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.
Weiliang Chen, Huaiyan Chen, and Tao Yang, "Fiber-based frequency transfer between NIM and MTC," Proc. SPIE 11547, Optoelectronic Devices and Integration IX, 115471X (Presented at SPIE/COS Photonics Asia: October 14, 2020; Published: 10 October 2020); https://doi.org/10.1117/12.2584310.
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