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Réalisation de sources impulsionnelles pour les télécommunications

Abstract : The work carried out during this PhD within ENSSAT's ""Laboratoire d'optronique"" has been associated with the development of a new research theme on the realisation and characterisation of 1.55 μm pulsed sources with high extinction ratios, low chirp and high repetition rates. Such sources can find applications in optical telecommunications such as in transmission, or in the development of new methods for all-optical measurement or all optical clock recovery. To realise such sources, we have used mode-locked semiconductor laser diodes subject to optical feedback, and the thesis describes a detailed experimental and theoretical study of such lasers. After a brief review of the main techniques used to develop ultrashort pulse sources, we present the theoretical background required to understand the principles of optical feedback, and give an overview of the existing types of pulse sources reported in the literature. We then focus on a numerical analysis of the dynamics of a semiconductor laser subject to nonlinear optical feedback and show that such feedback can be used to achieve passive mode-locking with repetition rates as high as 20 GHz. Moreover, the use of a filtered feedback (provided by a fiber Bragg grating as an external reflector) allows
Fourier transform limited pulses to be obtained. We also describe the manufacturing process of cavities composed of a Bragg grating and a microlens. We then present a theoretical model appropriate for both a numerical study of lasers subject to filtered optical feedback as well as a steady states analysis. We finish this study with the analysis of the role of the injected signal in the dynamical behaviour of a laser diode subject to optical feedback.
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Submitted on : Monday, March 3, 2008 - 2:53:56 PM
Last modification on : Tuesday, January 12, 2021 - 4:50:41 PM
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  • HAL Id : tel-00260197, version 1


Celine Guignard. Réalisation de sources impulsionnelles pour les télécommunications. Physique Atomique [physics.atom-ph]. Université Rennes 1, 2005. Français. ⟨tel-00260197⟩



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