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Etude en bruit de systèmes optiques hyperfréquences Modélisation, caractérisation et application à la métrologie en bruit de phase et à la génération de fréquence

Houda Brahimi 1
1 LAAS-MOST - Équipe Microondes et Opto-microondes pour Systèmes de Télécommunications
LAAS - Laboratoire d'analyse et d'architecture des systèmes
Abstract : Optical devices are more and more used in microwave systems, taking benefit of the low losses of optical fibers, of their small size and their immunity to electrical parasitic signals. An example of these systems is the microwave optical oscillator, either based on optical resonators or delay lines, which can deliver ultra high spectral purity signals. However, the performance of these systems is dependent on the performance of the devices used for the electrical to optical or optical to electrical conversions, the chosen optical modulation technique, the necessary microwave amplifiers, the devices biasing circuits, the quality of the optical fiber and, above all, the topology chosen to build the whole system. It is thus important to be able to compute the system phase noise using an appropriate modelling approach. This thesis allowed us to develop such approach using specific microwave circuit design software: Agilent ADS. This software has been designed in the 1990s in order to take into account the frequency conversion phenomena between the noise sidebands around the different harmonics of the RF signal (including DC). This software may be used to simulate the microwave parts of a microwave optical system. However, it generally does not include any specific model for the optical devices involved in these systems. A solution to this problem is to find a representation of these devices which can be implemented in the microwave simulator, using either an equivalent electrical circuit or a mathematical model. Finally, a Mach-Zehnder modulator based optical link and its noise performance is successfully described. A model is proposed for an optical delay line microwave frequency discriminator and also for an optical discriminator. Thanks to this study, an optical delay line microwave frequency discriminator is designed and realized. The phase noise performance of this system corresponds to the state of the art.
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Houda Brahimi. Etude en bruit de systèmes optiques hyperfréquences Modélisation, caractérisation et application à la métrologie en bruit de phase et à la génération de fréquence. Micro et nanotechnologies/Microélectronique. Université Paul Sabatier - Toulouse III, 2010. Français. ⟨tel-00554165⟩

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