The optical fiber link LIFT for radioastronomy

Date Issued
2015
Author(s)
Clivati, C.
•
Ambrosini, R.
•
•
Costanzo, G. A.
•
Frittelli, M.
•
Levi, F.
•
•
•
Zucco, M. E.
•
Calonico, D.
•
Mura, A.
DOI
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.
Coverage
2015 Joint Conference of the IEEE International Frequency Control Symposium & the European Frequency and Time Forum
Start page
769
Conferenece
2015 Joint Conference of the IEEE International Frequency Control Symposium & the European Frequency and Time Forum
Conferenece place
Denver, USA
Conferenece date
April 12-16, 2015
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Url
Rights
open.access
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