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Proceedings Paper

Experimental verification and theory of CNR gain for an eight-element multiple-aperture coherent laser receiver
Author(s): Arthur Robert Weeks; Ronald L. Phillips; Jing Xu; Kevin J. Gamble; Chie L. Gagge; K. Lewis; Giovanni Luvera; Ali Notash; Patrick L. Thompson; James E. Harvey; R. Glenn Sellar; C. Martin Stickley; Larry C. Andrews; Deborah E. Tjin-Tham-Sjin; John S. Stryjewski
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Paper Abstract

The detection and processing of laser communication signals are drastically 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. This requires measuring the phase difference between each of the receivers and co-phasing each of the detector outputs. This paper presents experimental verification at the Innovative Science and Technology Experimentation Facility over an outdoor range of a 1.06 micron eight element coherent receiver used to mitigate the effects of fading. The system is composed of a 60 mw Nd:Yag laser used as the transmitter and a 27 MHz AO modulator used to frequency shift the transmitted beam. The receiver is composed of eight 1 cm lenses launching the eight received optical signals into eight signal mode optical fibers. Phase compensation between each of the eight receivers is accomplished using single mode fibers wrapped around PZT cylinders that are controlled by phase compensating electronics. The carrier-to-noise (CNR) ratio was measured on a single channel and was then compared with the CNR obtained from the coherent sum of the eight channels. The improvement of the CNR for the coherent sum as compared to a single channel was then compared against theoretical predictions.

Paper Details

Date Published: 6 August 1997
PDF: 9 pages
Proc. SPIE 3065, Laser Radar Technology and Applications II, (6 August 1997); doi: 10.1117/12.280997
Show Author Affiliations
Arthur Robert Weeks, CREOL/Univ. of Central Florida (United States)
Ronald L. Phillips, CREOL/Univ. of Central Florida (United States)
Jing Xu, CREOL/Univ. of Central Florida (United States)
Kevin J. Gamble, CREOL/Univ. of Central Florida (United States)
Chie L. Gagge, CREOL/Univ. of Central Florida (United States)
K. Lewis, CREOL/Univ. of Central Florida (United States)
Giovanni Luvera, CREOL/Univ. of Central Florida (United States)
Ali Notash, CREOL/Univ. of Central Florida (United States)
Patrick L. Thompson, CREOL/Univ. of Central Florida (United States)
James E. Harvey, CREOL/Univ. of Central Florida (United States)
R. Glenn Sellar, CREOL/Univ. of Central Florida (United States)
C. Martin Stickley, CREOL/Univ. of Central Florida (United States)
Larry C. Andrews, CREOL/Univ. of Central Florida (United States)
Deborah E. Tjin-Tham-Sjin, CREOL/Univ. of Central Florida (United States)
John S. Stryjewski, Nichols Research Corp. (United States)


Published in SPIE Proceedings Vol. 3065:
Laser Radar Technology and Applications II
Gary W. Kamerman, Editor(s)

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