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We investigated the transfer of a 194 THz optical frequency along a 1840 km fiber link. The fractional frequency instability expressed as the modified Allan deviation is 2.7 × 10−15 at 1 s with 4 × 10−19 after 100 s. The transferred frequency shows no systematic offset within an uncertainty of 3 × 10−19. Analyzing the underlying noise structure reveals a τ−2 response in the modified Allan deviation,...
Intercontinental frequency comparisons require satellite based techniques. We characterize a GPS carrier phase link with a baseline of 450 km using a long-distance phase-stabilized optical fiber link. Active hydrogen masers at both ends are compared via the GPS link and, via optical frequency combs at both ends, through the 920 km fiber link simultaneously. This technique allows us to independently...
Optical frequency transfer via a 1840 km fiber link has been investigated. Twenty fiber amplifiers and two fiber Brillouin amplifiers are needed to compensate for 420 dB of loss. Active noise compensation reduces the instability to 2.7 × 10−15 at 1 s with 4 × 10−19 after 100 s and an accuracy of a few parts in 1019.
Optical frequency transfer via a 920 km fiber link has been investigated. Active noise compensation enables the transfer of a stable optical frequency with a stability of 3.8 × 10−14 at 1 s reaching 4 × 10−18 after 104 s and an accuracy of 3.6 × 10−19.
In order to compare optical frequency standards over large distances PTB and MPQ are establishing an optical fiber link of more than 900 km length. We report the intermediate results of this project.
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