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Etude et réalisation de liens optiques hétérogènes à base de semiconducteurs III-V reportés du Silicium

Fabien Mandorlo 1
1 INL - Photonique - INL - Nanophotonique
INL - Institut des Nanotechnologies de Lyon
Abstract : To follow the evolution imposed by Moore's law, digital circuits are becoming more and more parallelized with a large number of independent computational units. Optics may be used to provide them the necessary very high bandwidth, as traditional electrical links begin to suffer from their high consumption per transferred bit. In such cases, developing CMOS compatible optical interconnects can be necessary. If light transport around wavelength 1.55 μm is quite easily obtained thanks to the Silicon/Silica couple, obtaining laser sources is much more difficult because silicon (indirect gap) can not be used to provide optical gain. An alternate solution consists in using molecular bonding of III-V semiconductor based dies onto silicon wafers. In this thesis, we only focus on a very specific source based on Whispering Galery Modes (WGM) inresonators with circular symmetry, with a few micrometers radius. We will see how to take advantage of perturbative elements such as the electrical contacts (necessary absorbing) to decrease the lasing threshold. The use of a semi analytical model provides ultra fast design of these monolithic source, optimizing the the geometry and position of the contacting electrodes. Light collection in an optical waveguide by evanescent coupling to the source leads to complexinteractions. Modelling them from Coupled Mode Theory demonstrates how it works, and how to take advantage of them to control the lasing wavelength. The optical waveguide itself can then be used to promote a single wavelength emission. Laying out active elements around the collecting waveguide, one can get modulated and ultra-compact sources for wavelength tuning or mode hoping applications, with an external active control. The last part of this thesis provides experimental results obtained with a 200 mm pilot line at CEALETI, using CMOS compatible processes. Feasibility of the sources suggested in the previous chapters is demonstrated with their integration in a complete optical link (source, routing and detection).
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  • HAL Id : tel-00558357, version 1

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Fabien Mandorlo. Etude et réalisation de liens optiques hétérogènes à base de semiconducteurs III-V reportés du Silicium. Sciences de l'ingénieur [physics]. Ecole Centrale de Lyon, 2009. Français. ⟨NNT : 2009ECDL0025⟩. ⟨tel-00558357⟩

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