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Proceedings Paper

Optical communications receiver array
Author(s): Jonathan M. Saint Clair; Eric Y. Chan; Dennis G. Koshinz; Stephen K. Wilcken; David C. Soreide; Atul Joshi; Hakan Durmus
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Paper Abstract

One of the major challenges to free space laser communications and ladar is the impact of turbulence on beam propagation, one example of which is signal fading. These impacts can be exacerbated on airborne platforms by turbulence in the vicinity of the laser system aperture and the platform wake. There are a number of strategies to mitigate this, including adaptive optics, active flow control, and various dimensions of diversity: wavelength, polarization, temporal, and spatial diversity. In this paper we will discuss spatial diversity implemented in the focal region of optical telescopes. We will briefly compare this with other methods, describe results of requirements analysis of array features and optical configurations for various atmospheric turbulence states, and suggest several attractive configurations. We will also report on the design and test of one configuration, implemented in a prototype, and tested for noise performance, optical transmission, modulation bandwidth, and BER performance with our dynamic turbulence simulator. Early evidence shows significant BER improvements of several orders of magnitude at high turbulence fluctuation frequencies using this technique.

Paper Details

Date Published: 4 May 2010
PDF: 10 pages
Proc. SPIE 7685, Atmospheric Propagation VII, 768507 (4 May 2010); doi: 10.1117/12.852564
Show Author Affiliations
Jonathan M. Saint Clair, The Boeing Co. (United States)
Eric Y. Chan, The Boeing Co. (United States)
Dennis G. Koshinz, The Boeing Co. (United States)
Stephen K. Wilcken, The Boeing Co. (United States)
David C. Soreide, Optimal Aerospace LLC (United States)
Atul Joshi, Teledyne Scientific Co. (United States)
Hakan Durmus, Teledyne Scientific Co. (United States)

Published in SPIE Proceedings Vol. 7685:
Atmospheric Propagation VII
Linda M. Wasiczko Thomas; Earl J. Spillar, Editor(s)

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