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Feb 2007

Volume 78, Issue 2, pp. 1-029901-1

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Rev. Sci. Instrum. 78, 021101 (2007); http://dx.doi.org/10.1063/1.2437069 (25 pages)

Seth M. Foreman, Kevin W. Holman, Darren D. Hudson, David J. Jones, and Jun Ye
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Remote transfer of ultrastable frequency references via fiber networks

Seth M. Foreman, Kevin W. Holman, Darren D. Hudson, David J. Jones, and Jun Ye

Rev. Sci. Instrum. 78, 021101 (2007); http://dx.doi.org/10.1063/1.2437069 (25 pages) | Cited 56 times

Online Publication Date: 28 February 2007

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Three distinct techniques exist for distributing an ultrastable frequency reference over optical fibers. For the distribution of a microwave frequency reference, an amplitude-modulated continuous wave (cw) laser can be used. Over kilometer-scale lengths this approach provides an instability at 1 s of ∼ 3×10−14 without stabilization of the fiber-induced noise and ∼ 1×10−14 with active noise cancellation. An optical frequency reference can be transferred by directly transmitting a stabilized cw laser over fiber and then disseminated to other optical and microwave regions using an optical frequency comb. This provides an instability at 1 s of 2×10−14 without active noise cancellation and 3×10−15 with active noise cancellation [Recent results reduce the instability at 1 s to 6×10−18.] Finally, microwave and optical frequency references can be simultaneously transmitted using an optical frequency comb, and we expect the optical transfer to be similar in performance to the cw optical frequency transfer. The instability at 1 s for transfer of a microwave frequency reference with the comb is ∼ 3×10−14 without active noise cancellation and <7×10−15 with active stabilization. The comb can also distribute a microwave frequency reference with root-mean-square timing jitter below 16 fs integrated over the Nyquist bandwidth of the pulse train ( ∼ 50 MHz) when high-bandwidth active noise cancellation is employed, which is important for remote synchronization applications.
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06.20.fb Standards and calibration
42.81.-i Fiber optics
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