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High bandwidth detection of mechanical stress in optical fibre using coherent detection of Rayleigh scattering

Abstract : Telecommunication fibres are being deployed all over the world, connecting distant people, institutions, companies with an outstanding quality of service in terms of data rate and latency. Their strategic value in terms of global economy and daily life is now undeniable. Monitoring such an infrastructure has become mandatory, and that far beyond the standard case of breaks localization. From a broader standpoint, optical fibres are an alternative to electro-dynamic point sensors, with a strong asset: the capability to detect and localize multiple independent phenomena all along a fibre. Thus, the millions of kilometers of currently deployed optical fibre around the world constitute a huge potential base of sensors. Distributed vibration sensors have a huge potential regarding sensing of dynamic events, detecting of multiple acoustic signatures up to speech signals. In this thesis, we show how distributed optical fibre sensors can be designed on top of telecommunication fibres, namely standard single mode fibres, and we explore their potential in terms of reach, detection threshold, and sensing bandwidth. We present the interrogator systems for distributed fibre sensing and build a dual-polarization numerical model of such an interrogation system and fibre sensor. Secondly, we tackle the coherent fading issue by means of frequency diversity in the digital domain, i.e. directly applicable at the modulation of the interrogation sequences, before entering the optical domain. We developed MIMO-OFDM which retrieves independent channel estimations from a single fibre segment; the estimations are further combined, and the obtained estimations are assessed with regards to the reliability metric. Throughout this thesis, many experimental measurements were conducted, assessing the capabilities of the Coherent-MIMO interrogator on single-mode-fibre sensors in terms of reach, bandwidth, and detection threshold. We also demonstrate the co-propagation of a sensing signal along with high data rate channels, without any impact on the transmitted data, paving the way to the enhanced monitoring and telemetry in deployed telecommunication networks.
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Submitted on : Thursday, April 7, 2022 - 9:33:09 PM
Last modification on : Friday, April 8, 2022 - 3:06:04 AM
Long-term archiving on: : Friday, July 8, 2022 - 8:41:35 PM


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  • HAL Id : tel-03634711, version 1



Sterenn Guerrier. High bandwidth detection of mechanical stress in optical fibre using coherent detection of Rayleigh scattering. Networking and Internet Architecture [cs.NI]. Institut Polytechnique de Paris, 2022. English. ⟨NNT : 2022IPPAT004⟩. ⟨tel-03634711⟩



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