Solar background noise mitigation using the orbital angular momentum mode in vertical FSO downlink transmissions

J. W. Lee, J. Y. Choi, Y. J. Hyun, S. K. Han

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Free-space optical communication (FSO) is used to provide network configuration flexibility. A network-flying platform-based vertical FSO connection can be employed to enhance mobile network coverage and capacity. Solar background noise can be a potential risk that disrupts the seamless connection in the vertical FSO downlink channel. In this paper, we propose signal transmission using an orbital angular momentum (OAM) beam. The OAM demodulation process can filter sunlight out of the optical receiver except for the signal corresponding to the azimuthal state. We experimentally verified that most of the solar background noise could be reduced. To verify the feasibility of the proposed scheme in a vertical FSO channel, we modeled a FSO vertical downlink with an OAM modulation/demodulation process.

Original languageEnglish
Pages (from-to)33312-33321
Number of pages10
JournalOptics Express
Issue number21
Publication statusPublished - 2021 Oct 11

Bibliographical note

Funding Information:
Acknowledgements. This work was supported by Institute of Information & communications Technology Planning & Evaluation (IITP) grant funded by the Korea government (MSIT) (No.2019-0-00685, Free space optical communication based vertical mobile network).

Funding Information:
Institute for Information and Communications Technology Promotion (2019-0-00685).

Publisher Copyright:
© 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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