Phase-coherent frequency comparison of optical clocks using a telecommunication fiber link

Schnatz, H.; Terra, Osama; Predehl, Katharina; Feldmann, Thorsten; Legero, Thomas; Lipphardt, B.; Sterr, U.; Grosche, G.; Hänsch, Theodor W.; Holzwarth, Ronald; Udem, Th.; Lu, Zehuang; Wang, L.; Ertmer, W.; Friebe, J.; Pape, A.; Rasel, Ernst M.; Riedmann, M.; Wübbena, T.

doi:10.1109/freq.2009.5168297

Cited by 14 publications

(14 citation statements)

References 37 publications

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“…A system which allows frequency measurements independent of the reference clock not only will improve the accuracy of the measurements limited by the equipment but also will be very attractive for remote comparison of frequency combs without the need of using several systems [11,12].…”

Section: Introductionmentioning

confidence: 99%

Application of Brillouin scattering to optical frequency combs

et al. 2012

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Optical frequency combs are a useful tool for measuring reference laser frequency whose uncertainty depends on the stability and accuracy of the reference clock. The relative uncertainty of the laser frequency measurements in the optical telecommunication band with the frequency comb technique is estimated around 10 -12 . In this paper, we present the development and implementation of a filtering technique on an optical frequency comb based on an Erbium optical fiber oscillator using Brillouin scattering amplification. This filtering technique allows us to isolate and transmit frequencies generated by a stabilized optical frequency comb. This method has been developed for the remote comparison of frequency combs. Finally, we present the characterization of the optical frequency comb and its application to the calibration of high wavelength resolution meters in the optical telecommunications window. Measurements with uncertainties under the resolution of the own instrument were achieved using stabilized lasers at molecular absorptions. The result is a significant improvement of the measurement capability given by the current equipment.

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Section: Introductionmentioning

confidence: 99%

Application of Brillouin scattering to optical frequency combs

et al. 2012

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“…Stable radio and microwave frequencies transmission over an optical link has already been demonstrated [3][4][5][9][10][11][12]. Frequency transfer using the optical phase of an ultra-stable laser over a dedicated fiber link was reported on distances up to about 200 km by several groups [13][14][15][16][17][18][19]. The present challenge is to extend this technique of frequency dissemination on longer distances in order to connect laboratories of different countries.…”

Section: Introductionmentioning

confidence: 99%

Multiplexed optical link for ultra-stable frequency dissemination

Lopez

Amy‐Klein

Jiang

et al. 2010

EFTF-2010 24th European Frequency and Time Forum

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“…Their short-term stability enables oper ation of optical clocks [1]- [4], frequency dissemination via optical fiber [5]- [7] and generation of optical microwave via frequency combs [8]- [10]. In conventional setups thermal noise in the reference optical cavity fundamentally limits the frequency stability of the laser to a level of a few times 10-1 6…”

Section: Introductionmentioning

confidence: 99%

A sub-40 mHz laser based on a silicon single-crystal optical cavity

Keßler

Hagemann

Sterr

et al. 2012

2012 Conference on Precision Electromagnetic Measurements

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State-of-the-art optical oscillators are limited by thermal noise that causes fluctuations of the cavity length. This laser performance is currently setting the limit for the stability of optical clocks. We demonstrate that single crystal silicon as resonator material can potentially reduce the thermal noise limit for optical cavities by an order of magnitude. We present an experimental realization of such a cavity where the spacer and the mirror substrates are both machined from single crystal silicon and operated at 124 K where the thermal expansion coefficient is zero. We present the setup and performance of this cavity.The stability was analyzed in a three-cornered-hat analysis of heterodyne beat signals among three independent stable lasers.The silicon cavity demonstrates a fractional frequency stability of 1 x 10-16 at short time scales and supports a world-record laser linewidth of <40 mHz at 1.5 Mm.

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Phase-coherent frequency comparison of optical clocks using a telecommunication fiber link

Cited by 14 publications

References 37 publications

Application of Brillouin scattering to optical frequency combs

Application of Brillouin scattering to optical frequency combs

Multiplexed optical link for ultra-stable frequency dissemination

A sub-40 mHz laser based on a silicon single-crystal optical cavity

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