Compensating for Optical Beam Scattering and Wandering in FSO Communications

Author

Hulea, M. ; Ghassemlooy, Zabih ; Rajbhandari, Sujan ; Xuan Tang

Author_Institution

Tech. Univ. Gheorghe Asachi of Iasi, Iasi, Romania

Volume

32

Issue

7

fYear

2014

fDate

1-Apr-14

Firstpage

1323

Lastpage

1328

Abstract

In this paper we introduce a simple and effective method for substantially reducing the beam spot wandering and scattering effects in the free space optical (FSO) communications using a spherical concave mirror (SCM). The advantages of employing SCMs for focusing the light onto a small area photodetector are improved efficiency in collecting income scattered light beam in a turbulence channel and the detachment between the position of the SCM focal point and fluctuations of the refractive index of the channel. The proposed method is experimentally evaluated in an indoor controlled turbulence environment over a propagation span of up to 104 m. The results testify that SCM can effectively compensate the optical spot scattering and wandering effect, thus leading to improved performance of the FSO system.

Keywords

atmospheric light propagation; atmospheric turbulence; laser beams; light scattering; mirrors; optical focusing; optical links; photodetectors; refractive index; telecommunication channels; FSO communications; SCM focal point; beam spot wandering; free space optical communications; indoor controlled turbulence environment; light focusing; light propagation; optical beam scattering; photodetector; refractive index; scattered light beam; spherical concave mirror; turbulence channel; Laser beams; Mirrors; Optical beams; Optical fiber communication; Optical receivers; Optical transmitters; Air turbulence; concave spherical mirrors; free space optical (FSO) link; laser beams scattering and wandering;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2014.2304182

Filename

6730657