Advanced time/frequency comparison and dissemination through optical telecommunication networks

Short Name: TiFOON, Project Number: 18SIB06
Fiber optics

Developing time scales to harness the superior performance of optical clocks

Time and frequency measurements are vital in many areas of science, industry and trade. Satellite navigation, for instance, is made possible by atomic timekeeping. The forthcoming optical definition of the SI second, spurred by innovations in optical atomic clocks, could, among other benefits, lead to millimetre-precision positioning. Agreement between clocks requires reliable communication of time and frequency signals, but for affordability these signals need to be able to use commercial fibre networks.


The previous NEAT-FT and OFTEN projects culminated in the first international optical clock comparison at the level of uncertainty of the clocks themselves. On the way to a universal tool, this project will refine techniques for transferring data over shared fibreoptic networks, by improving phase coherence and automated link management. Novel applications will be investigated, with geodesy (the Earth’s shape, position and gravitational field) used as an example application. International time scales, synchronised over shared fibre networks, are expected to lead to novel time-keeping concepts with order-of-magnitude improvements in accuracy.

Project website
Other Participants
Akademia Gorniczo-Hutnicza im. Stanislawa Staszica w Krakowie (Poland)
Centre National de la Recherche Scientifique (France)
CESNET Zajmove Sdruzeni Pravnickych OSOB (Czech Republic)
Instytut Chemii Bioorganicznej, Polskiej Akademii Nauk (Poland)
Muquans (France)
Politecnico di Torino (Italy)
Technische Universität München (Germany)
Ústav přístrojové techniky AV ČR, v.v.i. (Czech Republic)