Dérive dans les modulateurs électro-optiques Mach-Zehnder : analyse physique et résolution

Abstract : The modulators currently developed for high speed optical telecommunications generally suffer, in their DC part, from a drift phenomenon, whose causes are not completely understood. In order to find the origins of this drift we started by characterizing a commercial Mach-Zehnder modulator. This enabled us to identify the existence of three phenomena : a first phenomenon with a fast response time related to the silica layer, a second one related to the anisotropy of the substrate and a third phenomenon linked to the heterogeneities of surface induced during the fabrication of the device. This analysis led us to consider a solution to the problems of the drifts related to charges relaxation in the structure of the device. This solution consists in the compensation of the drifts related to the anisotropy of the substrate of LiNbO3 by those due to the electric heterogeneities of the surface. In order to implement this solution we have developed a physical model based on the Maxwell s equations which allows to calculate the map of the ideal electrical conductivity allowing to remove the long-term drift. This calculation requires the knowledge of the response times of the LiNbO3 substrate. This is why we have developed two experimental setups, one based on the Senarmont s method and the other on a Mach-Zehnder interferometer. These setups enabled us to measure the temporal evolution of the electric field induced in the substrate during the application of a voltage step and to deduce these response times from them.
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Rachid Radouani. Dérive dans les modulateurs électro-optiques Mach-Zehnder : analyse physique et résolution. Autre [cond-mat.other]. Université Paul Verlaine - Metz, 2006. Français. ⟨NNT : 2006METZ022S⟩. ⟨tel-01752461⟩

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