Coherent optical phase transfer over a 32-km fiber with 1-s instability at $10^{-17}$

Abstract

The phase coherence of an ultrastable optical frequency reference is fully maintained over actively stabilized fiber networks of lengths exceeding 30 km. For a 7-km link installed in an urban environment, the transfer instability is $6\times 10^{-18}$ at 1-s. The excess phase noise of 0.15 rad, integrated from 8 mHz to 25 MHz, yields a total timing jitter of 0.085 fs. A 32-km link achieves similar performance. Using frequency combs at each end of the coherent-transfer fiber link, a heterodyne beat between two independent ultrastable lasers, separated by 3.5 km and 163 THz, achieves a 1-Hz linewidth.

4 pages, 4 figures

References in corpus (2)

• Compact, thermal-noise-limited optical cavity for diode laser stabilization at 1 x 10-15
• ${}^{87}$Sr lattice clock with inaccuracy below 10${}^{-15}$

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