Abstract
We propose a perfect secrecy optical communication with an anti-correlated noise between wavelength-division-multiplexed (WDM) channels. The anti-correlated noise carries confidential information. By sending the different WDM channels to different communication paths in optical communication networks (wired and/or wireless), the achievable signal-to-noise ratio for eavesdroppers can be restricted to much less than that of a target receiver. We demonstrate a perfect secrecy optical network with a three-channel anti-correlated noise generated by using a Fabry–Perot laser diode and a broadband light source. The secure data-rate of 3.95-Gb/s was achieved against an eavesdropper on a single path. We also investigate a secrecy capacity as a function of the number of eavesdropped paths. Finally, security enhancement methods for the proposed system are introduced.
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