Coexistence of discrete-variable QKD with WDM classical signals in the C-band for fiber access environments

Title
Coexistence of discrete-variable QKD with WDM classical signals in the C-band for fiber access environments

Authors
D. Zavitsanos, G. Giannoulis, A. Raptakis, C. Papananos, F. Setaki, E. Theodoropoulou, G. Lyberopoulos, Ch. Kouloumentas, and H. Avramopoulos.

Abstract
In this paper, a coexistence scheme between a Discrete-Variable Quantum Key Distribution (DV-QKD) and four bidirectional classical channels in a Passive Optical Network (PON) topology is theoretically investigated. The study aims to explore the imposed limitations considering the coexistence of weak quantum channels with realistic traffic flows of classical streams through shared fiber infrastructures. Based on a ‘plug and play’ phase coding DV-QKD implementation, we conducted numerical simulations of the QBER and the secure key rate for fiber distances up to 10km. The reported results suggest that in a fixed C-band grid, the spectral isolation between classical and quantum channels is essential at dense grids. By removing the leakage noise through stronger spectral isolation, the photons linked with the Raman scattering becomes the dominant noise source, since this mechanism covers an ultra-broadband window and gets stronger as the propagation distance increases.

Venue
21st International Conference on Transparent Optical Networks ICTON 2019 (http://www.icton2019.com/)

Place and Date
Angers, France, July 9-13, 2019