| Zugriffsnummer | 35053 |
| Dokumenttyp | Zeitschriftenartikel |
| Sprache | Englisch |
| Titel | Brillouin amplification supports 1×10-20 uncertainty in optical frequency transfer over 1400 km of underground fiber |
| Autor(in); Institution |
Raupach, Sebastian M. F.; Q.5, Technische Zusammenarbeit, PTB-Braunschweig
Koczwara, Andreas; 4.3, Quantenoptik und Längeneinheit, PTB-Braunschweig
Grosche, Gesine; 4.3, Quantenoptik und Längeneinheit, PTB-Braunschweig
|
| Quelle/Jahr | Physical Review A: 92 (2015), 2, 021801-1 - 021801-5 |
| ISSN | 1050-2947 (PRINT) ; 1094-1622 (ONLINE) |
| DOI | |
| URL | |
| Verlag | College Park, Md.: American Physical Society |
| Klassifikationscode | PACS: 42.60.Da ; PACS: 06.30.Ft ; PACS: 06.20.fb |
| Freie Schlagworte | fiber Brillouin amplifiers ; optical frequency transfer |
| Zusammenfassung | We investigate optical frequency transfer over a 1400 km loop of underground fiber connecting Braunschweig and Strasbourg. Largely autonomous fiber Brillouin amplifiers are the only means of intermediate amplification used here. This allows phase-continuous measurements over periods up to several days. Over a measurement period of about three weeks we find a weighted mean of the transferred frequency's fractional offset of (1.1±0.4)×10-20. In the best case we find an instability of 6.9×10-21 and a fractional frequency offset of 4.4×10-21 at an averaging time of around 30 000 s. These results represent an upper limit for the uncertainty over 1400 km when using a chain of remote Brillouin amplifiers, and allow one to compare the world's best optical clocks. |
