Causes and mitigation of modal crosstalk in OAM multiplexed optical communication links

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

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


There has been a growing interest in orbital angular momentum (OAM) multiplexed communication links because of their potential for high capacity data transmission. However, OAM multiplexed communication links are sensitive to various degradation effects, and one of the key challenges is to compensate for the potential intermodal crosstalk. In this chapter, we review the causes and mitigation techniques for channel crosstalk in OAM multiplexed communication links. Specifically: Channel crosstalk in OAM multiplexed links could be caused by various system and environmental effects, such as atmospheric turbulence, misalignment, and obstructions. Three technical topics for crosstalk mitigation, including adaptive optics, spatial mode manipulation, and digital signal processing are discussed in this chapter. Several works within these topics are presented as examples.

Original languageEnglish
Title of host publicationStructured Light for Optical Communication
Subtitle of host publicationA Volume in Nanophotonics
Number of pages31
ISBN (Electronic)9780128215104
StatePublished - 1 Jan 2021


  • Crosstalk
  • Free-space optical communication
  • Orbital angular momentum
  • Spatial mode
  • Turbulence
  • Vortex beam


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