Created by sebastien.popoff on 15/06/2023
All-fiber Control of Entanglement:
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Created by sebastien.popoff on 23/09/2021
Spatiotemporal control of lightJoel A. Carpenter This tutorial investigates various techniques for spatial and/or temporal optical beam manipulation. |
Created by sebastien.popoff on 14/07/2021
Learning and Avoiding Disorder in Multimode FibersSébastien M. Popoff In this work, we demonstrate the existence of a set of spatial channels in multimode fibers that are robust to strong local perturbations. We show that, even for a high level of disorder, light propagation can be characterized by just a few key properties. Related article: doi.org/10.1103/PhysRevX.11.021060 |
Created by sebastien.popoff on 02/11/2020
Learning and avoiding disorder in multimode fibers
[M.W. Matthès, arxiv, 2010.14813 (2020)] In the past 10+ years, numerous advances were made for endoscopic imaging, micromanipulation, or telecommunication applications with multimode fiber. The main limitation to real-life applications is the sensitivity to perturbations that sometimes causes the transmission property of the fiber to change in real-time. To address this issue, the authors (we) show that, even in the presence of strong perturbations, there exists a set of channels that are almost insensitive to perturbations. Interestingly, these channels can be found using only measurements from small perturbation leveraging the so-called generalized Wigner-Smith operator. This requires the measurement of the transmission matrix, which is done thanks to a new technique based on deep learning frameworks that compensate automatically for misalignments and aberrations, allowing fast and easy acquisitions. |