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Contribution à la conception de guides optiques à fortes susceptibilités non-linéaires d'ordre 3

Abstract : The growth of data stream in fiber optics networks requires the exploration of new all optical functions for the signal processing at rates beyond 40 Gb.s-1. In this context, this thesis undertakes to offer a new approach to exploit some electronic conjugated polymers having very high third-order nonlinearity. Nevertheless the main challenge remains to perform single-mode waveguides based on these polymers. The kind of material chosen here is the Poly(3-AlkylThiophene), P3AT, because its good solubility permits to form films. In the first part of the manuscript, the states of the art of the targeted functions and the nonlinear materials needed for making them are presented. We explain why the P3AT can fulfil the requirements to perform miniaturized all-optical ultra-fast functions. Then we have first developed the self-phase modulation technique to characterize the nonlinearity of guides at 1550 nm. Its validity is confirmed by measuring the Kerr coefficient of standard and special fibers. Then, before designing the polymer waveguides, it was necessary to synthesize the polymer for ensuring a reproducible solubility in order to make thick enough films for channel waveguides fabrication. Several guide configurations have been studied such as ridge, strip-loaded and embedded waveguides. Each of them has been tested and characterized with passive or standard polymers. Unfortunately with the P3AT, any transmission of the guide could not be demonstrated. However we have shown that the optical losses are not due to material intrinsic absorption but rather caused by extrinsic light scattering.
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Submitted on : Friday, February 12, 2010 - 4:24:22 PM
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  • HAL Id : tel-00456183, version 1

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Khalida Messaad. Contribution à la conception de guides optiques à fortes susceptibilités non-linéaires d'ordre 3. Physique [physics]. Université Rennes 1, 2009. Français. ⟨tel-00456183⟩

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