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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/24234
Title: A coherent fiber link for very long baseline interferometry
Authors: Clivati, Cecilia
Costanzo, Giovanni A.
Frittelli, Matteo
Levi, Filippo
Mura, Alberto
Zucco, Massimo
AMBROSINI, ROBERTO
BORTOLOTTI, CLAUDIO 
PERINI, FEDERICO 
ROMA, MAURO 
Calonico, Davide
Issue Date: 2015
Journal: IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL 
Number: 62
Issue: 11
First Page: 1907
Abstract: We realize a coherent fiber link for application in very long baseline interferometry (VLBI) for radio astronomy and geodesy. A 550-km optical fiber connects the Italian National Metrological Institute (INRIM) to a radio telescope in Italy and is used for the primary Cs fountain clock stability and accuracy dissemination. We use an ultrastable laser frequency- referenced to the primary standard as a transfer oscillator; at the radio telescope, an RF signal is generated from the laser by using an optical frequency comb. This scheme now provides the traceability of the local maser to the SI second, realized by the Cs fountain at the 1.7×10^-16 accuracy. The fiber link never limits the experiment and is robust enough to sustain radio astronomical campaigns. This experiment opens the possibility of replacing the local hydrogen masers at the VLBI sites with optically-synthesized RF signals. This could improve VLBI resolution by providing more accurate and stable frequency references and, in perspective, by enabling common- clock VLBI based on a network of telescopes connected by fiber links.
URI: http://hdl.handle.net/20.500.12386/24234
URL: https://ieeexplore.ieee.org/document/7321699
ISSN: 0885-3010
DOI: 10.1109/TUFFC.2015.007221
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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LIFTforRadioastronomy-2.pdf1.17 MBAdobe PDFView/Open
07321699.pdf[administrators only]2.41 MBAdobe PDF
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