Physical-layer security in orbital angular momentum multiplexing free-space optical communications

Xiaole Sun, Ivan B. Djordjevic

Research output: Contribution to journalArticlepeer-review

83 Scopus citations


The physical-layer security of a line-of-sight (LOS) free-space optical (FSO) link using orbital angular momentum (OAM) multiplexing is studied. We discuss the effect of atmospheric turbulence to OAM-multiplexed FSO channels. We numerically simulate the propagation of OAM-multiplexed beam and study the secrecy capacity. We show that, under certain conditions, the OAM multiplexing technique provides higher security over a single-mode transmission channel in terms of the total secrecy capacity and the probability of achieving a secure communication. We also study the power cost effect at the transmitter side for both fixed system power and equal channel power scenarios.

Original languageEnglish (US)
Article number7386572
JournalIEEE Photonics Journal
Issue number1
StatePublished - Feb 2016


  • Atmospheric turbulence
  • Free-space optical communication
  • Orbital angular momentum (OAM) multiplexing
  • Physical layer security
  • Secrecy capacity

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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