| Zugriffsnummer | 41882 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | mit Peer Review |
| Sprache | Englisch |
| Titel | Calibrated optical time transfer of UTC(k) for supervision of telecom networks |
| Autor(in); Institution |
Sliwczynski, L.; AGH University of Science and Technology, Faculty of Computer Science, Electronics and Telecommunications, Krakow, POLAND
Krehlik, P.; AGH University of Science and Technology, Faculty of Computer Science, Electronics and Telecommunications, Krakow, POLAND
Kolodziej, J.; AGH University of Science and Technology, Faculty of Computer Science, Electronics and Telecommunications, Krakow, POLAND
Schnatz, Harald; 4.3, Quantenoptik und Längeneinheit, PTB-Braunschweig
Piester, Dirk; 4.4, Zeit und Frequenz, PTB-Braunschweig
Bauch, Andreas; 4.4, Zeit und Frequenz, PTB-Braunschweig
Imlau, H.; Deutsche Telekom Technik GmbH, FMED, Bremen, GERMANY
Ender, H.; Deutsche Telekom Technik GmbH, FMED, Bremen, GERMANY
|
| Quelle/Jahr | Metrologia: 56 (2019), 1, 1 - 13 |
| Artikelnummer | 015006 |
| ISSN | 0026-1394 (print) ; 1681-7575 (online) |
| DOI | |
| Verlag | Bristol: IOP Publishing |
| Freie Schlagworte | time transfer ; frequency transfer ; fiber optic ; propagation delay calibration ; uncertainty budget ; telecom network supervision |
| Zusammenfassung | We report on the evaluation of the performance of optical time transfer links connecting a facility of Deutsche Telekom in Bremen with the Physikalisch-Technische Bundesanstalt in Braunschweig. In the current configuration three links have been established, two via a hub in Hannover and one using an independent alternate route. They are equipped with electronically stabilized fiber optic time and frequency transfer systems and parallel operation is maintained since December 2016. A novel method of link calibration, composed of two steps (one performed in the laboratory and the second one in the field), to accurately determine the influence of fiber chromatic dispersion is discussed in detail, and a thorough analysis of the uncertainty budget is given. We show that the time transfer performance achieved is difficult to characterize based on measurements with time interval counters that are the standard equipment in timing laboratories and in the telecommunications sector. In our experiments, values of TDEV at the low ps-level at averaging times between 104 to 106 s have been achieved. The uncertainty of time transfer (including all kinds of delays) is of the order of 50 ps in a cascade of links. The results obtained show that such a kind of link is capable to deliver signals to a remote end with an instability being at least two orders of magnitude below the current requirements included in relevant Recommendations of the International Telecommunication Union-Telecommunication Sector (ITU-T). Moreover, the current implementation would allow primary Cs fountain clocks to be compared at the level of their performance, that is characterized by an uncertainty at the low 10-16 level and a frequency instability of the same order of magnitude at 1 d averaging. |
| Themenbereich der Metrologie | Zeit und Frequenz |
| Förderinformationen (1) |
Förderername: Polish National Science Center
Förderungsnummer: 2014/15/B/ST7/00471 ; 2015/17/B/ST7/03628 |
| Förderinformationen (2) |
Förderername: European Commission (EC)
Förderer ID: 0000 0001 2242 8989 Förderer ID Typ: ISNI Förderprogramm: EMPIR 2015 SI Broader Scope Titel der Förderung: 15SIB05: OFTEN: Optical frequency transfer - a European network Förderungsnummer: 15SIB05 |