Intensity-only-measurement mode decomposition in few-mode fibers

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Recovery of optical phases using direct intensity detection methods is an ill-posed problem and some prior information is required to regularize it. In the case of multi-mode fibers, the known structure of eigenmodes is used to recover optical field and find mode decomposition by measuring intensity distribution. Here we demonstrate numerically and experimentally a mode decomposition technique that outperforms the fastest previously published method in terms of the number of modes while showing the same decomposition speed. This technique improves signal-to-noise ratio by 10 dB for a 3-mode fiber and by 7.5 dB for a 5-mode fiber.
Original languageEnglish
Pages (from-to)36769-36783
Number of pages15
JournalOptics Express
Issue number22
Early online date22 Oct 2021
Publication statusPublished - 25 Oct 2021

Bibliographical note

Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Funding: Horizon 2020 Framework Programme (814276); Engineering and Physical Sciences Research Council (EP/R035342/1).


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