Abstract:
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We analyze the performance of adaptive field
conjugation array receivers in coherent laser communications through the turbulent atmosphere. We consider coherent fiber
arrays consisting of densely packed multiple subapertures,with each subaperture interfaced to a single-mode fiber. In
a field conjugation fiber array, the single-mode fiber outputs are detected, and the photocurrents are adaptively co-phased
and scaled, and then summed to mitigate signal fading associated with atmospheric turbulence and compensate for
imperfect fiber coupling efficiency. We quantify how field conjugation processing improves performance in the presence
of turbulence, as compared to a monolithic-aperture coherent receiver having an equal total cross-sectional area. |