US 12,119,871 B1
Reducing scintillation noise in free space optical communications
Thomas M. Chaffee, Lexington, VA (US); Wayne H. Knox, Rochester, NY (US); Alexander B. LeBon, Lexington, VA (US); Brian M. Gregory, Lexington, VA (US); and Taz M. Colangelo, Lexington, VA (US)
Assigned to Attochron, LLC, Lexington, VA (US)
Filed by Attochron, LLC, Lexington, VA (US)
Filed on Jul. 3, 2024, as Appl. No. 18/763,291.
Application 18/763,291 is a continuation of application No. 18/583,825, filed on Feb. 21, 2024.
Application 18/583,825 is a continuation of application No. 18/355,398, filed on Jul. 19, 2023, granted, now 11,942,988, issued on Mar. 26, 2024.
Application 18/355,398 is a continuation of application No. 18/164,947, filed on Feb. 6, 2023, granted, now 11,757,529, issued on Sep. 12, 2023.
Application 18/164,947 is a continuation of application No. 17/932,364, filed on Sep. 15, 2022, granted, now 11,575,433, issued on Feb. 7, 2023.
Int. Cl. H04B 10/112 (2013.01)
CPC H04B 10/1123 (2013.01) [H04B 10/1129 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A ranging system, the ranging system comprising:
an optical source configured to generate a series of light pulses;
a modulator configured to modulate the series of light pulses to generate a modulated series of light pulses;
a photoreceiver, the photoreceiver having a detection window duration,
wherein:
the modulated series of light pulses comprises a first pulse;
photons of the first pulse arrive at the photoreceiver, after traveling through a variably refractive medium, according to a temporal distribution curve;
a full-width-at-half-maximum value (FWHM value) of the temporal distribution curve is greater than a coherence time value equal to a coherence length of the first pulse divided by a speed of light through the variably refractive medium; and
the ranging system is configured to determine a time of flight based on the photons received at the photoreceiver.