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Multimode receivers based on spatial or modal diversity are promisingarchitectures to mitigate in real time the atmospheric turbulence effects forfree space optical (FSO) communications. In this paper, we evaluate and commenton the dynamical communication performances of a FSO mode diversity receiver,based on a spatial demultiplexer and a silicon photonic coherent combiner, foran optical link from a GEO satellite to an optical ground station (OGS). Wesimulate time series of distorted wavefronts received by the OGS and we shownumerically that the coherent combination of spatial modes mitigate the signalfading compared to a conventional single mode fiber (SMF) receiver. We verifythis property in a laboratory environment by generating the wavefrontscorresponding to the use case with an atmospheric propagation channel emulator.Then we modulate the optical carrier prior to the wavefront emulator with 10GOOK and DPSK data sequences to measure the BER performance of the proposedreceiver during the time series emulation. Finally, we study and comment on theinfluence of the number of modes combined and the wavelength multiplexing onthe BER performances. We prove that the mode diversity receiver provide ahigher collection efficiency, has better BER performances and much lesssynchronization losses.

Evaluation of a multimode receiver with a photonic integrated combiner for satellite to ground optical communications