National infrastructure for dissemination of precise time and ultra-stable optical frequency also aiming to connect quantum sources: CITAF

Josef Vojtech; Vladimir Smotlacha; Ondrej Havlis; Rudolf Vohnout; Michal Spacek; Tomas Novak; Elisabeth Andriantsarazo; Martin Slapak; Lada Altmannova; Radek Velc; Petr Pospisil; Jan Kundrat; Martin Cizek; Jan Hrabina; Simon Rerucha; Lenka Pravdova; Josef Lazar; Ondrej Cip; Alexander Kuna; Jaroslav Roztocil

doi:10.1117/12.2665497

6 June 2023 National infrastructure for dissemination of precise time and ultra-stable optical frequency also aiming to connect quantum sources: CITAF

Josef Vojtech, Vladimir Smotlacha, Ondrej Havlis, Rudolf Vohnout, Michal Spacek, Tomas Novak, Elisabeth Andriantsarazo, Martin Slapak, Lada Altmannova, Radek Velc, Petr Pospisil, Jan Kundrat, Martin Cizek, Jan Hrabina, Simon Rerucha, Lenka Pravdova, Josef Lazar, Ondrej Cip, Alexander Kuna, Jaroslav Roztocil

Author Affiliations +

Proceedings Volume 12570, Quantum Optics and Photon Counting 2023; 1257003 (2023) https://doi.org/10.1117/12.2665497
Event: SPIE Optics + Optoelectronics, 2023, Prague, Czech Republic

Abstract

There has been an increased focus on precise time and frequency transmission dissemination at a national and international level recently. We would like to present the situation in the Czech Republic, our strategy, approach, and our experience with a non-commercial, cost-effective solution that utilizes shared optical networks. The presented solution provides accurate time and stable frequency at a lower operational cost, utilizing the shared spectrum of the CESNET3 network infrastructure. We are committed to future developments and upgrades that will include the next wavelength bands and geographic extensions. Additionally, we have implemented bidirectional dark channels on various wavebands, which utilize shared leased fibers and offer bidirectional compensation for fiber losses. However, operating precise time and frequency requires a single path with bidirectional amplification performed by optical amplifiers, which are sensitive to feedback from the fiber line induced by back-scattering, and reflections, and which can cause unwanted oscillations. We have addressed this issue by carefully solving the interference with parallel data transmissions. In summary, we have implemented a cost-effective solution for precise time and frequency dissemination in the Czech Republic, which utilizes shared optical networks. We are committed to future developments, and we are also part of a consortium that plans to realize a Pan-European network to offer time and frequency services to a broad range of users.

Conference Presentation

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Josef Vojtech, Vladimir Smotlacha, Ondrej Havlis, Rudolf Vohnout, Michal Spacek, Tomas Novak, Elisabeth Andriantsarazo, Martin Slapak, Lada Altmannova, Radek Velc, Petr Pospisil, Jan Kundrat, Martin Cizek, Jan Hrabina, Simon Rerucha, Lenka Pravdova, Josef Lazar, Ondrej Cip, Alexander Kuna, and Jaroslav Roztocil "National infrastructure for dissemination of precise time and ultra-stable optical frequency also aiming to connect quantum sources: CITAF", Proc. SPIE 12570, Quantum Optics and Photon Counting 2023, 1257003 (6 June 2023); https://doi.org/10.1117/12.2665497

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