ABSTRACT In this paper we describe the improved redesign of the microwave frequency synthesizers for Laboratoire National d'Essais-Systèmes de Référence Temps-Espace (LNE-SYRTE) atomic fountains. The synthesizers use a cryogenic oscillator to generate both Cs and Rb hyperfine frequencies based on a new distribution frequency of 1 GHz. The main metrological features (phase noise, long-term phase stability, and spectral purity) of the synthesizers have been measured in situ connected to an atomic fountain and are compatible with an accuracy goal of 10-16 for the atomic fountains. The simultaneous test of two different synthesizers on the FO2 atomic fountain at the 10-16 level also is reported.
Digital Object Identifier 10.1109/TUFFC.2007.306
© 2007, by The Institute of Electrical and Electronics Engineers, Inc. All rights reserved.