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OptoElectronics and Communications Conference and International Conference on Photonics in Switching and Computing (OECC/PSC)

WDM Transmission of Y-00 Cipher Signals for High Capacity Secure Optical Fiber Networks

Fumio Futami, Osamu Hirota

Published Jan 1, 2013• 0 citations
Publisher

Abstract

Transmission capacity of Y-00 cipher increases by wavelength division multiplexing (WDM) technique since Y-00 signals require no excess bandwidth. 10 channel WDM transmission each channel carrying 2.5-Gb/s Y-00 signals over 120 km was successfully demonstrated.
DOI
10.1364/oecc_ps.2013.tup1_1

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Y-00 quantum stream cipher is a signal-level encryption technique that prevents signal interception in optical fiber communications. Security of the Y-00 cipher depends on the signal power, and thus the cipher system has a tradeoff between the security and signal quality. This letter reports theoretical analysis of Nyquist wavelength-division multiplexed transmission of phase-shift keying Y-00 cipher over a nonlinear fiber channel. A tradeoff formula between reach and signal security is derived utilizing the Gaussian noise model. Numerical study shows that the PSK Y-00 cipher achieves high-capacity ultra-long-haul transmission with a countermeasure against interception.
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