Dataset for "International Optical Clock Comparison Using the European Optical Fiber Network"

This dataset contains results from the comparison of optical clocks in Europe carried out in March 2023 using the European optical fiber network. The results are reported in this arXiv.

The involved optical clocks are:

LNE-OP Hg optical lattice clock SYRTE-Hg,

PTB Yb+(E2) ion clock PTB-Yb1E2,

NPL Yb+(E3) ion clock NPL-E3Yb+3,

PTB Yb+(E3) ion clock PTB-Yb1E3, 

INRIM Yb optical lattice clock IT-Yb1,

NPL Sr optical lattice clock NPL-Sr1,

PTB Sr optical lattice clock PTB-Sr3.

Data is organized in folders, one for each comparison.  Data is reported as fractional frequency ratios on a 1-s grid. The data follows the optical link data format developed for the EMPIR Projects OFTEN and ROCIT, and the European Partnership on Metrology Project TOCK. Timetags are reported in modified Julian date (MJD). A validity flag is given where 0 = invalid, valid otherwise. Each folder includes a yaml file with metadata required for generalized data processing. A Python package that can be used for data processing can be found on github. Inconsistencies have been observed in parts of the data; users should refer to the arXiv for details and interpretation.