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Contribution à l'étude de guides à la limite de diffraction couplés : les canaux des fibres microstructurées

Abstract : The general frame of this work are the diffraction limited coupled waveguides having a high index contrast between the core and the cladding, which ensures a strong mode confinement. Thus, one can reduce the core dimensions (~ µm) up to a fundamental limit that maximizes the nonlinear (NL) effects. The tapered microstructured fibres (MOF) and the silica rods are already used in practice, but they are short (~cm), fragile, the fabrication and the handling are difficult, and on cannot make an array (essential for the future integrated circuits of the nano-photonics).
We proposed the use of the trefoil channels of the MOF cladding, where each group of three air holes forms a possible waveguide. Using the near field optical microscopy, we demonstrated these channels are indeed waveguides at an appropriate wavelength, having state of art losses.
After an intermediate stage where we studied the evanescent coupling in an asymmetric two-core multimode MOF, we conceived a multi-core MOF of identical channels, guiding at λ=1,55 µm.
We demonstrated the waveguiding in all the channels, with state of art losses (0.01 dB/mm/channel). Then, by achieving spread output maps for single-channel injection, we demonstrated all the channels are coupled each other. Then, by quantifying and comparing the standard deviations of the CCD output images and the 2D injection mapping, with those of the maps of the theoretical supermodes and the propagation simulations, we proved the high coupling efficiency between all the waveguides.
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https://tel.archives-ouvertes.fr/tel-00157847
Contributor : Alin Marian Apetrei <>
Submitted on : Wednesday, June 27, 2007 - 10:50:14 AM
Last modification on : Thursday, January 11, 2018 - 6:14:36 AM
Long-term archiving on: : Thursday, April 8, 2010 - 9:49:12 PM

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  • HAL Id : tel-00157847, version 1

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Alin Marian Apetrei. Contribution à l'étude de guides à la limite de diffraction couplés : les canaux des fibres microstructurées. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2007. Français. ⟨tel-00157847⟩

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