Evaluation at the Remote Site for Ultra-stable Radio Frequency   Dissemination via Fiber Links
  We demonstrate a method which can directly evaluate the radio frequency transfer quality via fiber links at the remote site. Coherent signals are first transferred to the same remote site via two stabilized fiber links. The two signals at the remote site are compared with each other. The relative phase difference can represent transfer stability loss. This evaluation method at the remote site has been compared with the traditional one with which the signal is evaluated at the local site. The two results match perfectly. It indicates that the method is available to evaluate the transfer performance of radio frequency (RF) dissemination in such applications as antenna array systems. 
Shanglin Li, Haoyuan Lu, Shuangyou Zhang, Dawei Li, Jianxiao Leng and   Jianye Zhao
physics.ins-det