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Atmospheric turbulences can generate scintillation or beam wanderingphenomena that impairs free space optical (FSO) communication. In this paper,we propose and demonstrate a proof-of-concept FSO communication receiver basedon a spatial demultiplexer and a photonic integrated circuit coherent combiner.The system collects the light from several Hermite Gauss spatial modes andcoherently combine on chip the energy from the different modes into a singleoutput. The FSO receiver is characterized with a wavefront emulator bench thatgenerates arbitrary phase and intensity patterns. The multimode receiverpresents a strong resilience to wavefront distortions, compared to a monomodeFSO receiver. The system is then used to detect a modulation of the opticalbeam through a random wavefront profile.

Free space optical communication receiver based on a spatial demultiplexer and a photonic integrated coherent combining circuit