Abstract: Free-space optical (FSO) communication is widely used in satellites, ships, aircraft, and ground stations due to its advantages of high speed, large capacity, good confidentiality, and strong anti-interference ability. Variable-beam divergence angle (VBDA) technology makes FSO systems more flexible; this has the benefits of higher acquisition probability, stronger tracking ability, wider communication link range, and lower energy consumption. In other words, the study of VBDA has both theoretical significance and practical relevance. This paper conducts a comprehensive search of relevant scientific databases, journals, conference proceedings, patents, and books to identify publications related to VBDA technology. We analyze these publications, classify and organize various VBDA techniques based on their respective methods. To the best of our knowledge, this is the first review of VBDA technology. In this paper, we first explain the basic principle of changing the beam divergence angle by employing the ABCD matrix, and further furnish a detailed overview of the methods used for VBDA along with their corresponding advantages and disadvantages. In addition, we provide a comprehensive summary of the research conducted using VBDA technology across different link types. Lastly, we identify the challenges and potential future research directions for VBDA technology. Keywords: 6G; free-space optical (FSO) communication; variable-beam divergence angle

Feature papers represent the most advanced research with significant potential for high impact in the field. A Feature Paper should be a substantial original Article that involves several techniques or approaches, provides an outlook for future research directions and describes possible research applications.

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Zhang G, Wu J, Li Y, Wang X, Yu X, Gao S, Ma L. A Review of Variable-Beam Divergence Angle FSO Communication Systems. Photonics. 2023; 10(7):756. https://doi.org/10.3390/photonics10070756

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Zhang, Guoqiang, Jiabin Wu, Yatian Li, Ximing Wang, Xichang Yu, Shijie Gao, and Lie Ma. 2023. "A Review of Variable-Beam Divergence Angle FSO Communication Systems" Photonics 10, no. 7: 756. https://doi.org/10.3390/photonics10070756

Zhang, Guoqiang, Jiabin Wu, Yatian Li, Ximing Wang, Xichang Yu, Shijie Gao, and Lie Ma. 2023. "A Review of Variable-Beam Divergence Angle FSO Communication Systems" Photonics 10, no. 7: 756. https://doi.org/10.3390/photonics10070756

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Zhang, G.; Wu, J.; Li, Y.; Wang, X.; Yu, X.; Gao, S.; Ma, L. A Review of Variable-Beam Divergence Angle FSO Communication Systems. Photonics 2023, 10, 756. https://doi.org/10.3390/photonics10070756

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Zhang, G., Wu, J., Li, Y., Wang, X., Yu, X., Gao, S., & Ma, L. (2023). A Review of Variable-Beam Divergence Angle FSO Communication Systems. Photonics, 10(7), 756. https://doi.org/10.3390/photonics10070756

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Zhang, G.; Wu, J.; Li, Y.; Wang, X.; Yu, X.; Gao, S.; Ma, L. A Review of Variable-Beam Divergence Angle FSO Communication Systems. Photonics 2023, 10, 756. https://doi.org/10.3390/photonics10070756

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Zhang G, Wu J, Li Y, Wang X, Yu X, Gao S, Ma L. A Review of Variable-Beam Divergence Angle FSO Communication Systems. Photonics. 2023; 10(7):756. https://doi.org/10.3390/photonics10070756

Zhang, G., Wu, J., Li, Y., Wang, X., Yu, X., Gao, S., & Ma, L. (2023). A Review of Variable-Beam Divergence Angle FSO Communication Systems. Photonics, 10(7), 756. https://doi.org/10.3390/photonics10070756

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