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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 17 — Aug. 15, 2011
  • pp: 16498–16507

All-optical link for direct comparison of distant optical clocks

Miho Fujieda, Motohiro Kumagai, Shigeo Nagano, Atsushi Yamaguchi, Hidekazu Hachisu, and Tetsuya Ido  »View Author Affiliations

Optics Express, Vol. 19, Issue 17, pp. 16498-16507 (2011)

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We developed an all-optical link system for making remote comparisons of two distant ultra-stable optical clocks. An optical carrier transfer system based on a fiber interferometer was employed to compensate the phase noise accumulated during the propagation through a fiber link. Transfer stabilities of 2 × 10−15 at 1 second and 4 × 10−18 at 1000 seconds were achieved in a 90-km link. An active polarization control system was additionally introduced to maintain the transmitted light in an adequate polarization, and consequently, a stable and reliable comparison was accomplished. The instabilities of the all-optical link system, including those of the erbium doped fiber amplifiers (EDFAs) which are free from phase-noise compensation, were below 2 × 10−15 at 1 second and 7 × 10−17 at 1000 seconds. The system was available for the direct comparison of two distant 87Sr lattice clocks via an urban fiber link of 60 km. This technique will be essential for the measuring the reproducibility of optical frequency standards.

© 2011 OSA

OCIS Codes
(060.2360) Fiber optics and optical communications : Fiber optics links and subsystems
(120.3940) Instrumentation, measurement, and metrology : Metrology
(120.4800) Instrumentation, measurement, and metrology : Optical standards and testing

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: July 6, 2011
Revised Manuscript: August 2, 2011
Manuscript Accepted: August 5, 2011
Published: August 11, 2011

Miho Fujieda, Motohiro Kumagai, Shigeo Nagano, Atsushi Yamaguchi, Hidekazu Hachisu, and Tetsuya Ido, "All-optical link for direct comparison of distant optical clocks," Opt. Express 19, 16498-16507 (2011)

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