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Theses

Etude et applications des amplificateurs paramétriques à fibre optique

Abstract : Over the past few years fibre optical parametric amplifiers (FOPA) have shown potential for many practical applications and permitted significant progress for future ultra high-bit-rate telecommunication systems, as the fundamental mechanism allows for a significant enhancement of the transmission bandwidth with respect to other optical amplifiers. In particular, dual-pump FOPA has proven to be the most efficient way for flat and wide gain bandwidth. The thesis provides a comprehensive review of the different physical mechanisms for parametric amplification and gives a detailed theoretical and experimental study of two-pump FOPAs. In particular, we focus on the signal distortion and spectral broadening induced by the phase modulation of the pumps, needed for suppressing the backward stimulated Brillouin scattering. We theoretically show that both the signal gain distortion and idler spectral broadening can fully suppressed when using counter-phase modulation of the two pump waves. We then report the fabrication of an integrated LiNbO3 Y-junction synchronized double phase modulator fully packaged for RF-application up to 40 GHz. This optical modulator allows for delivering simultaneously counter-phase highspeed modulation and coupling for two input channels. It was designed for application to fibre-optical parametric amplifier and wavelength converters for suppressing idler spectral broadening and signal gain distortion caused by phase modulation itself. With this component, Idler spectral broadening suppression is experimentally demonstrated over all the parametric gain band of a two-pump parametric amplifier operating in the 1.55 μm region. We then report the experimental observation of the parametric gain mapping along an optical fibre, using the so-called Brillouin optical time domain analysis. This method, developed in collaboration with the EPFL in Switzerland, allows us to observe for the first time both the effect of pump depletion and of the dispersion longitudinal fluctuations. Finally, the last part of the manuscript deals with a theoretical study of a parametric amplifier operating at 1 μm for optical pulse replication in collaboration with the CEA in Bordeaux.
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https://tel.archives-ouvertes.fr/tel-00544865
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Submitted on : Thursday, December 9, 2010 - 10:24:18 AM
Last modification on : Thursday, November 12, 2020 - 9:42:07 AM
Long-term archiving on: : Thursday, March 10, 2011 - 1:17:55 PM

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  • HAL Id : tel-00544865, version 1

Citation

A. Vedadi. Etude et applications des amplificateurs paramétriques à fibre optique. Sciences de l'ingénieur [physics]. Université de Franche-Comté, 2008. Français. ⟨tel-00544865⟩

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