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Optical Fiber Communication Conference

Coexistence of Commercial CV-QKD in FOADM-based Metro Networks with Full or Partial C-Band Utilization

Antonio Melgar, Masab Iqbal, Michela Svaluto Moreolo, José Manuel Rivas-Moscoso, Jeison Tabares, Pablo Armingol Robles, Borja Villanueva, S. Etcheverry, Jesús Folgueira

Published Jan 1, 2025• 5 citations
Publisher

Abstract

We assess the feasibility of deploying a commercial CV-QKD system over a 20 km amplified FOADM-based metro link, evaluating coexistence in both full and partial C-Band occupancy. Frequency allocation guidelines optimizing the performance of CV-QKD and classical channels are provided based on experiments and simulations. © 2025 The Author(s)

DOI
10.1364/ofc.2025.tu3d.4

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arXiv:1412.1403•New Journal of Physics•Apr 15, 2015•221 citations
We assess the feasibility of deploying a commercial CV-QKD system over a 20 km amplified FOADM-based metro link, evaluating coexistence in both full and partial C-Band occupancy. Frequency allocation guidelines optimizing the performance of CV-QKD and classical channels are provided based on experiments and simulations. © 2025 The Author(s)
We demonstrate experimentally the feasibility of continuous variable quantum key distribution (CV-QKD) in dense-wavelength-division multiplexing networks (DWDM), where QKD will typically have to coexist with several co-propagating (forward or backward) C-band classical channels whose launch power is around 0 dBm. We have conducted experimental tests of the coexistence of CV-QKD multiplexed with an intense classical channel, for different input powers and different DWDM wavelengths. Over a 25 km fiber, a CV-QKD operated over the 1530.12 nm channel can tolerate the noise arising from up to 11.5 dBm classical channel at 1550.12 nm in the forward direction (9.7 dBm in backward). A positive key rate (0.49 kbits s −1 ) can be obtained at 75 km with classical channel power of respectively −3 and −9 dBm in forward and backward. Based on these measurements, we have also simulated the excess noise and optimized channel allocation for the integration of CV-QKD in some access networks. We have, for example, shown that CV-QKD could coexist with five pairs of channels (with nominal input powers: 2 dBm forward and 1 dBm backward) over a 25 km WDM-PON network. The obtained results demonstrate the outstanding capacity of CV-QKD to coexist with classical signals of realistic intensity in optical networks.