Optical fiber links are beneficial not only for frequency metrology, but also for other fields of physical research, such as radioastronomy and geodesy. We realized the first optical fiber link from a National Institute of Metrology to a Radiotelescope used for Very Long Baseline Interferometry and for geodetic measurements, over a distance of 544 km. We performed a remote calibration of the hydrogen-maser used as a frequency reference at Medicina Radiotelescopes, in central Italy, against the Italian Cs fountain primary frequency standard. The comparison was limited by the statistical uncertainty of the hydrogen-masers. This experiment demonstrates that optical links can provide radioastronomical facilities with very accurate and stable frequency references, in perspective better than the currently used hydrogen-masers. This opens new perspectives in the ultimate limits of VLBI and a more precise space geodesy.

The Optical Fiber Link LIFT for Radioastronomy / Clivati, C.; Ambrosini, R.; Bortolotti, C.; Costanzo, Giovanni Antonio; Frittelli, M.; Levi, F.; Mura, A.; Perini, F.; Roma, M.; Zucco, M. E.; Calonico, D.. - ELETTRONICO. - (2015), pp. 769-772. (Intervento presentato al convegno Frequency Control Symposium & the European Frequency and Time Forum (FCS), 2015 Joint Conference of the IEEE International tenutosi a Denver, CO nel 12-16 April 2015) [10.1109/FCS.2015.7138955].

The Optical Fiber Link LIFT for Radioastronomy

COSTANZO, Giovanni Antonio;
2015

Abstract

Optical fiber links are beneficial not only for frequency metrology, but also for other fields of physical research, such as radioastronomy and geodesy. We realized the first optical fiber link from a National Institute of Metrology to a Radiotelescope used for Very Long Baseline Interferometry and for geodetic measurements, over a distance of 544 km. We performed a remote calibration of the hydrogen-maser used as a frequency reference at Medicina Radiotelescopes, in central Italy, against the Italian Cs fountain primary frequency standard. The comparison was limited by the statistical uncertainty of the hydrogen-masers. This experiment demonstrates that optical links can provide radioastronomical facilities with very accurate and stable frequency references, in perspective better than the currently used hydrogen-masers. This opens new perspectives in the ultimate limits of VLBI and a more precise space geodesy.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2624912
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