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Optical Frequency Transfer via 1840 km Fiber Link with superior Stability

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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 × 1015 at 1 s with 4 × 1019 after 100 s. The transferred frequency shows no systematic offset within an uncertainty of 3 × 1019. Analyzing the underlying noise structure reveals a τ2 response in the modified Allan deviation, which is confirmed by calculations of the frequency instability from frequency counter data as well as from phase noise data.

© 2014 Optical Society of America

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