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arXiv:1404.0395 · Applied Physics B

High-accuracy coherent optical frequency transfer over a doubled 642-km fiber link

Davide Calonico, Elio K. Bertacco, Claudio Eligio Calosso, Cecilia Clivati, Giovanni Antonio Costanzo, Matteo Frittelli, A. Godone, Alberto Mura, N. Poli, Denis V. Sutyrin, Guglielmo Maria Tino, Massimo E. Zucco, Filippo Levi

Published Sep 3, 2014• 168 citations
arXivHTMLPDF
DOI
10.1007/s00340-014-5917-8

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We demonstrate coherent optical frequency dissemination over a distance of 972 km by cascading two spans where the phase noise is passively compensated for. Instead of employing a phase discriminator and a phase locking loop in the conventional active phase control scheme, the passive phase noise cancellation is realized by feeding double-trip beat-note frequency to the driver of the acoustic optical modulator at the local site. This passive scheme exhibits fine robustness and reliability, making it suitable for long-distance and noisy fiber links. An optical regeneration station is used in the link for signal amplification and cascaded transmission. The phase noise cancellation and transfer instability of the 972-km link is investigated, and transfer instability of 1.1 × 10−19 at 104 s is achieved. This work provides a promising method for realizing optical frequency distribution over thousands of kilometers by using fiber links.