Advanced Digital Signal Processing for High-Capacity Mode-Division Multiplexed Free-Space Optical Communications


Spatial modes provide a potential dimension to boost the capacity of free-space optical (FSO) communication systems. Various modal basis sets can be used. For a given aperture size, complete orthogonal modal basis sets can provide higher capacity compared to incomplete modal basis sets, but are more sensitive to FSO channel impairments, such as atmospheric turbulence. In this invited paper, we review our recent progress in using advanced digital signal processing algorithms for the implementation of high-capacity mode-division multiplexed FSO communication systems when employing complete modal basis sets. Besides turbulence, the relatively high inter-mode crosstalk from a commercial multiplexer/demultiplexer has been taken into account. By employing adaptive loading at the transmitter side and/or advanced multiple-input multiple-output detection algorithms at the receiver side, record-high single-wavelength transmission data rates and spectral efficiency have been achieved over both turbulence-free and turbulent FSO links, where all key devices are commercially available.

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Divisions: College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
College of Engineering & Physical Sciences
Additional Information: Funding: This work was partly supported by EPSRC under grant numbers EP/T009047/1, EP/T009012/1, EP/S003436/1, and EP/S016171/1; European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 713694; Future and Emerging Technologies Open grant agreement Super-pixels No. 829116 Copyright © 2023 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Uncontrolled Keywords: atmospheric turbulence,digital signal processing,free-space optics,mode-division multiplexing,multiple-input multiple-output,optical wireless communication
ISBN: 979-8-3503-0304-9, 979-8-3503-0303-2
Last Modified: 23 May 2024 07:32
Date Deposited: 07 Sep 2023 09:22
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Related URLs: https://ieeexpl ... cument/10207300 (Publisher URL)
http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Conference contribution
Published Date: 2023-08-08
Accepted Date: 2023-01-01
Authors: Hu, Zhouyi (ORCID Profile 0000-0002-8891-6341)
Chen, Zhaozhong
Li, Yiming (ORCID Profile 0000-0002-9442-2591)
Benton, David M. (ORCID Profile 0000-0003-0663-1404)
Ali, Abdallah A. I.
Patel, Mohammed
Lavery, Martin P. J.
Ellis, Andrew D. (ORCID Profile 0000-0002-0417-0547)



Version: Accepted Version

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