T 2 L 2 – Time Transfer by Laser

The new generation of optical time transfer T2L2 [1,2] (Time Transfer by Laser Link) has recently been accepted as a passenger of the Jason 2 satellite. The main objective of T2L2 on Jason2 is to compare remote clocks on earth. The project will also permit to follow-up from the ground, the on board clock of the DORIS System. The performances expected are enhanced by one or two order of magnitudes as compared to existing microwave time transfer techniques, like GPS and TWSTFT. After a description of the space instrumentation principle, we will present the metrological performances and give the current status of the project. Jason 2 will be launched in 2008 for a nominal mission duration of 3 years (5 expected) .