National infrastructure for dissemination of precise time and interconnection of quantum sources of ultra-stable optical frequency - CITAF

0568228 - ÚPT 2023 PL eng A - Abstract
Vojtěch, J. - Havliš, O. - Šlapák, M. - Altmannová, L. - Smotlacha, V. - Pospíšil, P. - Kundrát, J. - Vohnout, R. - Velc, R. - Čížek, Martin - Hrabina, Jan - Řeřucha, Šimon - Pravdová, Lenka - Lazar, Josef - Číp, Ondřej - Kuna, Alexander - Roztočil, J.
National infrastructure for dissemination of precise time and interconnection of quantum sources of ultra-stable optical frequency - CITAF.
Book of Abstracts. 22nd Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics, September 5-9, 2022, Wojanów, Poland. Wrocław: Wroclaw University of Science and Technology, 2022 - (Sztylińska, K.). s. 153-154
[Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics /22./. 05.09.2022-09.09.2022, Wojanow]
EU Projects: European Commission(XE) 951886 - CLONETS-DS
Research Infrastructure: e-INFRA CZ - 90140
Institutional support: RVO:68081731 ; RVO:67985882
Keywords : precise time * coherent optical frequency * quantum sources of optical frequency * time metrology * infrastructure * optical amplification * optical fibe
OECD category: Telecommunications
https://psc2022.pwr.edu.pl/docs/pscoc2022_book_of_abstracts.pdf

In the contribution, we introduce the Czech Infrastructure for Time and Frequency activity which is a non-commercial, open activity focused on the transfer of accurate time and very stable quantum sources of optical frequency using optical networks. The national optical infrastructure for time and frequency transfer is operated on top of the CESNET network infrastructure, to have operational costs under control. We briefly summarize prerequisites in order to allow long haul transmission of ultra-precise time and ultra-stable coherent optical frequency with stability going down to 2 ps in terms of TDEV and 10-18 in terms of ADEV for 103 s averaging over optical fibers shared with telecommunication data transmission. Affordable precise time and radio frequency transmission with MTIE below 200 ps for multi hundred km distances is addressed too. Addressed is creation of bidirectional dark channels on different wavebands within shared fibers together with bidirectional compensation of fiber losses. Single path bidirectional compensation deploying lumped optical amplifiers is sensitive to feedback from fiber line (back scattering and reflections) and in case of increased feedback can produce unwanted oscillations, which potentially interfere with parallel data transmissions. Affordable detection of these unwanted oscillations without bulky and expensive optical spectrum analyzer is presented. We also address running and planned upgrades and future development plans regarding wavelength bands and considered geographic extensions.
Permanent Link: https://hdl.handle.net/11104/0339559