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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 37, Iss. 21 — Jul. 20, 1998
  • pp: 4782–4788

Experimental verification and theory for an eight-element multiple-aperture equal-gain coherent laser receiver for laser communications

Arthur R. Weeks, Jing Xu, Ronald R. Phillips, Larry C. Andrews, C. Martin Stickley, Glenn Sellar, John S. Stryjewski, and James E. Harvey  »View Author Affiliations


Applied Optics, Vol. 37, Issue 21, pp. 4782-4788 (1998)
http://dx.doi.org/10.1364/AO.37.004782


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Abstract

The detection and processing of laser communication signals are affected by the fading induced onto these signals by atmospheric turbulence. One method of reducing this fading is to use an array of detectors in which each of the detector outputs are added together coherently. We present experimental verification and theory of a 1.06 μm eight-element coherent receiver used to mitigate the effects of fading over a 1-km outdoor range. The carrier-to-noise ratio (CNR) was measured on a single channel and was then compared with the CNR obtained from the coherent sum of the eight channels. The increase of the mean CNR for the coherent sum as compared with a single aperture was observed proportional to the number of the apertures under different conditions of atmospheric turbulence. The measured mean CNR gain fitted the theoretical prediction well when the laser intensity fluctuations followed the gamma distribution.

© 1998 Optical Society of America

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(280.1310) Remote sensing and sensors : Atmospheric scattering
(280.3640) Remote sensing and sensors : Lidar
(280.5600) Remote sensing and sensors : Radar

History
Original Manuscript: September 10, 1997
Revised Manuscript: April 10, 1998
Published: July 20, 1998

Citation
Arthur R. Weeks, Jing Xu, Ronald R. Phillips, Larry C. Andrews, C. Martin Stickley, Glenn Sellar, John S. Stryjewski, and James E. Harvey, "Experimental verification and theory for an eight-element multiple-aperture equal-gain coherent laser receiver for laser communications," Appl. Opt. 37, 4782-4788 (1998)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-37-21-4782

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