Algorithmic decoding of dense OAM signal constellations for optical communications in turbulence

Jaime A. Anguita*, Jaime E. Cisternas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We demonstrate an optical detection and decoding strategy to increase the information rate and spectral efficiency of free-space laser communication links affected by turbulence by means of dense orbital angular momentum (OAM) modulation. Using three candidate receiver architectures–based on a Shack-Hartmann sensor, a Mode Sorter, and a complex conjugate projection scheme as a base case–we demonstrate an algorithmic classification system based on the received OAM spectra produced by these architectures. This classification scheme allows low-error-rate data transmission in turbulence using 16-OAM, 32-OAM, and 64-OAM symbol constellations, with OAM states between −20 and 20. We evaluate and compare their performance under weak to strong atmospheric turbulence conditions using an accuracy metric and confusion matrices.

Original languageEnglish
Pages (from-to)13540-13555
Number of pages16
JournalOptics Express
Volume30
Issue number8
DOIs
StatePublished - 11 Apr 2022

Bibliographical note

Publisher Copyright:
© 2022 Optica Publishing Group

Keywords

  • Decoding
  • Optical communication

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