Title :
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
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;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2014.2304182
