Time and frequency distribution improvement in Calern/Geoazur laboratory for T2L2 campaigns

The Time Transfer by Laser Link (T2L2)[1) experiment aim to synchronise remote ultra stable clocks over large-scaled distances using two laser ranging stations. T2L2 ultimate time transfer capability can only be demonstrate with a picosecond range ground mastering. We focus this year in knowledge and equipment improvement to perform a T2L2 time transfer with accuracy and stability of a few picoseconds. A deep analysis of signals stability has been carried out this year in the time and frequency laboratory in Plateau de Calern. The aim was to better understand the limits and hardware configuration and to enhance time and frequency distribution for T2L2 experiment. We showed phase noise and stability problem on our H-maser distribution. Final measures were conducted in October in collaboration with SYRTE. Then a complete equipment reorganisation was done. This paper focus on the time and frequency laboratory characterization before and after the reorganisation. We introduce our new equipments and present our new H-maser time scale and discuss the performances obtained.