US 12,457,037 B1
Radio frequency signal transmission using free space optical communications
Thomas M. Chaffee, Lexington, VA (US); and Wayne H. Knox, Rochester, NY (US)
Assigned to Attochron, LLC, Lexington, VA (US)
Filed by Attochron, LLC, Lexington, VA (US)
Filed on Feb. 26, 2025, as Appl. No. 19/064,370.
Application 19/064,370 is a continuation of application No. 18/811,592, filed on Aug. 21, 2024, granted, now 12,244,341.
Application 18/811,592 is a continuation in part of application No. 18/644,752, filed on Apr. 24, 2024, granted, now 12,119,875, issued on Oct. 15, 2024.
This patent is subject to a terminal disclaimer.
Int. Cl. H04B 10/11 (2013.01); H01S 3/067 (2006.01); H04B 10/516 (2013.01); H04B 10/61 (2013.01)
CPC H04B 10/11 (2013.01) [H04B 10/5161 (2013.01); H04B 10/615 (2013.01); H01S 3/06716 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A receiver system of a free space optical communication system for receiving optically transmitted data through a variably refractive medium, the receiver system comprising:
a photoreceiver configured to receive a first amplified beam of light and a second amplified beam of light and configured to:
extract a first processed transmitted signal from the first amplified beam of light after the first amplified beam of light was transmitted through a variably refractive medium; and
extract a second processed transmitted signal from the second amplified beam of light after the second amplified beam of light was transmitted through the variably refractive medium;
a correction unit configured to:
correct first distortion in the first processed transmitted signal created during transmission of the first amplified beam of light through the variably refractive medium, thereby producing a first corrected signal; and
correct second distortion in the second processed transmitted signal created during transmission of the second amplified beam of light through the variably refractive medium, thereby producing a second corrected signal;
a combiner configured to combine the first corrected signal and the second corrected signal into a combined signal;
a radio frequency local oscillator configured to generate a radio frequency signal;
a mixer configured to receive the combined signal and the radio frequency signal, and multiply the combined signal by the radio frequency signal to produce a multiplied signal;
an amplifier configured to amplify the multiplied signal to produce an amplified multiplied signal; and
an antenna configured to emit the amplified multiplied signal,
wherein the correction unit uses threshold detection to correct the first distortion and the second distortion in the first processed transmitted signal and the second processed transmitted signal.