Physikalisch-Technische Bundesanstalt, Braunschweig, Germany.
IEEE Trans Ultrason Ferroelectr Freq Control. 2010 Jan;57(1):175-81. doi: 10.1109/TUFFC.2010.1395.
We have explored the performance of 2 "dark fibers" of a commercial telecommunication fiber link for a remote comparison of optical clocks. These fibers establish a network in Germany that will eventually link optical frequency standards at PTB with those at the Institute of Quantum Optics (IQ) at the Leibniz University of Hanover, and the Max Planck Institutes in Erlangen (MPL) and Garching (MPQ). We demonstrate for the first time that within several minutes a phase coherent comparison of clock lasers at the few 10(-15) level can also be accomplished when the lasers are more than 100 km apart. Based on the performance of the fiber link to the IQ, we estimate the expected stability for the link from PTB to MPQ via MPL that bridges a distance of approximately 900 km.
我们探索了商业电信光纤链路的两条“暗光纤”的性能，以实现远程光学时钟比较。这些光纤在德国建立了一个网络，最终将德国联邦物理技术研究院（PTB）的光学频率标准与汉诺威莱布尼兹大学（汉诺威大学）的量子光学研究所（IQ）以及埃尔兰根（MPL）和加兴（MPQ）的马克斯·普朗克研究所的光学频率标准连接起来。我们首次证明，当激光相隔超过 100 公里时，在几分钟内也可以实现时钟激光在数 10(-15) 水平的相干比较。根据到 IQ 的光纤链路的性能，我们估计了通过 MPL 连接到 MPQ 的 PTB 链路的预期稳定性，MPL 连接的距离约为 900 公里。
