Open AccessSpiral spectrum of high-order elliptic Gaussian vortex beams in a non-Kolmogorov turbulent atmosphere
Author(s) -
Yankun Wang,
Lu Bai,
Jinyu Xie,
Danmeng Zhang,
Qiang Lv,
Lixin Guo
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.416324
Subject(s) - physics , optics , turbulence , optical vortex , gaussian beam , vortex , optical communication , free space optical communication , gaussian , atmosphere (unit) , computational physics , angular momentum , beam (structure) , classical mechanics , quantum mechanics , mechanics , meteorology
In a free space optical communication system based on vortex beams, the effects of spread and crosstalk caused by atmospheric turbulence should not be ignored. The orbital angular momentum (OAM) spectrum of the signal based on elliptic Gaussian beam (EGB) after propagation through non-Kolmogorov turbulent atmosphere are deduced, and a theoretical model of the spiral spectrum of EGB propagating through turbulent atmosphere is obtained. Numerically calculated OAM modes detection and crosstalk probability under different ellipticity parameters. The results show that the ellipticity parameter has a significant impact on the OAM spectral distribution of EGB and the transmission characteristics after turbulent atmosphere. The selection of appropriate ellipticity parameter can correspondingly reduce the degradation and crosstalk caused by turbulent atmosphere. We also compared a Laguerre-Gaussian beam (LGB) with EGB and pointed out the advantages and limitations of these two kinds of beams. The research results may be useful in the field of short distance optical communication and OAM-based multiplex communication.