Stable radio-frequency transfer over optical fiber by phase-conjugate frequency mixing

Yabai He, Brian J. Orr, Kenneth G H Baldwin, Michael J. Wouters, Andre N. Luiten, Guido Aben, R. Bruce Warrington

Research output: Contribution to journalArticlepeer-review

71 Citations (Scopus)


We demonstrate long-distance (≤100-km) synchronization of the phase of a radio-frequency reference over an optical-fiber network without needing to actively stabilize the optical path length. Frequency mixing is used to achieve passive phase-conjugate cancellation of fiber-length fluctuations, ensuring that the phase difference between the reference and synchronized oscillators is independent of the link length. The fractional radio-frequency-transfer stability through a 100-km "real-world" urban optical-fiber network is 6 × 10-17 with an averaging time of 104 s. Our compensation technique is robust, providing long-term stability superior to that of a hydrogen maser. By combining our technique with the short-term stability provided by a remote, high-quality quartz oscillator, this system is potentially applicable to transcontinental optical-fiber time and frequency dissemination where the optical round-trip propagation time is significant.

Original languageEnglish
Pages (from-to)18754-18764
Number of pages11
JournalOptics Express
Issue number16
Publication statusPublished - 12 Aug 2013

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