Abstract
We propose a noninvasive optical encryption technique, taking advantage of the specificities of the physical
layer of a backbone transmission network, to secure optical transmissions at high data rates (> 10 Gb/s). Our goal is to secure data transmission without impacting the physical layer by guaranteeing the transparency of the encryption technique with respect to the
transmission equipment. The proposed method belongs to the optical code-division multiple-access technique using
spectral-phase encoding, based on pulse-overlapping sequence. The goal is to scale the protection levels to
different threat and attack scenarios and to make them resilient to intrusions and robust to fiber-propagation
parameters. In this paper, linear and nonlinear transmission effects (where self- and cross-phase modulations become
important) are considered to maintain the quality of transmission. Finally, particular attention is paid to the
ciphering key transmission for which we propose an adapted solution.
© 2007 IEEE
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