首个用于光频标传播的工业级相干光纤链路
First industrial-grade coherent fiber link for optical frequency standard dissemination
摘要：
我们报告了一个完全双向的680公里的光纤链路连接两个城市的设备，设置和表征管理的第一次由一个工业财团。该链路使用具有并行数据流量的有源电信光纤网络，并配备有三个中继激光站和四个远程双双向掺铒光纤放大器。我们报道了$5.4\times 10^{-16}$在0.5~Hz带宽内1~s积分时间的短期稳定性和$1.7\times10^{-20}$在65\,000 s积分时间的长期稳定性。频率转换的精度被评估为$3\times 10^{-20}$。在统计不确定度范围内未观察到变化。我们显示连续手术超过5天，平均值为99.93 $\%$。这一性能可与欧洲国家计量机构之间建立的最先进的连贯链路相媲美。这是法国计量光纤网络建设的第一步，将为广大科学用户提供超高性能频率标准。
英文摘要：
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 $5.4\times 10^{-16}$ in 0.5~Hz bandwidth and a long term stability of $1.7\times10^{-20}$ at 65\,000 s of integration time. The accuracy of the frequency transfer is evaluated as $3\times 10^{-20}$. 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 Institutes in Europe. It is a first step in the construction of an optical fiber network for metrology in France, which will give access to an ultra-high performance frequency standard to a wide community of scientific users.
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