1209.4715 (Olivier Lopez et al.)

Simultaneous remote transfer of accurate timing and optical frequency
over a public fiber network    [PDF]

Olivier Lopez, Amale Kanj, Paul-Eric Pottie, Giovanni D. Rovera, Joseph Achkar, Christian Chardonnet, Anne Amy-Klein, Giorgio Santarelli

In this work we demonstrate for the first time that it is possible to transfer simultaneously an ultra-stable optical frequency and a precise and accurate timing over 540 km using a public telecommunication optical fiber networks with Internet data. The optical phase is used to carry both the frequency information and the timestamps by modulating a very narrow optical carrier at 1.55 $\mu$m with spread spectrum signals using two-way satellite time transfer modems. The results in term of absolute time accuracy (250 ps) and long-term timing stability (20 ps) well outperform the conventional Global Navigation Satellite System or geostationary transfer methods.

View original: http://arxiv.org/abs/1209.4715