High-capacity Free-space Optical Communications Using Multiplexing of Multiple OAM Beams

Alan E. Willner*, Runzhou Zhang, Kai Pang, Haoqian Song, Cong Liu, Hao Song, Xinzhou Su, Huibin Zhou, Nanzhe Hu, Zhe Zhao, Guodong Xie, Yongxiong Ren, Hao Huang, Moshe Tur

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review


There has been extensive interest in increasing data capacity and spectral efficiency of free-space optical (FSO) communications. This chapter reviews the principle and experimental demonstrations of utilizing the orbital angular momentum (OAM) multiplexing to achieve high-capacity FSO systems. Topics in this chapter include technical challenges, first-of-its-kind demonstrations of OAM-multiplexed FSO links, mitigation approaches for inter-channel crosstalk, and OAM systems in airborne and underwater environments. Potential further investigation and exploration of OAM multiplexing techniques are also discussed in each section of this chapter.

Original languageEnglish
Title of host publicationElectromagnetic Vortices
Subtitle of host publicationWave Phenomena and Engineering Applications
Number of pages44
ISBN (Electronic)9781119662945
ISBN (Print)9781119662822
StatePublished - 3 Dec 2021


  • Free-space optical communications
  • Multiplexing techniques
  • Optical vortex
  • Orbital angular momentum


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