The Frequency Transfer over 1000 km of Fiber Using the Optical Frequency Comb

We experimentally demonstrate a frequency transfer over 1000 km of fiber by exploiting the optical frequency comb. Through the feedback of the phase shifter, active phase noise cancellation is achieved. The fractional frequency instability of 2.4×10−15 at 1 s and 1.1×10−18 at 10000 s are measured respectively. The results support ultrastable frequency transfer applications vi...