de la tesis doctoral «Homodyne olt-onu design for access optical networks«
- Título de la tesis: Homodyne olt-onu design for access optical networks
- Autor: Josep María FÁ brega Sánchez
- Universidad: Politécnica de catalunya
- Fecha de lectura de la tesis: 17/05/2010
Dirección y tribunal
- Director de la tesis
- Josep Joan Prat GomÁ
- Tribunal
- Presidente del tribunal: jaume Comellas colome
- marco Forzati (vocal)
- valter Ferrero (vocal)
- ronald Freund (vocal)