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Coherent microwave transfer over a 204-km telecom fiber link by a cascaded system

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3 Author(s)
Fujieda, M. ; Nat. Inst. of Inf. & Commun. Technol., Koganei, Japan ; Kumagai, M. ; Nagano, S.

We have demonstrated a microwave transfer over a 204-km noisy urban fiber link by a cascaded system with 2 stages, which connected 10-GHz and 1-GHz transfer systems in series. A diurnal phase-noise cancellation ratio of 45 dB was obtained by use of an electronic phase-noise compensation system. Additionally, the stabilities reached 6 ?? 10-14 at 1 s and 5 ?? 10-17 at one-half day, which agreed with the root-sumsquare of those of the 10-GHz and 1-GHz transfers. We verified for the first time that the transfer stability degrades only ??(N) times in a cascaded system with N stages.

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Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on  (Volume:57 ,  Issue: 1 )