First Demonstration of 25λ × 10 Gb/s C+L Band Classical / DV-QKD Co-Existence Over Single Bidirectional Fiber Link

Honz, Florian; Prawits, Florian; Alia, Obada; Sakr, Hesham; Bradley, Thomas D.; Zhang, Cong; Slavı́k, Radan; Poletti, F.; Kanellos, George T.; Nejabati, Reza; Walther, Philip; Simeonidou, Dimitra; Hübel, Hannes; Schrenk, Bernhard

doi:10.1109/jlt.2023.3256352

Cited by 11 publications

(1 citation statement)

References 40 publications

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“…That is why the co-propagation, on the same fiber, of the quantum channel and existing WDM channels is of utmost importance. This co-propagation often reduces the Secure Key Rate (SKR) which is particularly sensitive to the length of the transmission link, through an increased Quantum Bit Error Ratio (QBER), principally due to spontaneous Raman scattering [2], [3] of co-propagating light.…”

Section: Introductionmentioning

confidence: 99%

Co-Propagation of QKD & 6 Tb/s (60 × 100G) DWDM Channels With ∼17 dBm Total WDM Power in Single and Multi-Span Configurations

Gavignet,

Pincemin,

Herviou

et al. 2024

J. Lightwave Technol.

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We report co-propagation experiments of the quantum channel (at 1310 nm) of a Quantum Key Distribution (QKD) system with Dense Wavelength Division Multiplexing (DWDM) data channels in the 1550 nm range. Two configurations are assessed. The first one is a single span configuration where various lengths of Standard Single Mode Fiber (SSMF) (from 20 to 70 km) are used and the total WDM channels power is varied. The Secure Key Rate (SKR) and the Quantum Bit Error Ratio (QBER) are recorded showing that up to ~17 dBm total power of 30 or 60 channels at 100 Gb/s can coexist with the quantum channel. A metric to evaluate the co-propagation efficiency is also proposed to better evaluate the ability of a QKD system to provide secure keys in a co-propagation regime. The second experiment is a three spans link with a cascade of three QKD systems and two trusted nodes in a 184 km total link length. We report the transmission of a coherent 400 Gb/s Dual Polarization DP-16QAM (Quadrature Amplitude Modulation) channel that transports a QKD secured 100 GbE data stream, with other fifty-four 100 Gb/s WDM channels. Encryption is demonstrated at the same time as co-propagation.

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Section: Introductionmentioning

confidence: 99%

Co-Propagation of QKD & 6 Tb/s (60 × 100G) DWDM Channels With ∼17 dBm Total WDM Power in Single and Multi-Span Configurations

Gavignet,

Pincemin,

Herviou

et al. 2024

J. Lightwave Technol.

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Microstructured optical fibers for quantum applications: Perspective

McGarry,

Harrington,

Davis

et al. 2024

APL Quantum

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Recent progress in the development and applications of microstructured optical fibers for quantum technologies is summarized. The optical nonlinearity of solid-core and gas-filled hollow-core fibers provides a valuable medium for the generation of quantum resource states as well as for quantum frequency conversion between the operating wavelengths of existing quantum photonic material architectures. The low loss, low latency, and low dispersion of hollow-core fibers make these fibers particularly attractive for both short- and long-distance links in quantum networks. Hollow-core fibers also promise to replace free-space optical components in a wide range of atomic experiments.

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