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Proceedings Paper

Experimental demonstration of multi-aperture digital coherent combining over a 3.2-km free-space link
Author(s): D. J. Geisler; T. M. Yarnall; C. M. Schieler; M. L. Stevens; B. S. Robinson; S. A. Hamilton
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Paper Abstract

The next generation free-space optical communications infrastructure will need to support a wide variety of space-to-ground links. As a result of the limited size, weight, and power on space-borne assets, the ground terminals need to scale efficiently to large collection areas to support extremely long link distances or high data rates. Recent advances in integrated digital coherent receivers enable the coherent combining (i.e., full-field addition) of signals from several small apertures to synthesize an effective single large aperture. In this work, we experimentally demonstrate the coherent combining of signals received by four independent receive chains after propagation through a 3:2-km atmospheric channel. Measured results show the practicality of coherently combining the four received signals via digital signal processing after transmission through a turbulent atmosphere. In particular, near-lossless combining is demonstrated using the technique of maximal ratio combining.

Paper Details

Date Published: 24 February 2017
PDF: 8 pages
Proc. SPIE 10096, Free-Space Laser Communication and Atmospheric Propagation XXIX, 100960C (24 February 2017); doi: 10.1117/12.2256581
Show Author Affiliations
D. J. Geisler, MIT Lincoln Lab. (United States)
T. M. Yarnall, MIT Lincoln Lab. (United States)
C. M. Schieler, MIT Lincoln Lab. (United States)
M. L. Stevens, MIT Lincoln Lab. (United States)
B. S. Robinson, MIT Lincoln Lab. (United States)
S. A. Hamilton, MIT Lincoln Lab. (United States)

Published in SPIE Proceedings Vol. 10096:
Free-Space Laser Communication and Atmospheric Propagation XXIX
Hamid Hemmati; Don M. Boroson, Editor(s)

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