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Proceedings Paper

Large area adaptive avalanche photodetector arrays for free-space optical communication
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Paper Abstract

In free space optical communication systems, atmospheric turbulence makes it very difficult to focus transmitted laser power onto small, low capacitance photodetectors. The obvious challenge, therefore, is to take advantage of larger area photodiodes without sacrificing a great deal of bandwidth and sensitivity in the process. In this work, we report on a high sensitivity, high speed adaptive avalanche photodetector array for free-space optical communication. The receiver consists of a 2×2 InGaAs APD array with each 100um element in the array having its own dedicated trans-impedance amplifier and buffering stage. The corresponding voltage outputs for each element are processed through a four channel digital, fast switching and summation circuit. The resulting signal is selectable to be either that of the element in the array with the greatest signal response or the sum of multiple or all channels. Design requirements, laboratory sensitivity measurements, and field testing results are presented.

Paper Details

Date Published: 19 August 2008
PDF: 10 pages
Proc. SPIE 7091, Free-Space Laser Communications VIII, 70910J (19 August 2008); doi: 10.1117/12.798915
Show Author Affiliations
Mike S. Ferraro, U.S. Naval Research Lab. (United States)
Wade T. Freeman, Smart Logic, Inc. (United States)
Rita Mahon, U.S. Naval Research Lab. (United States)
James L. Murphy, U.S. Naval Research Lab. (United States)
Peter G. Goetz, U.S. Naval Research Lab. (United States)
Michael Colbert, Smart Logic, Inc. (United States)
William S. Rabinovich, U.S. Naval Research Lab. (United States)
Harris R. Burris, U.S. Naval Research Lab. (United States)
Christopher I. Moore, U.S. Naval Research Lab. (United States)
William R. Clark, Optogration, Inc. (United States)
William D. Waters, Optogration, Inc. (United States)

Published in SPIE Proceedings Vol. 7091:
Free-Space Laser Communications VIII
Arun K. Majumdar; Christopher C. Davis, Editor(s)

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