Abstract
We use a new technique to disseminate microwave reference signals along ordinary optical fiber. The fractional frequency resolution of a link of 86 km in length is for a one day integration time, a resolution higher than the stability of the best microwave or optical clocks. We use the link to compare the microwave reference and a frequency standard that stabilizes a femtosecond laser frequency comb. This demonstrates a resolution of at 1 s. An upper value of the instability introduced by the femtosecond laser-based synthesizer is estimated as at 1 s.
- Received 22 December 2004
DOI:https://doi.org/10.1103/PhysRevLett.94.203904
©2005 American Physical Society