A pair of fiber links between NIM and Measurement and Test Center of Aerospace System Department (MTC) are realized by welding the dark fibers in the communication network. A new device with integrated fiber optics and electrics is used to transfer the standard frequency signal via the fiber links. Here we show the main modifications of this device comparing to the old version. By short connecting the end of the fiber links at MTC, a double length fiber link is used to the test the transfer stability of the device. With an 83-days standard frequency transfer measurement, the Allan deviations show the transfer stability is better than 1E-14@1s and 7E-18@1day. This result indicates the new designed device is suit for the hydrogen masers comparison between NIM and MTC.
Two strontium optical lattice clocks (Sr1 and Sr2) are being built at National Institute of Metrology(NIM) of China. Sr1 was firstly evaluated in 2015, and later equipped with a new clock laser based on a 30 cm reference cavity, which helped to improve its stability. Sr2 is built on a new campus of NIM, which has some different designs compared to Sr1, for example, a permanent magnets based Zeeman slower, a differential pumping stage, and a robust laser system. A time interleaved self-comparison campaign of Sr2 of more than 7 days shows an up-time of ~90% and a measurement stability of 3.7×10-15/√𝜏 with a 10 cm ULE cavity based clock laser. The link between these two optical clocks, that consists of two fiber optical frequency combs and a 54 km fiber connection, are being constructed. The comparison of these two clocks is planned in the near future.
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