15 February 2018 FSO links using high sensitivity gigabit combinational sensors and an adaptive high-throughput error-correction protocol
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Abstract
For terrestrial free space optical (FSO) communication applications, large area photodetectors not only allow for more efficient power coupling but also ease the effects of atmospheric turbulence. When fabricated in array form, these devices have the added capability of operating as both data reception sensors and position sensitive detectors (PSD). Concentric five element impact ionization engineered (I2E) avalanche photodetector (APD) arrays have been developed to operate as combinational sensors at gigabit data rates. While the excellent sensitivity performance of these detectors allows for enhanced link range in calm atmospheric conditions, link availability with a high quality of service for an FSO system is strongly impacted by its ability to dynamically counter-act atmospheric fading with varying temporal scale. In this paper we present initial results using a combinational sensor in tandem with an advanced FSO modem which utilizes low-density parity check coding (LDPC) in an incremental redundancy (IR) hybrid automatic repeat request (HARQ) protocol. System performance enhancements as function of varying atmospheric scintillation will be discussed.
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Mike S. Ferraro, Rita Mahon, James L. Murphy, James L. Dexter, William S. Rabinovich, Linda M. Thomas, Christopher I. Moore, William R. Clark, William D. Waters, Kenneth Vaccaro, Ryan McCourt, "FSO links using high sensitivity gigabit combinational sensors and an adaptive high-throughput error-correction protocol", Proc. SPIE 10524, Free-Space Laser Communication and Atmospheric Propagation XXX, 1052408 (15 February 2018); doi: 10.1117/12.2290656; https://doi.org/10.1117/12.2290656
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