Enhanced Atmospheric Turbulence Resiliency With Successive Interference Cancellation DSP in Mode Division Multiplexing Free-Space Optical Links

Yiming Li, Zhaozhong Chen, Zhouyi Hu, David M. Benton, Abdallah A. I. Ali, Mohammed Patel, Martin P. J. Lavery, Andrew D. Ellis

Research output: Contribution to journalArticlepeer-review

Abstract

We experimentally demonstrate the enhanced atmospheric turbulence resiliency in a 137.8 Gbit/s/mode mode-division multiplexing free-space optical communication link through the application of a successive interference cancellation digital signal processing algorithm. The turbulence resiliency is further enhanced through redundant receive channels in the mode-division multiplexing link. The proof of concept demonstration is performed using commercially available mode-selective photonic lanterns, a commercial transponder, and a spatial light modulator based turbulence emulator. In this link, 5 spatial modes with each mode carrying 34.46 GBaud dual-polarization quadrature phase shift keying signals are successfully transmitted with an average bit error rate lower than the hard-decision forward error correction limit. As a result, we achieved a record-high mode- and polarization-division multiplexing channel number of 10, a record-high line rate of 689.23 Gbit/s, and a record-high net spectral efficiency of 13.9 b/s/Hz in emulated turbulent links in a mode-division multiplexing free-space optical system.
Original languageEnglish
Pages (from-to)7769-7778
JournalJournal of Lightwave Technology
Volume40
Issue number24
Early online date30 Sep 2022
DOIs
Publication statusPublished - 15 Dec 2022

Bibliographical note

© 2022, IEEE. UKRI Rights Retention Statement: For the purpose of open access, the author has applied a Creative Commons Attribution (CC BY) licence to any Author Accepted Manuscript version arising.

Research supported by EPSRC under grant numbers EP/T009047/1, EP/T009012/1, EP/S003436/1, and EP/S016171/1. Research supported by European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 713694, and Future and Emerging Technologies Open grant agreement Super-pixels No. 829116.

Keywords

  • Mode division multiplexing (MDM)
  • free-space optics (FSO)
  • multiple-input multiple-output (MIMO)
  • successive interference cancellation (SIC)
  • turbulence

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