Long-distance remote comparison of ultrastable optical frequencies with 10^-15 instability in fractions of a second

Pape, A.; Terra, Osama; Friebe, J.; Riedmann, M.; Wübbena, T.; Rasel, Ernst M.; Predehl, Katharina; Legero, Thomas; Lipphardt, B.; Schnatz, H.; Grosche, G.

doi:10.1364/oe.18.021477

Cited by 28 publications

(17 citation statements)

References 23 publications

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“…After the 146 km loop PTB-Hanover-PTB had been tested down to the 1×10 -19 level (Grosche et al 2009), an ultra-stable laser in the near-infrared was remotely characterised in Hanover (via 73 km fibre) with sub Hz-resolution (Pape et al 2010)-and subsequently, the transition of the Mg optical clock (in the same lab in Hanover) was remotely measured versus a primary frequency reference at PTB, Braunschweig on the same link (Friebe et. al.…”

Section: How To Test a Link -And Perform Accurate Frequency Comparisomentioning

confidence: 99%

Atomic clocks for geodesy

et al. 2018

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We review experimental progress on optical atomic clocks and frequency transfer, and consider the prospects of using these technologies for geodetic measurements. Today, optical atomic frequency standards have reached relative frequency inaccuracies below 10, opening new fields of fundamental and applied research. The dependence of atomic frequencies on the gravitational potential makes atomic clocks ideal candidates for the search for deviations in the predictions of Einstein's general relativity, tests of modern unifying theories and the development of new gravity field sensors. In this review, we introduce the concepts of optical atomic clocks and present the status of international clock development and comparison. Besides further improvement in stability and accuracy of today's best clocks, a large effort is put into increasing the reliability and technological readiness for applications outside of specialized laboratories with compact, portable devices. With relative frequency uncertainties of 10, comparisons of optical frequency standards are foreseen to contribute together with satellite and terrestrial data to the precise determination of fundamental height reference systems in geodesy with a resolution at the cm-level. The long-term stability of atomic standards will deliver excellent long-term height references for geodetic measurements and for the modelling and understanding of our Earth.

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Section: How To Test a Link -And Perform Accurate Frequency Comparisomentioning

confidence: 99%

Atomic clocks for geodesy

et al. 2018

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“…As an even more demanding application, we investigated the real-time comparison of ultra-stable clock lasers at sub-Hz level via remote measurements over the 73 km fibre link. With a frequency resolution of 3x10 -15 within a tenth of a second measuring time [6], this opens up new possibilities of remote metrology, including remote spectroscopy.…”

Section: Regional Fibre Links and Remote Frequency Measurementsmentioning

confidence: 99%

High performance frequency comparisons over optical fibre

Grosche

Predehl

Raupach

et al. 2011

2011 International Quantum Electronics Conference (IQEC) and Conference on Lasers and Electro-Optics (CLEO) Pacific Rim Incorpo

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We aim at distributing the most precise frequency references provided by optical clocks, both from specialized labs to end users, and between specialized labs for comparing optical clocks. Transmitting an optical carrier over standard telecom fibre, we have transported frequency information over up to 900 km distance, with fidelity close to theoretical limits and reaching a precision of a few parts in 10 18 .

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“…A groundbreaking frequency transfer has been demonstrated on a record distance of 920 km and even 1840 km on a dedicated fibre network [27,32]. The outcome of such a technique leads to high resolution comparisons between remote clocks in conjunction with the use of femtosecond frequency combs [26,[33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Frequency and time transfer for metrology and beyond using telecommunication network fibres

Lopez

Kéfélian

Jiang

et al. 2015

Comptes Rendus. Physique

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The distribution and the comparison of an ultra-stable optical frequency and accurate time using optical fibres have been greatly improved in the last ten years. The frequency stability and accuracy of optical links surpass well-established methods using the global navigation satellite system and geostationary satellites. In this paper, we present a review of the methods and the results obtained. We show that public telecommunication network carrying Internet data can be used to compare and distribute ultra-stable metrological signals over long distances. This novel technique paves the way for the deployment of a national and continental ultra-stable metrological optical network. RésuméLa distribution et la comparaison d'étalons de fréquence optique ultra-stables et d'échelle de temps ont été grandement améliorées depuis dix ans par l'emploi de fibres optiques. La stabilité de fréquence et l'exactitude des liens optiques fibrés surpassent les méthodes bien établies fondées sur les communications satellitaires. Dans cet article, nous présentons les méthodes et les résultats obtenus pendant cette décade. Nous montrons que les réseaux de télécommunication publics transportant des données internet peuvent être utilisés pour comparer et distribuer des signaux métrologiques sur de grandes distances. Ceci ouvre la voie au déploiement d'un réseau métrologique à l'échelle nationale et continentale.

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Long-distance remote comparison of ultrastable optical frequencies with 10^-15 instability in fractions of a second

Cited by 28 publications

References 23 publications

Atomic clocks for geodesy

Atomic clocks for geodesy

High performance frequency comparisons over optical fibre

Frequency and time transfer for metrology and beyond using telecommunication network fibres

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