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Étude des potentialités offertes par les technologies de transmission optique flexible pour les réseaux métro / coeur

Sofiene Blouza 1
1 ATNET - Advanced Technolgy in Networking
IRISA-D2 - RÉSEAUX, TÉLÉCOMMUNICATION ET SERVICES
Abstract : The evolution of new telecommunication services, which requires large bandwidth, challenges bit-rates transported by each optical channel of a WDM network. Bit-rates of optical channels have now reached 100 Gbit/s. This increase in bit-rate must be supported by new features in optical network. Improve flexibility and ensure transparency of optical network, are very important challenges that telecom operators face today. An optical network is called transparent, if the transported optical signals are not converted in electrical domain except at the time of their insertion and extraction in/from the optical network. Flexibility concerns mainly the aggregation / disaggregation processes. Today, the functions of aggregation/disaggregation are made on the electrical domain. This generates a significant cost for operators. One way to avoid this would be to find a technology which offers high bit-rates and enable the aggregation and disaggregation functions in the optical domain. In this thesis, we propose to study all-optical switching technology at the sub-wavelength granularity. This technique, called multi-band OFDM, consists in dividing a WDM channel into multiple entities, called sub-bands. The number of sub-bands depends on the technological constraints of optical components used to transport the optical signal (optical filters, digital analogical converters, analogical digital converters, optical transponders, optical multiplexers, etc.). We compare the multi-band OFDM technology to two legacies scenarios: mono-band opaque and mono-band transparent WDM technologies. We demonstrate that the multi-band OFDM technology can be a trade-off between these two legacies scenarios. To do that, we studied the performance in terms of blocking ratio of the multi-band OFDM technology and mono-bands WDM technologies. We study the impact of increasing the number of sub-bands on network performances. We also investigate the technical limits of this technology. Moreover, we demonstrate the economic interest of the multi-band OFDM. We expose the gain on the number of transponders when the multi-band OFDM technology is deployed on metro and core network.
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Submitted on : Friday, October 4, 2013 - 5:57:08 PM
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Sofiene Blouza. Étude des potentialités offertes par les technologies de transmission optique flexible pour les réseaux métro / coeur. Autre [cs.OH]. Université Rennes 1, 2013. Français. ⟨NNT : 2013REN1S031⟩. ⟨tel-00870064⟩

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