Patent 7941050 was granted and assigned to Battelle Memorial Institute on May, 2011 by the United States Patent and Trademark Office.
Free space optical communication methods and systems, according to various aspects are described. The methods and systems are characterized by transmission of data through free space with a digitized optical signal acquired using wavelength modulation, and by discrimination between bit states in the digitized optical signal using a spectroscopic absorption feature of a chemical substance.