ABSTRACT
We demonstrate a free-space-based multiple-access frequency transfer with an optical frequency comb by using a passive phase conjunction correction technique. Timing fluctuations and Allan deviations are both measured to characterize the excess frequency instability incurred during the frequency transfer process. By reproducing a 2 GHz radio-frequency signal at a middle point over a 60-m long free-space link in 5000s, the total Root-Mean-Square (RMS) timing fluctuation was measured to be about 224 fs with a fractional frequency instability yon the order of 8 × 10−14 at 1 s and 1 × 10−16 at 1000s. This free-space-based multiple-access frequency transfer with passive phase conjunction correction can be used to disseminate a stable frequency signal at arbitrary point in a free-space link.
