title: Ultra-stable long distance optical frequency distribution using the Internet fiber network.
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 within the operation range. Stable fibered optical interferometer enables optical detection of the link round trip phase signal. The phase-noise compensated link shows a fractional frequency instability in 10 Hz bandwidth of 5 × 10(-15) at one second measurement time and 2 × 10(-19) at 30,000 s. This work is a significant step towards a sustainable wide area ultrastable optical frequency distribution and comparison network.
authors.affiliation: Laboratoire de Physique des Lasers, Université Paris 13, Sorbonne Paris Cité, CNRS, 99 Avenue Jean-Baptiste Clément, 93430 Villetaneuse, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Lopez
authors.forename: Adil
authors.initials: A
authors.lastname: Haboucha
authors.forename: Bruno
authors.initials: B
authors.lastname: Chanteau
authors.forename: Christian
authors.initials: C
authors.lastname: Chardonnet
authors.forename: Anne
authors.initials: A
authors.lastname: Amy-Klein
authors.forename: Giorgio
authors.initials: G
authors.lastname: Santarelli
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D020407:Internet / Q000295:instrumentation*; D054023:Lasers, Semiconductor; D055100:Optical Fibers