CPC H04B 10/112 (2013.01) [H04L 9/001 (2013.01); H04L 9/0852 (2013.01); H04L 9/12 (2013.01)] | 11 Claims |
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.
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