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Lasers multi-longueurs d'onde à fibre dopée à l'Erbium utilisant un décaleur de fréquence dans la boucle de contre-réaction

Abstract : "This thesis is focused on the therotical investigation and realization of frequency-shifted erbium-doped fiber laser with the
goal to achieve a multiwavelength laser emission. The first step of this study concerns three laser emission regimes: A
passive Q-Switched regime, a passive modelocked regime and a continuous wave one. This work demonstrates that the
physics behind these emission regimes is fully different because of the use of the frequency shifter inside the laser cavity.
One of the achivements describes in this thesis concerns the realization of a laser source delivering 17 wavelengths covering
the whole C band and emitting in a CW regime. Using a new
fiber Bragg grating writing method, we were able to control the flatness of the laser output spectrum to a level better than 3
dB. This source is then became the key element for chromatic dispersion measurement of an optical fiber link allowing in this
way to achieve an fast, precise and reliable measurement method.
Another important achievement of this work concerns the proposal, realization and theoretical investigation of a dense
multiwavelength modelocked fiber laser using erbium ion as gain medium.
The use of a frequency shifter combined with an electro-optic modulator allows us to achieve a 25 wavelengths source
emetting in a modelocked regime. The pulse train repetition rate for each
wavelength band was equal to 10 GHz and a Δν.Δτ product close to the theoretical limit indicates that the pulses are weakly
chirp.
Finally a numerical investigation of these frequency-shifted fiber laser allowed the discover of
a new Q-Switched regime. We will demonstrate that this pulsed regime comes from an energy redistribution inside the
spectrum itself and that cannot be attribute to the cavity losses modulation."
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Submitted on : Monday, April 24, 2006 - 5:20:27 PM
Last modification on : Tuesday, January 12, 2021 - 4:50:28 PM
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  • HAL Id : tel-00012177, version 1

Citation

Jean-Noël Maran. Lasers multi-longueurs d'onde à fibre dopée à l'Erbium utilisant un décaleur de fréquence dans la boucle de contre-réaction. Physique Atomique [physics.atom-ph]. Université Rennes 1; Université Laval, 2005. Français. ⟨tel-00012177⟩

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