Method and device for suppressing signal fading in laser communication from ground to GEO (geosynchronous) satellite
A suppression device and laser communication technology, applied in the field of satellite laser communication, to achieve the effects of suppressing fast signal fading, suppressing the flicker of atmospheric turbulence intensity, and reducing the depth of fading
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[0026] An embodiment of suppressing the intensity fluctuation of the uplink laser beam by using the correlation between the intensity fluctuation of the downlink beacon light and the uplink laser beam intensity fluctuation is as follows figure 1 shown. Downlink beacon lasers from GEO (Geostationary Orbit) satellites pass through atmospheric turbulence and are transmitted by ground optical antennas (1-1) (diameter about 5 to 20 cm) to receive, the optical antenna (1-1) is a confocal optical system, and the downlink beacon light is still a parallel beam after passing through the optical antenna (1-1), but the beam diameter is compressed. Then after passing through the fast deflecting mirror (1-2), the beam splitter (1-3) and the lens (1-5), it is coupled into the single-mode fiber (1-6) on the rear focal plane of the lens (1-5). After passing through the wavelength division multiplexer (1-7), the beacon light is converted into an electrical signal by the photodetector (1-8),...
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