First industrial-grade coherent fiber link for optical frequency standard dissemination
F. Guillou-Camargo, V. M\'enoret, E. Cantin, O. Lopez, N. Quintin, E., Camisard, V. Salmon, J.-M. Le Merdy, G. Santarelli, A. Amy-Klein, P.-E., Pottie, B. Desruelle, C. Chardonnet

TL;DR
This paper demonstrates the first industrial-grade, bi-directional 680 km fiber link for optical frequency standard dissemination, achieving high stability and accuracy suitable for scientific and metrological applications.
Contribution
It presents the design, implementation, and characterization of an industrial, long-distance fiber link for precise optical frequency transfer, a first in France.
Findings
Short-term stability of 5.4×10⁻¹⁶ at 1s
Long-term stability of 1.7×10⁻²⁰ at 65,000s
Frequency transfer accuracy of 3×10⁻²⁰
Abstract
We report on a fully bi-directional 680~km fiber link connecting two cities for which the equipment, the set up and the characterization are managed for the first time by an industrial consortium. The link uses an active telecommunication fiber network with parallel data traffic and is equipped with three repeater laser stations and four remote double bi-directional Erbium-doped fiber amplifiers. We report a short term stability at 1~s integration time of in 0.5~Hz bandwidth and a long term stability of at 65\,000 s of integration time. The accuracy of the frequency transfer is evaluated as . No shift is observed within the statistical uncertainty. We show a continuous operation over 5 days with an uptime of 99.93. This performance is comparable with the state of the art coherent links established between National Metrology…
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