Validating frequency transfer via interferometric fiber links for optical clock comparisons

verfasst von
Sebastian Koke, Erik Benkler, Alexander Kuhl, Gesine Grosche
Abstract

We investigate the validation of fiber-based optical frequency transfer for frequency comparison applications. We specifically consider the frequency transfer validation for remote optical clock comparisons and want to ensure interferometric fiber link uncertainty contributions below the combined uncertainty of the clocks under test. The validation is based on signals obtained via looping back from the remote end to the sender site and comparing the input with the output of the loop. These loop-back data need to be averaged over intervals for reaching the validation goal, as the short-term instability of long-distance interferometric fiber links is typically higher than that of optical clocks. We introduce a two-step validation approach and address the finding of a compromise between opposing aspects of averaging: reaching low uncertainties versus achieving a high data coverage of the validated data set via a high temporal resolution of the fault identification. We discuss the impact of different averaging types and of the tolerance of filtering criteria on the achievable estimated uncertainty and on the coverage of the validated data set. Data from four multiple-week-long measurement campaigns on the fiber link between Physikalisch-Technische Bundesansanstalt and University of Strasbourg are used for this assessment.

Organisationseinheit(en)
QuantumFrontiers
SFB 1464: Relativistische und quanten-basierte Geodäsie (TerraQ)
Externe Organisation(en)
Physikalisch-Technische Bundesanstalt (PTB)
Typ
Artikel
Journal
New journal of physics
Band
23
ISSN
1367-2630
Publikationsdatum
20.09.2021
Publikationsstatus
Veröffentlicht
Peer-reviewed
Ja
ASJC Scopus Sachgebiete
Physik und Astronomie (insg.)
Elektronische Version(en)
https://doi.org/10.1088/1367-2630/ac21a0 (Zugang: Offen)