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Technical report of IEICE. OPE

A study on Y-00 cipher communication for high capacity by wavelength division multiplexing

Fumio Futami, Osamu Hirota

Published Oct 17, 2013• 0 citations
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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.
The quantum-classical coexistence can be implemented based on wavelength division multiplexing (WDM), but due to Raman noise, the wavelength spacing between quantum and classical signals and launch power from classical channels are restricted. Space division multiplexing (SDM) can now be availably achieved by multicore fiber (MCF) to reduce Raman noise, thereby loosening the restriction for coexistence in the same band and obtaining a high communication capacity. In this paper, we realize the quantum-classical coexistence over a 7-core MCF. Based on the SDM, the highest launch power of 25 dBm is achieved which has been extended nearly 19 times in previous work. Moreover, both the quantum and classical channels are allocated in the C-band and the minimum wavelength spacing between them is only 1.6 nm. The coexistence system eliminates the need for adding a narrowband filter.