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arXiv · 0707.0096

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

Seth M. Foreman·Andrew D. Ludlow·Marcio H. G. de Miranda·Jason E. Stalnaker·Scott A. Diddams·Jun Ye
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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.

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Seth M. Foreman, Andrew D. Ludlow, Marcio H. G. de Miranda, Jason E. Stalnaker, Scott A. Diddams, Jun Ye. 2007-07-01. Coherent optical phase transfer over a 32-km fiber with 1-s instability at $10^{-17}$. https://doi.org/10.1103/physrevlett.99.153601

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