IET conference proceedings.

Time-interleaving enabled co-propagation of QKD with a 10-dBm 100-Gb/s QPSK channel over 100-km fiber

Jing Wang, Brian J. Rollick, Z. Jia, Han Zhang, Bernardo A. Huberman

Published Nov 13, 2023• 2 citations

Abstract

By time-interleaving QKD pulses into gaps between classical data frames, we experimentally demonstrate the C-band co-propagation of a polarization-encoding decoy-state BB84 QKD channel and a 10-dBm 100 Gb/s QPSK channel over 100-km fiber with minimum Raman noise interference.

DOI: 10.1049/icp.2023.2279

Related papers

Time-Interleaved C-Band Co-Propagation of Quantum and Classical Channels

Jing Wang, Brian J. Rollick, Zhensheng Jia +1 more

A successful commercial deployment of quantum key distribution (QKD) technologies requires integrating QKD links into existing fibers and sharing the same fiber networks with classical data traffic. To mitigate the spontaneous Raman scattering (SpRS) noise from classical data channels, several quantum/classical coexistence strategies have been developed. O-band solutions place the QKD channel in the O-band for lower SpRS noise but with the penalty of higher fiber loss and can rarely reach beyond 80 km of fiber; another method is C-band coexistence with attenuated classical channels, which sacrifices the performance of classical channels for lower SpRS noise. In this work, a time-interleaving technique is demonstrated to enable the co- propagation of quantum and classical channels in the C-band without sacrificing either performance. By embedding QKD pulses in the gaps between classical data frames, the quantum channel is isolated from SpRS noise in both wavelength and time domains. C-band co- propagation of a polarization-encoding decoy-state BB84 QKD channel with a 100 Gb/s QPSK channel is experimentally demonstrated with quantum bit error rate (QBER) of 1.12%, 2.04%, and 3.81% and secure key rates (SKR) of 39.5 kb/s, 6.35 kb/s, and 128 b/s over 20, 50, and 100 km fibers, respectively. These results were achieved with the presence of classical launch power up to 10 dBm, which is at least one order of magnitude higher than reported works. We also demonstrated the co- propagation of a QKD channel with eight classical channels with total launch power up to 18-dBm (9-dBm per channel), which is the highest power of classical channels reported in C-band coexistence works.

arXiv:2304.13828Journal of Lightwave TechnologyMar 26, 202433 citations

Co-propagation of 6 Tb/s (60*100Gb/s) DWDM & QKD channels with ~17 dBm aggregated WDM power over 50 km standard single mode fiber

Paulette Gavignet, François Mondain, Erwan Pincemin +5 more

We report the co-propagation, over 50 km of SSMF, of the quantum channel (1310 nm) of a QKD system with ~17 dBm total power of DWDM data channels (1550 nm range). A metric to evaluate Co-propagation Efficiency is proposed.

arXiv:2305.13742May 23, 20232 citations

Integration of Quantum Key Distribution in a 20-km 32-user Coherent Passive Optical Network with Single Feeder Fiber

Jing Wang, Brian J. Rollick, Zhensheng Jia +1 more

For the first time, we demonstrated the integration of O-band polarization-encoding decoy-state BB84 QKD into a C-band 20-km single-feeder fiber 32-user coherent PON running at carrier-grade power levels without modifying existing PON infrastructures.

arXiv:2412.16104Optical Fiber Communication ConferenceJan 1, 20250 citations

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

Paulette Gavignet, Erwan Pincemin, Fabrice Herviou +14 more

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.

arXiv:2312.11924Journal of Lightwave TechnologyOct 16, 202323 citations

Co-propagation of 6 Tb/s (60*100Gb/s) DWDM & QKD channels with ~17 dBm aggregated WDM power over 50 km Standard Single Mode Fiber

Paulette Gavignet, François Mondain, Erwan Pincemin +5 more

We report the co-propagation, over 50km of SSMF, of the quantum channel (1310nm) of a QKD system with ~17dBm total power of DWDM data channels (1550nm range). A metric to evaluate Co-propagation Efficiency is proposed.

Optical Fiber Communication ConferenceMar 1, 20230 citations

Co-propagation of 6 Tb/s (60* 100Gb/s) DWDM & QKD channels with ~17 dBm aggregated WDM power over 50 km Standard Single Mode Fiber

Paulette Gavignet, François Mondain, Erwan Pincemin +5 more

We report the co-propagation, over 50km of SSMF, of the quantum channel (1310nm) of a QKD system with ~17dBm total power of DWDM data channels (1550nm range). A metric to evaluate Co-propagation Efficiency is proposed.

Optical Fiber Communication ConferenceJan 1, 202314 citations