A free-space optical terminal for fading channels

T. Williams, R. J. Murphy, F. Walther, A. Volpicelli, B. Wilcox, D. Crucioli, Arun K. Majumdar, Christopher C. Davis
2009 Free-Space Laser Communications IX  
This paper describes a lasercom terminal using spatial diversity to mitigate fading caused by atmospheric scintillation. Multiple receive apertures are separated sufficiently to capture statistically independent samples of the incoming beam. The received optical signals are tracked individually, photo-detected, and summed electrically, with measured diversity gain. The terminal consists of COTS components. It was used in successful demonstrations over a 5.4km ground-ground link from June
more » ... nk from June through September 2008, during which it experienced a wide temperature range. Design overview and hardware realization are presented.
doi:10.1117/12.826285 fatcat:mvo2ucnywnaq5ki4zfngxnzwxa