Transmission of an optical frequency through a 3 km long optical fiberB. de Beauvoir, F. Nez, L. Hilico, L. Julien, F. Biraben, B. Cagnac, J. J. Zondy, D. Touahri, O. Acef and A. ClaironEur. Phys. J. D, 1 2 (1998) 227-229DOI: https://doi.org/10.1007/s100530050085