Počet záznamů: 1  

Simultaneous transfer of optical frequency and time over 306 km long-haul optical fibre link

  1. 1.
    0468524 - ÚPT 2017 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
    Hucl, Václav - Čížek, Martin - Pravdová, Lenka - Řeřucha, Šimon - Hrabina, Jan - Mikel, Břetislav - Smotlacha, V. - Vojtěch, J. - Lazar, Josef - Číp, Ondřej
    Simultaneous transfer of optical frequency and time over 306 km long-haul optical fibre link.
    20th Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics (Proceedings of SPIE 10142). Bellingham: SPIE, 2016, s. 1-6, č. článku 101420M. ISSN 0277-786X.
    [Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics /20./. Jasná (SK), 05.09.2016-09.09.2016]
    Grant CEP: GA TA ČR(CZ) TH01011254; GA ČR GB14-36681G; GA MŠMT ED0017/01/01; GA MŠMT(CZ) LO1212
    Institucionální podpora: RVO:68081731
    Klíčová slova: optical fiber link * stable optical frequency transfer * GNSS * DWDM * FBG sensory networks
    Obor OECD: Optics (including laser optics and quantum optics)
    http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=2595358

    Optical fibre links for distributing optical frequencies and time stamps were researched and experimentally tested in the past fifteen years. They have been used mainly for stability comparison of experimental optical clocks. But recent development puts demands on a technology transfer from laboratory experiments to the real industry. The remote calibration of interrogators of Fibre Bragg Grating strain sensory networks is one of important examples. The first step of the adoption the time and frequency broadcasting should be the drop-out free long-term operation of this technology between research laboratories connected via long-haul fibre links. We present a 306 km long-haul optical fibre link between the cities of Prague and Brno in the Czech Republic where a coherent transfer of stable optical frequency and a stable time signal has been firstly demonstrated. The link between ISI CAS Brno and CESNET Prague uses an internet communication fibre where a window of 1540-1546 nm is dedicated for the coherent transfer and 1PPS signal. The link is equipped with 6 bidirectional EDFA amplifiers. The optical frequency standard based on the highly-coherent laser Koheras Adjustik working at 1540.5 nm and stabilized with a saturation absorption spectroscopy technique was used for the coherent wave transfer. The suppression of the Doppler shift induced by the optical fibre was based on an accoustooptical modulator with a servo-loop including a fast PID controller processing the beat-note frequency given by mixing of the Adjustik laser (Brno) and the reflected frequency of this laser from the far end of 306 km long-haul fibre link (Prague). We verified the Doppler shift suppression for the coherent wave with a measuring method analysing the transport delay of the 1PPS signal.
    Trvalý link: http://hdl.handle.net/11104/0266484

     
     
Počet záznamů: 1  

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