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Solitons optiques spatiaux Kerr et photoréfractifs : propriétés fondamentales et application à l'adessage optique

Abstract : This thesis deals with beam self-focalization and optical soliton propagation. The presented results are obtained in two complementary nonlinear media, an ultra-fast Kerr material used in planar configuration and a photorefractive material showing stable self-focusing effect in two dimensions at very low beam power. The depicted studies are based on analytical developments and numerical calculations along with numerous experiments. Potential of soliton-induced waveguides for application to optical switching and reconfigurable crossconnects are considered in particular.

In the first part, we present results on Kerr solitons at telecommunication wavelengths, generated in AlGaAs planar waveguides.We demonstrate than nonlinear absorptions, although low, modify self-focusing effect in a dramatic way. In addition, the influence of pulse duration on soliton propagation has been characterized experimentally. Soliton propagation is observed over 17 diffraction lengths.

In the second part, we study a new type of bright bi-dimensional photorefractive soliton, the photorefractive-photovoltaic screening soliton in LiNbO3. This soliton is induced by an external applied electric field opposed to the intrinsic photovoltaic effect of the material in order to exhibit a focusing nonlinear effect. In agreement with developed semi-analytical and numerical models, the experiments confirm that these solitons represent a simple way to generate straight or curved cylindrical waveguides able to guide visible light and also telecommunication wavelengths.

Finally, we test the potential of solitons for optical switching in the framework of two applications. The first one reveals the capability of spatial Kerr solitons in AlGaAs for fast reconfigurable interconnects. While the second one is a 3-D integrated optical component induced by photorefractive solitons and achieving a 1 by 4 routing function.
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https://tel.archives-ouvertes.fr/tel-00137257
Contributor : Virginie Coda <>
Submitted on : Monday, March 19, 2007 - 11:27:35 AM
Last modification on : Monday, November 23, 2020 - 4:44:05 PM
Long-term archiving on: : Wednesday, April 7, 2010 - 3:02:03 AM

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  • HAL Id : tel-00137257, version 1

Citation

Virginie Coda. Solitons optiques spatiaux Kerr et photoréfractifs : propriétés fondamentales et application à l'adessage optique. Physique [physics]. Université de Franche-Comté, 2006. Français. ⟨tel-00137257⟩

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