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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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optica-7-8-1031.pdf | Pdf editoriale | 2.43 MB | Adobe PDF | View/Open |
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