Demonstration of 10-channel mode- and polarization-division multiplexed free-space optical transmission with successive interference cancellation DSP

Abstract

We experimentally demonstrate 10-channel mode-division multiplexed free-space optical transmission with five spatial modes, each carrying 19.6925-Gbaud dual-polarization quadrature phase shift keying signals. Strong inter-mode cross talk is observed in our commercially available photonic lantern based system when using a complete orthogonal mode set as independent channels. A successive interference cancellation based multiple-input multiple-output digital signal processing (DSP) algorithm is first applied to mitigate the inter-mode cross talk in mode-division multiplexed systems. The DSP also supports unequal transmit and receive channel numbers to further improve the cross talk resiliency. Compared to the conventional minimum mean square error DSP, the required optical signal-to-noise ratio of the successive interference cancellation DSP is decreased by approximately 5 dB at the hard-decision forward error correction limit. As a result, this system demonstrates a record-high independent channel number of 10 and spectral efficiency of 13.7 b/s/Hz in mode-division multiplexed free-space optical systems.

Publication DOI: https://doi.org/10.1364/OL.456235
Dataset DOI: https://doi.org/10.17036/researchdata.aston.ac.uk.00000536
Divisions: College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
College of Engineering & Physical Sciences
College of Engineering & Physical Sciences > School of Informatics and Digital Engineering > Electrical and Electronic Engineering
Additional Information: Published by Optica Publishing Group 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: H2020 Marie Skłodowska-Curie Actions (713694); Engineering and Physical Sciences Research Council (EP/S003436/1, EP/S016171/1, EP/T009047/1).
Publication ISSN: 1539-4794
Full Text Link:
Related URLs: https://opg.opt ... I=ol-47-11-2742 (Publisher URL)
PURE Output Type: Article
Published Date: 2022-06-01
Published Online Date: 2022-05-20
Accepted Date: 2022-05-03
Submitted Date: 2022-02-15
Authors: Li, Yiming
Hu, Zhouyi (ORCID Profile 0000-0002-8891-6341)
Benton, David M. (ORCID Profile 0000-0003-0663-1404)
Ali, Abdallah
Patel, Mohammed
Ellis, Andrew D. (ORCID Profile 0000-0002-0417-0547)

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