A maintenance-free solution for optical frequency transfer

• Autorzy: Włodarczyk Przemysław , Krehlik Przemysław , Śliwczyński Łukasz

Identyfikatory

DOI

10.24425/mms.2020.134586

• Języki publikacji: EN

Abstrakty

EN

This paper focuses on automatic locking of tracking filters used in optical frequency transfer systems. General concept of such a system is briefly described and the problems with its automatic startup, originating in the use of the analog phase locked loop to filter weak, received signal, are discussed. A supervisory circuitry and algorithm to solve these problems is proposed. The frequency of the signal to be filtered is measured indirectly and the output frequency of the tracking filter is monitored. In the case of lack of synchronism (i.e. after the startup) a significant difference of these frequencies is measured and the supervisory algorithm forces the filter to tune into the right frequency and then allows it to synchronize. A system with the proposed solution was implemented and tested experimentally on a fiber optic link with high attenuation and multiple optical connectors. Transient signals during locking were recorded to investigate the system’s behavior in real environment. The system was evaluated in the link causing synchronization losses every 17 min on average. During measurements over 3 days, the whole system was synchronized for over 99.98% of time despite these difficult conditions.

Słowa kluczowe

EN

fiber-optics; optical frequency transfer; tracking filter; automatic startup

• Wydawca: Komitet Metrologii i Aparatury Naukowej PAN
• Czasopismo: Metrology and Measurement Systems
• Rocznik: 2020
• Tom: Vol. 27, nr 3
• Strony: 441--450
• Opis fizyczny: Bibliogr. 17 poz., rys., wykr., wzory

Twórcy

autor

Włodarczyk Przemysław

• AGH University of Science and Technology, Faculty of Computer Science, Electronics and Telecommunications, al. A. Mickiewicza 30, 30-059 Kraków, Poland

autor

Krehlik Przemysław

• AGH University of Science and Technology, Faculty of Computer Science, Electronics and Telecommunications, al. A. Mickiewicza 30, 30-059 Kraków, Poland

autor

Śliwczyński Łukasz

• AGH University of Science and Technology, Faculty of Computer Science, Electronics and Telecommunications, al. A. Mickiewicza 30, 30-059 Kraków, Poland

Bibliografia

• [1] Ludlow, A.D., Boyd, M. M., Ye, J., Peik, E., Schmidt, P.O. (2015). Optical atomic clocks. Reviews of Modern Physics, 87(2), 637-701.
• [2] Huntemann, N., Sanner, C., Lipphardt, B., Tamm, C., Peik, E. (2016). Single-ion atomic clock with 3x10-18 systematic uncertainty. Physical Review Letters, 116(6), 063001.
• [3] Riehle, F. (2017). Optical clock networks. Nature Photonics, 11(1), 25-31.
• [4] Foreman, S.M., Holman, K.W., Hudson, D.D., Jones, D.J., Ye, J. (2007). Remote transfer of ultrastable frequency references via fiber networks. Review of Scientific Instruments, 78(2), 021101.
• [5] Williams, P.A., Swann, W.C., Newbury, N.R. (2008). High-stability transfer of an optical frequency over long fiber-optic links. Journal of the Optical Society of America B, 25(8), 1284-1293.
• [6] Newbury, N.R., Williams, P.A., Swann, W.C. (2007). Coherent transfer of an optical carrier over 251 km. Optics Letters, 32(21), 3056-3058.
• [7] Droste, S., Ozimek, F., Udem, T., Predehl, K., Hänsch, T.W., Schnatz, H., Grosche, G., Holzwarth, R. (2013). Optical-frequency transfer over a single-span 1840 km fiber link. Physical Review Letters, 111(11), 110801.
• [8] Lopez, O., Haboucha, A., Chanteau, B., Chardonnet, C., Amy-Klein, A., Santarelli, G. (2012). Ultrastable long distance optical frequency distribution using the Internet fiber network. Optics Express, 20(21), 23518-23526.
• [9] Lopez, O., Kanj, A., Pottie, P. E., Rovera, D., Achkar, J., Chardonnet, C., Amy-Klein, A., Santarelli, G. (2013). Simultaneous remote transfer of accurate timing and optical frequency over a public fiber network. Applied Physics B, 110(1), 3-6.
• [10] Krehlik, P., Schnatz, H., Śliwczyński, Ł. (2017). A hybrid solution for simultaneous transfer of ultra-stable optical frequency, RF frequency, and UTC time-tags over optical fiber. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 64(12), 1884-1890.
• [11] Lopez, O., et al. (2015). Frequency and time transfer for metrology and beyond using telecommunication network fibres. Comptes Rendus Physique, 16(5), 531-539.
• [12] Giorgetta, F.R., Swann, W.C., Sinclair, L.C., Baumann, E., Coddington, I., Newbury, N.R. (2013). Optical two-way time and frequency transfer over free space. Nature Photonics, 7(6), 434-438.
• [13] Kang, H.J., Yang, J., Chun, B.J., Jang, H., Kim, B.S., Kim, Y.J., Kim, S.W. (2019). Free-space transfer of comb-rooted optical frequencies over an 18 km open-air link. Nature Communications, 10, 4438.
• [14] Guillou-Camargo, F., et al. (2018). First industrial-grade coherent fiber link for optical frequency standard dissemination. Applied Optics, 57(25), 7203-7210.
• [15] Ma, L.S., Jungner, P., Ye, J., Hall, J.L. (1994). Delivering the same optical frequency at two places: accurate cancellation of phase noise introduced by an optical fiber or other time-varying path. Optics Letters, 19(21), 1777-1779.
• [16] Wang, G., Yao, Y., Yan, T., Bian, L., Meng, Y. (2019). A new optical frequency transfer method via fibre based on active phase noise compensation with single acousto-optic modulator. Metrology and Measurement Systems, 26(1), 115-124.
• [17] Gardner, F.M. (1979). Phaselock Techniques, Second Edition. John Wiley & Sons, Inc.

Uwagi

EN

1. This work was supported by the TiFOON 18SIB06 project. The TiFOON project has received funding from the EMPIR program co-financed by the Participating States and from the European Union’s Horizon 2020 research and innovation program.

PL

2. Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).