US 11,057,107 B2
Compact free space communication
Gerald Nykolak, Long Beach, NY (US); Andrew Russell Grant, Freehold, NJ (US); and David C. Nielsen, Bridgewater, NJ (US)
Assigned to CACI, INC. - FEDERAL, Arlington, VA (US)
Filed by CACI, Inc.—Federal, Arlington, VA (US)
Filed on Aug. 30, 2019, as Appl. No. 16/556,881.
Prior Publication US 2021/0067246 A1, Mar. 4, 2021
Int. Cl. H04B 10/00 (2013.01); H04B 10/11 (2013.01); H04B 10/69 (2013.01); H04B 10/50 (2013.01); H04B 10/25 (2013.01)
CPC H04B 10/11 (2013.01) [H04B 10/25 (2013.01); H04B 10/505 (2013.01); H04B 10/691 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A device for free space optical communication comprising:
a laser;
a modulator configured to cause the laser to output an optical signal comprising a data signal and a beacon signal;
a defocuser optically coupled to the laser and configured to receive the optical signal and control a beam divergence of the optical signal;
an optical interface configured to receive the optical signal from the defocuser and output the optical signal into free space;
a controller configured to cause the defocuser to adjust the beam divergence to a first beam divergence for a first operational mode and a second beam divergence for a second operational mode, wherein the first operational mode comprises a communication mode and the second operational mode comprises one or more of a tracking mode or a link acquisition mode; and
a zoom element configured to receive at least a portion of an additional optical signal received from free space via the optical interface and control a beam divergence of the at least a portion of the additional optical signal upon a spatial detector configured for determining positioning information.