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For some free-space laser communications (lasercom) links impacted by atmospheric-induced scintillation, the principle of reciprocity provides knowledge of a remote terminal's received intensity fluctuations based on measurements of the local terminal's received intensity fluctuations. We evaluate a reciprocity-enhanced technique using optical switching between multiple spatially-diverse transmit apertures to mitigate against atmospheric-induced scintillation. Experimental bit-error rate measurements are presented to quantify the expected performance of this approach in comparison to standard static diversity approaches. We investigate system constraints of this reciprocity-enhanced transmitter diversity approach, and identify candidate optical switches and digital logic for implementation.
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Jeffrey M. Roth, Alexander A. Knoedler, Ronald R. Parenti, Shankararaman Ramakrishnan, Jeffrey R. Minch, John D. Moores, "Reciprocity-enhanced transmitter diversity for lasercom," Proc. SPIE 11272, Free-Space Laser Communications XXXII, 1127209 (4 June 2020); https://doi.org/10.1117/12.2548463