Mitigation of atmospheric-turbulence effects over 2.4-km near-horizontal propagation path with 134 control-channel MEMS/VLSI adaptive transceiver system

Details Mitigation of atmospheric-turbulence effects over 2.4-km near-horizontal propagation path with 134 control-channel MEMS/VLSI adaptive transceiver system Mitigation of atmospheric-turbulence effects over 2.4-km near-horizontal propagation path with 134 control-channel MEMS/VLSI adaptive transceiver system

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.5162....1w&link_type=abstract

Advanced Wavefront Control: Methods, Devices, and Applications. Edited by Gonglewski, John D.; Vorontsov, Mikhail A.; Gruneisen

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We present the results from experimental mitigation of wavefront distortions induced by atmospheric turbulence within a 2.4 km near horizontal propagation path using an adaptive optics system based on a model-free optimization strategy. A laser source with a diffuser or a multi-mode fiber-coupled laser were used to model a partially coherent speckle beacon. Propagation path characteristics (intensity scintillations and Strehl ratio fluctuations) were determined for different turbulence conditions. The adaptive optics system comprises a micro-electromechanical mirror and a VLSI controller that implements a stochastic parallel gradient descent (SPGD) algorithm for the optimization process. Experiments performed in an adaptive receiver as well as in an adaptive transceiver configuration demonstrate improvement of the average Strehl ratio even under strong scintillation conditions.

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