Potential impact of CV-QKD integration on classical WDM network capacity

TL;DR

This paper explores how integrating continuous-variable quantum key distribution (CV-QKD) with classical WDM networks affects overall network capacity, highlighting the need for specialized planning due to Raman scattering limitations.

Contribution

It provides initial simulation results demonstrating the capacity trade-offs and the necessity for dedicated planning tools for mixed classical and CV-QKD networks.

Findings

CV-QKD integration can reduce classical network capacity due to Raman scattering.

Maximizing CV-QKD capacity impacts classical traffic negatively.

Dedicated planning heuristics are needed for optimal mixed network design.

Abstract

Continuous-variable quantum key distribution (CV-QKD) could allow QKD and classical optical signals physically sharing the same optical fibers in existing networks. However, Raman scattering imposes a limit on the optical power, which in turn impacts the network capacity for classical traffic in presence of CV-QKD. Network-planning simulations indicate that maxing out the CV-QKD capacity in an optical link can adversely impact its classical capacity. Although preliminary, these results show that designing a mixed classical and CV-QKD network will require dedicated planning heuristics and tools that specifically seek a compromise between classical and CV-QKD traffics.