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Simultaneous remote transfer of accurate timing and optical frequency over a public fiber network |
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| Authors: | Olivier Lopez Amale Kanj Paul-Eric Pottie Daniele Rovera Joseph Achkar Christian Chardonnet Anne Amy-Klein Giorgio Santarelli |
| Institution: | 1. Laboratoire de Physique des Lasers, Université Paris 13, Sorbonne Paris Cité, CNRS, 99 Avenue Jean-Baptiste Clément, 93430, Villetaneuse, France 2. LNE-SYRTE, Observatoire de Paris, CNRS, UPMC, 61 Av. de l’Observatoire, 75014, Paris, France 3. Laboratoire Photonique, Numérique et Nanosciences, UMR 5298 Université de Bordeaux 1, Institut d’Optique and CNRS, 351 Cours de la Libération, 33405, Talence, France |
| Abstract: | In this work, we demonstrate for the first time that it is possible to transfer simultaneously an ultra-stable optical frequency and precise and accurate timing over 540 km using a public telecommunication optical fiber network 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 μm with spread spectrum signals using two-way satellite time transfer modems. The results in terms 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. |
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