Effects of Atmospheric Turbulence on OAM Beams and Potential Applications in Free-Space Optical Communication

Effects of Atmospheric Turbulence on OAM Beams and Potential Applications in Free-Space Optical Communication

Presenter(s)

Hao Lun Wu

Comments

Presentation: 2:20-2:40 p.m., Jessie Hathcock Hall 180

Description

Free-space optical (FSO) communication, which makes use of a modulated laser beam to achieve data transmission, has gained lots of interest for a long time due to its ability to have secure transmission and potential high data rates. Interest has increased in using beams carrying orbital angular momentum (OAM) for FSO communication, due to their (theoretically) infinite amount of orthogonal modes and potential high resistance to atmospheric turbulence. In this experimental study, Laguerre-Gaussian (LG) beams are used as OAM beams and different orders are generated using a spatial light modulator (SLM). A wave optics simulation method is used to generate phase screens containing simulated atmospheric turbulence, which in turn are used on two SLMs to generate atmospheric turbulence in our experimental setup. In this study, different orders of OAM beams are propagated through atmospheric turbulence, ranging in strength from weak to strong. The distorted beam is recorded using a CCD camera and the images are processed to determine their spot size, divergence, intensity and on-axis scintillation. The effect of the strength of atmospheric turbulence on different orders of LG beam is analyzed using these beam parameters.

Publication Date

4-19-2023

Project Designation

Graduate Research

Primary Advisor

Miranda van Iersel

Primary Advisor's Department

Electro-Optics and Photonics

Keywords

Stander Symposium, School of Engineering

Institutional Learning Goals

Scholarship

Effects of Atmospheric Turbulence on OAM Beams and Potential Applications in Free-Space Optical Communication

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