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Digital turbulence compensation of free space optical link with multimode optical amplifier
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2019
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Free-space Optical NetworkPhotonicsAdaptive OpticEngineeringOptical Transmission SystemOptical PropertiesDigital Turbulence CompensationMultimode Optical AmplifierLossless Adaptive OpticsOptical CommunicationOptical SystemsSignal ProcessingOptical NetworkingOptical AmplifierCoherent Superposition
We demonstrate digital turbulence compensation using a 12-spatial mode digital coherent receiver with a multimode preamplifier that provides a 6-dB sensitivity improvement. This combination acts similarly to ideal lossless adaptive optics. Coherent superposition of 12 spatial-modes reduced median BER from 0.1 to 1×10-5 compared to traditional single-mode detection.