Metrological Optical Fiber Link (IMAGE) Physikalisch-Technische Bundesanstalt (PTB) Caption This image shows the metrological optical fiber link between LNE-SYRTE in Paris, France and PTB in Braunschweig, Germany, connected in Strasbourg. The overall link length is 1,400 km. Credit (Graphic: PTB) Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.