《oe-20-21-23518-ultrastable-frequency-distribtion》.pdf

Ultra-stable long distance optical frequency distribution using the Internet fiber network 1 2 1 1 Olivier Lopez, Adil Haboucha, Bruno Chanteau, Christian Chardonnet, Anne Amy- Klein,1 and Giorgio Santarelli2,3,* 1Laboratoire de Physique des Lasers, Université Paris 13, Sorbonne Paris Cité, CNRS, 99 Avenue Jean-Baptiste Clément, 93430 Villetaneuse, France 2Laboratoire National de Métrologie et d’Essais–Système de Références Temps-Espace, UMR 8630 Observatoire de Paris, CNRS, UPMC, 61 Avenue de l’Observatoire, 75014 Paris, France 3Laboratoire Photonique, Numérique et Nanosciences, UMR 5298 Université de Bordeaux 1, Institut d’Optique and CNRS, 351 cours de la Libération, 33405 Talence, France * giorgio.santarelli@institutoptique.fr Abstract: We report an optical link of 540 km for ultrastable frequency distribution over the Internet fiber network. The stable frequency optical signal is processed enabling uninterrupted propagation on both directions. The robustness and the performance of the link are enhanced by a cost effective fully automated optoelectronic station. This device is able to coherently regenerate the return optical signal with a heterodyne optical phase locking of a low noise laser diode. Moreover the incoming signal polarization variation are tracked and processed in order to maintain beat note amplitudes wi