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LASER A FIBRE POUR LES TELECOMMUNICATIONS MULTIPLEXEES EN LONGUEUR D'ONDE : ETUDE DE L'ACCORDABILITE EN LONGUEUR D'ONDE ET DE LA GENERATION DE TRAINS MULTI-LONGUEURS D'ONDE D'IMPULSIONS PAR VOIE ELECTRO-OPTIQUE

Abstract : The development of multi-wavelength and tunable sources could give the opportunity to facilitate the installation of fibre-optic wavelength-division-multiplexed systems of telecommunications and could also enable the reconfiguration of the network at the optical level. In that frame, the proposed work studies a ring fibre laser, which includes an erbium-doped fibre amplifier as gain medium and an electro-optically-tunable Lyot filter integrated on lithium niobate. When a continuous control is applied to the filter, we experimentally and numerically demonstrate that the wavelength of emission can be tuned over 18.8 nm with power fluctuations not greater than 3.6 dB. Furthermore, we observe that the switching of the laser wavelength is limited by the gain medium response. Moreover, it is shown that pulse generation can be achieved by use of an intracavity lithium niobate modulator and could be integrated as a new function on the filtre chip. Finally, we also investigate the behaviour of the laser when the filter transmission varies. When a "staircase" or saw-tooth signal is applied to the filter with a frequency lower than a few kilohertz, generation of sequences of pulses with different wavelength is demonstrated. At higher frequencies, sine-wave modulation of the filtre transmission allows to create pulses via a new type of mode-locking technique.
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https://tel.archives-ouvertes.fr/tel-00003336
Contributor : Stéphane Calvez <>
Submitted on : Wednesday, September 10, 2003 - 9:46:29 AM
Last modification on : Friday, April 2, 2021 - 3:34:56 AM
Long-term archiving on: : Friday, April 2, 2010 - 6:44:15 PM

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  • HAL Id : tel-00003336, version 1

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Stéphane Calvez. LASER A FIBRE POUR LES TELECOMMUNICATIONS MULTIPLEXEES EN LONGUEUR D'ONDE : ETUDE DE L'ACCORDABILITE EN LONGUEUR D'ONDE ET DE LA GENERATION DE TRAINS MULTI-LONGUEURS D'ONDE D'IMPULSIONS PAR VOIE ELECTRO-OPTIQUE. Autre. Université de Franche-Comté, 2002. Français. ⟨tel-00003336⟩

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