Etude des architectures optiques pour le réseau local domestique, basées sur la fibre multimode (polymère et silice) et le multiplexage en longueur d’onde

Abstract : Only optical fiber is able to meet capacity and heterogeneity requirements of the future home network. Plastic or silica multimode fiber would be preferred for lower system costs. Two main multiformat architectures have been identified, based on an active or a passive star. Silica multimode fiber is suitable for an active star but plastic fiber could also be eligible, with its very low cost. Unfortunately, its bandwidth is far too limited. Solutions to increase its capacity, such as wavelength multiplexing, have to be investigated. In a first step, the active star is an efficient solution bringing performances and simplicity. It will be probably replaced later by a passive star combined with wavelength multiplexing, which will provide huge capacity and flexibility. This solution has been demonstrated with singlemode fiber but cost issues could lead to the use of multimode fiber, for which no specific CWDM (Coarse Wavelength Division Multiplexing) components are today available. These two issues are addressed in this thesis. Investigations are first conducted on WDM in plastic fiber, leading to admit that the state of the art does not allow significant steps in this direction. We then focused on the use of silica multimode fiber in a CWDM passive star. After experimental works, problems have been raised showing a poor uniformity of the N×N coupler when using usual CWDM sources. An original time-effective method has been proposed, based on both simulation and matrix calculation. Provided results give a better understanding of the behavior of the N×N coupler with different types of sources, taking also into account improvement techniques as offset launching or mode scrambling.
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Francis Richard. Etude des architectures optiques pour le réseau local domestique, basées sur la fibre multimode (polymère et silice) et le multiplexage en longueur d’onde. Electronique. UNIVERSITE DE NANTES, 2012. Français. ⟨tel-01108312⟩

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