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IEICE Technical Report; IEICE Tech. Rep.

Transmission Experiment of 100-Gb/s Y-00 Quantum Stream Cipher using Wavelength-Division Multiplexing

Fumio Futami, Osamu Hirota

Published Nov 6, 2014• 0 citations
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•Jan 1, 2014•0 citations
We present the operation of a 1.5-Gb/s real-time Y-00 quantum stream cipher as an overlay in a modern coherent wavelength-division multiplexed (WDM) transmission system. We investigate transmission performance in two different wavelength allocation scenarios. The first scenario places the Y-00 cipher signal in a vacant 50-GHz channel slot between two 50-GHz spaced real-time processed 32-Gbaud PDM-16-QAM (256-Gbit/s) channels. The second scenario puts the Y-00 cipher signal in the small gap between two adjacent 50-GHz spaced WDM channels, hence implementing a secure channel overlay in a fully loaded WDM system. In both scenarios, the Y-00 cipher signal and the 256-Gbit/s signals are transmitted over 320 km.
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.