High-resolution microwave frequency dissemination on an 86-km urban optical link
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TLDR
In this paper, the authors report the first demonstration of a long-distance ultra-stable frequency dissemination in the microwave range, using an 86-km urban optical link with a fractional frequency instability of 1.3×10−15 at 1-s integration time and below 10−18 at one day.Abstract:
We report the first demonstration of a long-distance ultra-stable frequency dissemination in the microwave range. A 9.15-GHz signal is transferred through an 86-km urban optical link with a fractional frequency instability of 1.3×10−15 at 1-s integration time and below 10−18 at one day. The optical link phase noise compensation is performed with a round-trip method. To achieve such a result we implement light polarisation scrambling and dispersion compensation. This link outperforms all the previous radio-frequency links and compares well with recently demonstrated full optical links.read more
Citations
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References
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Journal ArticleDOI
The fundamental constants and their variation: observational and theoretical status
Abstract: This article describes the various experimental bounds on the variation of the fundamental constants of nature. After a discussion of the role of fundamental constants, their definition and link with metrology, it reviews the various constraints on the variation of the fine-structure constant, the gravitational, weak- and strong-interaction couplings and the electron-to-proton mass ratio. The review aims (1) to provide the basics of each measurement, (2) to show as clearly as possible why it constrains a given constant, and (3) to point out the underlying hypotheses. Such an investigation is of importance in comparing the different results and in understanding the recent claims of the detection of a variation of the fine-structure constant and of the electron-to-proton mass ratio in quasar absorption spectra. The theoretical models leading to the prediction of such variation are also reviewed, including Kaluza-Klein theories, string theories, and other alternative theories. Cosmological implications of these results are also discussed. The links with the tests of general relativity are emphasized.
Journal ArticleDOI
Remote transfer of ultrastable frequency references via fiber networks
TL;DR: Three distinct techniques exist for distributing an ultrastable frequency reference over optical fibers, and it is expected that the optical transfer to be similar in performance to the cw optical frequency transfer.
Journal ArticleDOI
High-stability transfer of an optical frequency over long fiber-optic links
TL;DR: In this paper, theoretical predictions and experimental measurements for the achievable phase noise, timing jitter, and frequency stability in the coherent transport of an optical frequency over a fiber-optic link are discussed.
Journal ArticleDOI
Comparison between frequency standards in Europe and the USA at the 10-15 uncertainty level
Andreas Bauch,J. Achkar,Sébastien Bize,Davide Calonico,R Dach,R Hlavac,Luca Lorini,Thomas E. Parker,Gérard Petit,Dirk Piester,Krzysztof Szymaniec,P. Uhrich +11 more
TL;DR: In this article, the authors performed a comparison campaign of selected frequency references maintained in their laboratories during about 25 days in October/November 2004, using two-way satellite time and frequency transfer (TWSTFT) in an intensified measurement schedule of 12 equally spaced measurements per day.
Journal ArticleDOI
Coherent transfer of an optical carrier over 251 km.
TL;DR: This work transfers an optical frequency over 251 km of optical fiber with a residual instability of 6x10(-19) at 100 s and gives a simple expression for calculating the achievable instability and jitter over a fiber link.