Work

Generalized modeling and turbulence resistance evaluation for higher-order Laguerre-Gaussian beam

Year: 2025

Type: article

Abstract: In current free-space optical (FSO) communication systems, the fundamental Gaussian beam is typically used as the signal carrier. However, its simple spatial structure makes it highly susceptible to atmospheric turbulence, significantly degrading system performance. This study addresses the issue by employing higher-order Laguerre-Gaussian (LG) beams as signal carriers. A universal transmission model based on the modified von Kármán turbulence spectrum is developed using confluent hypergeometric functions. The model reproduces Huygens-Fresnel diffraction integration within 0.9% power error and accelerates computation by more than tenfold. Combined simulations and a 40 Gbps QPSK FSO experiment show that higher-order LG beams exhibit reduced beam spreading, lower power loss, and mitigated scintillation compared to the fundamental Gaussian mode. For a target BER of 1 × 10 −4 , the LG 01 mode beam reduces the transmitted power budget by 1–1.5 dB, while LG 10 and LG 02 beams reduce it by 2–4 dB compared to fundamental Gaussian beam. Incorporating the experimentally measured mixing efficiency penalty into the predictions leaves the mode ranking and performance trends unchanged, further validating the reliability and practical applicability of the proposed intensity model.

Source: Optics Express

DOI: 10.1364/oe.574261

Authors: Wenqi Ma, Xiuquan Li, Yi Qin, Canyi Deng, Guijun Hu

Language: English

Topic: Optical Wireless Communication Technologies

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

Funders: National Key Research and Development Program of China, Jilin Scientific and Technological Development Program

Awards: G4396181327, G5533558064