Génération photonique de signaux micro-ondes très bas bruit de phase par peignes de fréquences optiques

Abstract : State-of-the-art microwave oscillators are typically bulky systems requiring tedious maintenance which is hindering their use in mobile applications or in demanding environments. The invention of the optical frequency combs, which was awarded a Nobel prize in 2005, was a game-changer as it enabled a high-fidelity transfer of the unrivalled properties of optical oscillators to the microwave domain. In the technique used at SYRTE, the optical frequency division, a microwave signal can be extracted from a near-infrared ultra-stable laser using photodetection. The transfer is accompanied by a reduction of phase noise equal to the microwave-to-optical frequency ratio squared, i.e. more than eight order of magnitudes. This benefit is however reduced by several processes producing excess noise during the transfer. The work described in this thesis is the generation of the lowest phase noise microwave signal ever reported. The different processes inducing excess noise are analyzed and, in part, overcome. Specifically, the conversion of the femtosecond laser intensity noise to the microwave phase noise is studied thoroughly and its effect significantly reduced. The results augur that the optical approaches in microwave generation are on the verge to disrupt the state-of-the-art. The noise levels demonstrated and the techniques developed can benefit a large range of applications such as mobile radars, time and frequency metrology or the next generation of ultrafast telecommunication networks.
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Romain Bouchand. Génération photonique de signaux micro-ondes très bas bruit de phase par peignes de fréquences optiques. Physique [physics]. Université Pierre et Marie Curie - Paris VI, 2017. Français. ⟨NNT : 2017PA066507⟩. ⟨tel-01792899v2⟩

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