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A numerical simulation and an experiment on adaptive optics (AO) in 2.5Gbps laser communication system are introduced in this paper. The simulation results show that the signal fading is mitigated at a large part with AO correction. The experiment results show that the average bit-error-rate (BER) is 6×10−3 without AO correction. The average BER will be reduced to 1×10−4 with AO tip-tilt correction...