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Theses

Controling the Propagation of Light in Multimode Fibers

Abstract : This Ph.D. project aims at using wavefront shaping techniques to probe the modal content of multimode fibers. Doing so is a crucial stepping stone for the implementation of space division multiplexing for telecommunication applications.Recently, new methods to characterize the propagation of modes inside multimode fibers were introduced.They leverage wavefront shaping techniques to measure the transmission matrix, which gives the spatial relationship between the fields entering from one side and exiting from the other side of the medium. This measure is of particular interest to examine how external perturbations affect the coupling between the different propagating modes of a fiber. We present the approach we developed to perform fast and reliable acquisition of these matrices with a lightweight system.Because we can perform numerous measurements in a short time, we characterize the effect of induced deformations and successfully design spatial channels that are robust to disorder. A study of the mechanisms of mode coupling is also performed.Finally, we take advantage of the randomness of the propagation of light in perturbed fibers to design an original approach to generate optical reconfigurable linear operators.
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https://pastel.archives-ouvertes.fr/tel-03405453
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Submitted on : Thursday, October 28, 2021 - 9:07:14 AM
Last modification on : Sunday, June 26, 2022 - 2:20:50 AM

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ESPCI_MaximeMATTHES_2021.pdf
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  • HAL Id : tel-03405453, version 2

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Maxime Matthes. Controling the Propagation of Light in Multimode Fibers. Physics [physics]. Université Paris sciences et lettres, 2021. English. ⟨NNT : 2021UPSLS057⟩. ⟨tel-03405453v2⟩

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