US 12,068,781 B2
System and method for secured free space optical transmission in the mid-infrared domain
Frédéric Grillot, Versailles (FR); and Olivier Spitz, Montrouge (FR)
Assigned to INSTITUT MINES TELECOM, Palaiseau (FR); and MIRSENSE, Palaiseau (FR)
Appl. No. 17/784,641
Filed by INSTITUT MINES TELECOM, Palaiseau (FR); and MIRSENSE, Palaiseau (FR)
PCT Filed Dec. 8, 2020, PCT No. PCT/EP2020/084986
§ 371(c)(1), (2) Date Jun. 11, 2022,
PCT Pub. No. WO2021/116060, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 19306650 (EP), filed on Dec. 13, 2019.
Prior Publication US 2023/0009914 A1, Jan. 12, 2023
Int. Cl. H04B 10/00 (2013.01); H04B 10/112 (2013.01); H04L 9/00 (2022.01); H04L 9/08 (2006.01); H04L 9/12 (2006.01)
CPC H04B 10/112 (2013.01) [H04L 9/001 (2013.01); H04L 9/0852 (2013.01); H04L 9/12 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A free-space optical communication system comprising a transmitter and a receiver, the transmitter being configured to transmit an encrypted message to the receiver at the mid-infrared domain, wherein:
the transmitter comprises a master mid-infrared optical source configured to generate a mid-infrared signal and a chaos generator configured to generate a chaotic signal by applying external optical feedback to said master mid-infrared optical source, said chaos generator comprising a feedback reflector and a mid-infrared polarizer, the transmitter being configured to determine an encrypted message from an original message by applying a message encryption technique to said original message and to send said encrypted message to said receiver through an optical isolator, the receiver comprising a slave mid-infrared optical source similar to said master mid-infrared optical source, said slave mid-infrared optical source being configured to recover the chaotic signal from the encrypted message by applying chaos synchronization, the receiver further comprising a first detector configured to detect the encrypted message, a second detector configured to detect the chaotic signal, and a message recovery unit configured to recover the original message from the encrypted message detected by said first detector and the chaotic signal detected by said second detector.