Study on the propagation performance of OAM-hopping in atmospheric turbulence channel

Yadi Chen; Jiancang Liu; Bing Lei

doi:10.1117/12.3033048

4 December 2024 Study on the propagation performance of OAM-hopping in atmospheric turbulence channel

Yadi Chen, Jiancang Liu, Bing Lei

Proceedings Volume 13283, Conference on Spectral Technology and Applications (CSTA 2024); 132830C (2024) https://doi.org/10.1117/12.3033048
Event: Conference on Spectral Technology and Applications (CSTA 2024), 2024, Dalian, China

Abstract

Free space optical communication (FSO) is susceptible to atmospheric turbulence, which greatly affects the practical application of atmospheric laser communication. In this paper, we explore a simple and effective anti-atmospheric turbulence technique based on the feasibility study of orbital angular momentum beam (OAM) hopping. Different modes of OAM beams with distinct topological charges are sequentially transmitted within a symbol period to achieve diversity gains by ensuring orthogonality among them and varying spatial paths. The transmission characteristics of OAM beams in atmospheric turbulence are analyzed, and an intensity modulation/direct detection (IM/DD) FSO model is established under the Gamma-Gamma atmospheric turbulence channel. By comparing the power fluctuation and bit error rate (BER) of the communication system employing OAM-hopping with single-mode beams system, the effects of mode spacing and the number of mode hopping on the turbulence resistance capability of the OAM-hopping mechanism are investigated. Simulation results demonstrate that, under moderate turbulence conditions (𝐶_n² = 1 × 10⁻¹³), using the mode set {+1, +3, +5} for OAM-hopping transmission reduces the power fluctuations and BER by approximately 10.6% and 20.1%, respectively, compared to the system using only a single-mode beam for transmission. The research findings validate the feasibility and effectiveness of OAM mode-hopping technology for turbulence-resistant applications in FSO, providing an important technical approach to enhance the performance of FSO systems in atmospheric turbulence.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yadi Chen, Jiancang Liu, and Bing Lei "Study on the propagation performance of OAM-hopping in atmospheric turbulence channel", Proc. SPIE 13283, Conference on Spectral Technology and Applications (CSTA 2024), 132830C (4 December 2024); https://doi.org/10.1117/12.3033048

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KEYWORDS

Turbulence

Atmospheric turbulence

Free space optics

Telecommunications

Optical transmission

Atmospheric propagation

Resistance

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