2013 Joint European Frequency and Time Forum &Amp; International Frequency Control Symposium (EFTF/IFC) 2013
DOI: 10.1109/eftf-ifc.2013.6702195
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LIFT-the Italian link for time and frequency

Abstract: Abstract-We report on the realization of the coherent optical link for time and frequency dissemination developed in Italy. The fiber backbone connects scientific laboratories that need accurate time and frequency measurements located in Torino, Milano, Bologna and Firenze. We briefly describe the technique, and report the status of installation and preliminary characterization.

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Cited by 5 publications
(3 citation statements)
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“…Phase-compensated optical links have proved to be reliable from this point of view and outperform state-ofthe-art satellite techniques by orders of magnitude [4]. The trasmission of RF and microwaves [5][6][7][8][9], optical frequencies [10][11][12][13], and of an optical comb [14] have been demonstrated, and time dissemination has recently been performed as well [15][16][17]. In coherent optical links the phase noise added by the fiber due to environmental noise is actively cancelled.…”
mentioning
confidence: 99%
“…Phase-compensated optical links have proved to be reliable from this point of view and outperform state-ofthe-art satellite techniques by orders of magnitude [4]. The trasmission of RF and microwaves [5][6][7][8][9], optical frequencies [10][11][12][13], and of an optical comb [14] have been demonstrated, and time dissemination has recently been performed as well [15][16][17]. In coherent optical links the phase noise added by the fiber due to environmental noise is actively cancelled.…”
mentioning
confidence: 99%
“…On the long-term, the laser is phase-locked to a hydrogen maser referenced to a Cesium fountain primary frequency standard with 2 × 10 −16 relative frequency accuracy (Levi et al, 2014). This optical reference is disseminated to LENS via a fiber link named LIFT (Italian Link for Frequency and Time) (Levi et al, 2013;Calonico et al, 2014) that has been implemented on a dark fiber of the Italian National Research and Education Network administrated by the consortium GARR. A series of 9 bidirectional amplifiers are installed along the fiber path to compensate for the signal attenuation, for a total amplification of 165 dB.…”
Section: Fiber-link-enhanced Spectroscopymentioning
confidence: 99%
“…It motivates a wide community of scientists, from fundamental to applied physics and industry, to consider this technique for various applications [12][13][14][15][16][17][18][19]. Projects aiming at creating metrological networks at national and continental scale over telecommunication fiber networks are pushing the technology forward, as their implementation requires a high level of maturity [20][21][22][23]. Such metrological networks require the know-how to be transferred from academia to industrial partners who can in turn provide the scientific community with a high quality of service.…”
Section: Introductionmentioning
confidence: 99%