Transmission of an optical frequency through a 3 km long optical fiber

Beauvoir, B. de; Nez, F.; Hilico, Laurent; Julién, L.; Biraben, F.; Cagnac, B.; Zondy, J.‐J.; Touahri, D.; Acef, O.; Clairon, A.

doi:10.1007/s100530050085

Cited by 28 publications

(22 citation statements)

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“…Satellite techniques are advantageous in bridging long-distances, giving global access and flexibility of location. In recent years, methods based on optical telecommunication fibre networks developed rapidly: early attempts already achieved a fractional uncertainty of 10 -14 over a short distance of 3 km (de Beauvoir et al 1998). More recently, a fractional frequency uncertainty close to 10 -20 was obtained over a loop of 1400 km rented telecom fibre in optimal cases, when transferring an optical frequency (Raupach et al 2015).…”

Section: Clock Comparisons and Frequency Transfermentioning

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: Clock Comparisons and Frequency Transfermentioning

confidence: 99%

Atomic clocks for geodesy

et al. 2018

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“…The main link input is at SYRTE and is composed of two sections of 86 km and 6 km. The first one is using two parallel dedicated fibers of 43 km linking SYRTE to LPL [5], the second one is using two parallel dedicated fibers of 3 km linking SYRTE to LKB [22]. That way, the two ends of the main link and the extraction set-up are at the same place, at SYRTE.…”

Section: Resultsmentioning

confidence: 99%

“…In France, such an extraction set-up will be utilized for metropolitan area distribution, as for example in the Paris area. Specifically, it will be installed at Kastler-Brossel laboratory (LKB), located in the center of Paris, which already receives an ultra-stable RF signal from SYRTE [22] for highresolution spectroscopy of Hydrogen [26] and high precision determination of the fine structure constant [27]. These experiments will benefit from the improved stability and accuracy of an optical frequency reference.…”

Section: Resultsmentioning

confidence: 99%

In-line extraction of an ultra-stable frequency signal over an optical fiber link

Bercy

Stefani

Guellati-Khélifa

et al. 2014

2014 European Frequency and Time Forum (EFTF)

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Received Month X, XXXX; revised Month X, XXXX; accepted Month X, XXXX; posted Month X, XXXX (Doc. ID XXXXX); published Month X, XXXX We demonstrate in-line extraction of an ultra-stable frequency signal over an optical link of 92-km of installed telecommunication fibers, following the proposition of G. Grosche in 2010 [1]. We show that the residual frequency noise at the extraction end is noticeably below that at the main link output when the extraction is near the input end, as expected from a simple model of the noise compensation. We obtain relative frequency instabilities, expressed as overlapping Allan deviation, of 8×10 -16 at 1 s averaging time and a few 10 -19 at 1 day. These results are at the state-of-the-art for a link using urban telecommunication fibers. We also propose an improved scheme which delivers an ultra-stable signal of higher power, in order to feed a secondary link. In-line extraction opens the way to a broad distribution of an ultra-stable frequency reference, enabling a wide range of applications beyond metrology.

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“…We receive a RF signal at 100 MHz locked on a primary atomic frequency standard from an optical fiber linking our laboratory to the nearby BNM-SYRTE [11] . We use a radio-frequency chain to generate a signal at 11 GHz mixed with a frequency synthesizer to make it tunable.…”

Section: Absolute-frequency Measurementsmentioning

confidence: 99%

Towards an absolute measurement of the 1S3S line in atomic hydrogen

Olivier¹,

Nez²,

Schwob³

et al. 2005

Can. J. Phys.

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For very high-precision spectroscopy such as the two photon 1S-nS transitions in hydrogen, the ability to measure precisely the absolute frequency of the excitation laser is required together with the best possible signal-to-noise ratio for the fluorescence signal. In the context of our experiment on the 1S-3S transition, we present the specificities of our optical frequency comb apparatus, as well as a new detection scheme that makes use of the spatial information provided by a CCD camera detector.Résumé : Dès qu'il s'agit de spectroscopie à très haute résolution, comme dans le cas de la mesure des transitions 1S-nS dans l'atome d'hydrogène, il est nécessaire de pouvoir mesurer avec précision la fréquence absolue du laser d'excitation, tout en atteignant le meilleur rapport signal à bruit possible pour le signal de fluorescence. Dans le cadre de notre expérience visant à mesurer la raie 1S-3S, nous présentons les particularités de notre dispositif de mesure de fréquences, ainsi qu'une nouvelle méthode de détection de la transition qui met à profit l'information spatiale fournie par une caméra CCD.

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Transmission of an optical frequency through a 3 km long optical fiber

Cited by 28 publications

References 0 publications

Atomic clocks for geodesy

Atomic clocks for geodesy

In-line extraction of an ultra-stable frequency signal over an optical fiber link

Towards an absolute measurement of the 1S3S line in atomic hydrogen

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Transmission of an optical frequency through a 3 km long optical fiber

Cited by 28 publications

References 0 publications

Atomic clocks for geodesy

Atomic clocks for geodesy

In-line extraction of an ultra-stable frequency signal over an optical fiber link

Towards an absolute measurement of the 1S3S line in atomic hydrogen

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Towards an absolute measurement of the 1S3S line in atomic hydrogen