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Conference on Lasers and Electro-Optics

A 500 km optical fiber link with six remotely controlled optical amplifiers for frequency comparison between MPQ and PTB

Katharina Predehl, Jānis Alnis, Thomas Udem, Theodor W. Hänsch, Ronald Holzwarth, Osama Terra, H. Schnatz

Published Jan 1, 2010• 2 citations
Publisher

Abstract

Author: Predehl, Katharina et al.; Genre: Conference Paper; Issued: 2010; Title: A 500 km optical fiber link with six remotely controlled optical amplifiers for frequency comparison between MPQ and PTB
DOI
10.1364/cleo.2010.ctudd1

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Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text K. Predehl, R. Holzwarth, T. Udem, T. Hänsch, O. Terra, G. Grosche, B. Lipphardt, and H. Schnatz, "Ultra Precise Frequency Dissemination across Germany – Towards a 900 km Optical Fiber Link from PTB to MPQ," in Conference on Lasers and Electro-Optics/International Quantum Electronics Conference, OSA Technical Digest (CD) (Optica Publishing Group, 2009), paper CTuS2. Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save article
We have explored the performance of 2 "dark fibers" of a commercial telecommunication fiber link for a remote comparison of optical clocks. These fibers establish a network in Germany that will eventually link optical frequency standards at PTB with those at the Institute of Quantum Optics (IQ) at the Leibniz University of Hanover, and the Max Planck Institutes in Erlangen (MPL) and Garching (MPQ). We demonstrate for the first time that within several minutes a phase coherent comparison of clock lasers at the few 10(-15) level can also be accomplished when the lasers are more than 100 km apart. Based on the performance of the fiber link to the IQ, we estimate the expected stability for the link from PTB to MPQ via MPL that bridges a distance of approximately 900 km.
We have explored the performance of two ldquodark fibersrdquo of a commercial telecommunication fiber link for a remote comparison of optical clocks. These fibers establish a network in Germany that will eventually link optical frequency standards at PTB with those at the Institute of Quantum Optics (IQ) at the Leibniz University of Hanover, and the Max Planck Institutes in Erlangen (MPL) and Garching (MPQ). We demonstrate for the first time that within several minutes a phase coherent comparison of clock lasers at the few 10-15level can also be accomplished when the lasers are more than 100 km apart. Based on the performance of the fiber link to the IQ we estimate the expected stability for the link from PTB to MPQ via MPL that bridges a distance of approximately 900 km.