By Topic

Impacts of laser beam diverging angle on free-space optical communications

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
Zhijun Zhao ; Dept. of Electr. & Comput. Eng., Michigan Technol. Univ., Houghton, MI, USA ; Rui Liao ; Yuchi Zhang

A free-space optical (FSO) communication system that does not implement compensation strategies for the effects of beam wander may experience deep long-term channel fades or even severe communication outage when the laser spot wanders away from the receiver aperture due to the effects of atmospheric turbulence. The impacts of laser beam diverging angles on channel fading probability density function (pdf) and on bit-error-rate (BER) performance of both uncoded and coded FSO communication systems are studied for different receiver aperture sizes and propagation distances. The optimal diverging angles are determined according to the average uncoded and coded BER for both uncoded and coded system, respectively. For a fast-tracked FSO communication system, a focused beam always provides better channel fading, coded BER, and uncoded BER than beams with larger diverging angles. For an untracked system, smaller beam diverging angels have better BER performance and lower channel fading for short distances when beam wander is small compared with the receiver aperture size, and larger beam diverging angles are preferred for longer distances when beam wander becomes significant. The optimal beam diverging angles of the coded FSO communication systems are smaller than those of the uncoded systems.

Published in:

Aerospace Conference, 2011 IEEE

Date of Conference:

5-12 March 2011