Atmospheric factors 1 Atmospheric turbulence 1 Background noise 1 Cadmium alloys 1 Gallium alloys 1 Ground stations 1 II-VI semiconductors 1 Indium alloys 1 Information exchanges 1 Information signals 1 Infrared devices 1 Infrared regions 1 Mercury amalgams 1 Optical communication 1 Optical links 1 Optical space communication 1 Satellites 1 Semiconducting indium 1 Semiconducting indium gallium arsenide 1 Semiconductor alloys 1 Sky glow 1 Space 1 Transmitter frequencies air 1 communication 1 optical link 1 satellite 1 space 1