Simultaneous turbulence mitigation and channel demultiplexing using a single multi-plane light convertor for a free-space optical link with two 100-Gbit/s OAM channels

Hao Song*, Xinzhou Su, Haoqian Song, Runzhou Zhang, Zhe Zhao, Nanzhe Hu, Kaiheng Zou, Huibin Zhou, Kai Pang, Cong Liu, Karapet Manukyan, Ahmed Almaiman, Andreas F. Molisch, Robert W. Boyd, Shlomo Zach, Moshe Tur, Alan E. Willner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A single multi-plane light convertor (MPLC) is applied to simultaneously mitigate turbulence-induced crosstalk and demultiplex two orbital angular momentum (OAM) multiplexed channels for a free-space optical link. Comprised of six programmable phase planes, the MPLC is placed at the receiver side for turbulence mitigation and channel demultiplexing. Propagating through the cascaded phase planes, two coaxial turbulence-distorted OAM beams each carrying one data channel are shaped and sorted into two differently positioned Gaussian beams with low inter-channel crosstalk. As an experimental demonstration, one MPLC adaptively mitigates the turbulence-induced crosstalk by up to 26 dB for two OAM-multiplexed channels (ℓ = {−1, +2}). Two 100-Gbit/s quadrature-phase-shift-keying (QPSK) channels are recovered with an up-to-1.5-dB optical signal-to-noise ratio (OSNR) penalty under one turbulence realization.

Original languageEnglish
Article number127359
JournalOptics Communications
Volume501
DOIs
StatePublished - 15 Dec 2021

Keywords

  • Free-space optical communications
  • Optical vortices
  • Turbulence

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