Abstract—In this letter, we report on what we believe is the first demonstration of a cryptographic technique, based on optical chaos, applied to “real world” high-frequency signals. A standard TV signal at 2.4 GHz has been transmitted through an optical fiber link. The output from a chaotic laser, added to the signal at the transmitter side, strongly reduces its signal-to-noise ratio, and prevents an eavesdropper tapping the fiber from decoding the message. At the receiver side, the signal is extracted from chaos using a master–slave synchronization scheme. This requires a pair of lasers with strictly matched parameters, which represent the hardware cryptographic key of the method.
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