Abstract:
An optical frequency transfer at a wavelength of 1542 nm via an ultra-stable 5-m free-space link with active compensation of the phase noise caused by atmospheric fluctuations is demonstrated. The link-induced phase noise and its contribution to the frequency transfer instability are investigated. It is shown that, with the phase compensation system switched on, the link contribution to the relative transfer instability in terms of Allan deviation reaches 1.7 × 10-19 for a 5000-s averaging time.
Keywords:optical frequency transfer, relative frequency instability, Allan deviation, power spectral density of phase noise, freespace link, atmospheric turbulence.