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Conference on Lasers and Electro-Optics

Ultra Low Noise Er:fiber Frequency Comb Comparison

Michele Giunta, W. Hänsel, Katja Beha, Marc Fischer, M. Lezius, Ronald Holzwarth

Published Jan 1, 2016• 9 citations
Publisher

Abstract

We have optically compared two fiber-based frequency combs with ultra-high stability. The resulting beat frequency shows integrated phase noise below 100 mrad (100Hz to 2MHz) and an overlapping Allan deviation of 1×10−16 at 1s, dropping below 1×10−18 at 500s.
DOI
10.1364/cleo_si.2016.sth4h.1

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To compare the increasing number of optical frequency standards, highly stable optical signals have to be transferred over continental distances. We demonstrate optical-frequency transfer over a 1840-km underground optical fiber link using a single-span stabilization. The low inherent noise introduced by the fiber allows us to reach short term instabilities expressed as the modified Allan deviation of $2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}15}$ for a gate time $\ensuremath{\tau}$ of 1 s reaching $4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}19}$ in just 100 s. We find no systematic offset between the sent and transferred frequencies within the statistical uncertainty of about $3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}19}$. The spectral noise distribution of our fiber link at low Fourier frequencies leads to a ${\ensuremath{\tau}}^{\ensuremath{-}2}$ slope in the modified Allan deviation, which is also derived theoretically.