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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/20.500.12386/31363
Title: Common-clock very long baseline interferometry using a coherent optical fiber link
Authors: CLIVATI, CECILIA
AIELLO, ROBERTO
BIANCO, GIUSEPPE
BORTOLOTTI, CLAUDIO 
DE NATALE, PAOLO
DI SARNO, VALENTINA
MADDALONI, PASQUALE
MACCAFERRI, GIUSEPPE 
MURA, ALBERTO
NEGUSINI, MONIA 
LEVI, FILIPPO
PERINI, FEDERICO 
RICCI, ROBERTO 
ROMA, MAURO 
SANTAMARIA AMATO, LUIGI
SICILIANI DE CUMIS, MARIO
STAGNI, Matteo 
TUOZZI, ALBERTO
CALONICO, DAVIDE
Issue Date: 2020
Journal: OPTICA 
Number: 7
Issue: 8
First Page: 1031
Abstract: Among the most powerful techniques for the exploration of the Universe is very long baseline interferometry (VLBI), which is based on the simultaneous observation of radio sources in the sky with arrays of distant ground-based antennas. One of the effects currently limiting its ultimate sensitivity is the phase-instability of the reference clocks adopted at each antenna. This termcan be made negligible delivering the same clock signal to multiple telescope sites using optical fibers. We realized such an infrastructure by disseminating a coherent optical frequency signal to two distant radio telescopes using a 1739-km-long fiber.We performed a 24 h geodetic VLBI campaign in which the same clock reference was used at both telescopes and analyzed it using standard VLBI procedures. The results were consistent with the expectations, confirming that the proposed approach is feasible and configures as a novel tool for studying the role of clocks, troposphere, and systematic effects in the ultimate VLBI resolution.
URI: http://hdl.handle.net/20.500.12386/31363
URL: https://opg.optica.org/optica/fulltext.cfm?uri=optica-7-8-1031&id=434588
ISSN: 2334-2536
DOI: 10.1364/optica.393356
Bibcode ADS: 2020Optic...7.1031C
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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