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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 41, Iss. 36 — Dec. 20, 2002
  • pp: 7592–7602

Minimization of acquisition time in short-range free-space optical communication

Jin Wang, Joseph M. Kahn, and Kam Y. Lau  »View Author Affiliations


Applied Optics, Vol. 41, Issue 36, pp. 7592-7602 (2002)
http://dx.doi.org/10.1364/AO.41.007592


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Abstract

We consider short-range (1–3-km) free-space optical communication between moving parties when covertness is the overriding system performance requirement. To maximize covertness, it is critical to minimize the time required for the acquisition phase, during which the party initiating contact must conduct a broad-field scan and so risks revealing his position. Assuming an elliptical Gaussian beam profile, we show how to optimize the beam divergence angles, scan speed, and design of the raster scan pattern so as to minimize acquisition time. In this optimization, several constraints are considered, including: signal-to-noise ratio, required for accurate bearing detection and reliable decoding; limited receiver bandwidth; limited scanner speed; and beam divergence as limited by the scanner mirror dimensions. The effects of atmospheric turbulence are also discussed.

© 2002 Optical Society of America

OCIS Codes
(040.1240) Detectors : Arrays
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.4510) Fiber optics and optical communications : Optical communications
(120.5800) Instrumentation, measurement, and metrology : Scanners
(140.3300) Lasers and laser optics : Laser beam shaping

Citation
Jin Wang, Joseph M. Kahn, and Kam Y. Lau, "Minimization of acquisition time in short-range free-space optical communication," Appl. Opt. 41, 7592-7602 (2002)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-36-7592


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