Modeling and Minimizing Spontaneous Raman Scattering for QKD Secured DWDM Networks
Journal article, 2021

Quantum key distribution (QKD) provides information-theoretic security based on quantum mechanics. Integrating QKD with classical data traffic by using wavelength division multiplexing (WDM) techniques in a single fibre is a cost-efficient way to improve security in legacy infrastructure. In such a system, the main noise source to the quantum channel is spontaneous Raman scattering (SRS) caused by the classical channels. In this letter we introduce a channel allocation strategy for both quantum and classical signals to minimize the SRS noise. A use case that quantum and classical channels co-exist in a dense WDM system is investigated. The results show >26% increase of achievable transmission distance for the QKD system when implementing the introduced channel allocation strategy. Moreover, a network updating plan is proposed, which provides a guideline to light the new wavelengths for classical communications while minimizing the SRS noise to quantum channels.

Quantum key distribution (QKD).

Optical fibre communication

optical communication network


Rui Lin

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks, Optical Networks

Jiajia Chen

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks, Optical Networks

IEEE Communications Letters

1089-7798 (ISSN)

Vol. In press 1-4

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Subject Categories


Communication Systems



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