FIELD: optical communication systems; infrared-range digital communication systems. SUBSTANCE: system has main optical transmission channel with light-emitting diode; optical receiving channel, light-emitting diode and photodiode detector being coupled with converter; auxiliary optical transmitting channel with lasing emitter; lasing emitter on/off unit; received signal level evaluating unit. EFFECT: enhanced probability of guaranteed communications under severe weather conditions; reduced maintenance charges of system. 12 cl, 3 dwg
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