Cryogenic-Sapphire-Oscillator-Based Reference Signal at 1 GHz with 10-15

K.I. Watabe, S. Yanagimachi, A. Takamizawa, T. Ikegami, S. Ohshima, G. Santarelli, Clayton Locke, John Hartnett

Research output: Contribution to journalArticle

6 Citations (Scopus)


We describe a 1 GHz reference signal with 10(-15) level fractional frequency stability for averaging times longer than 1s, synthesized from a 10.8 GHz oscillation frequency of a cyrogenic-sapphire-resonator-based ultra-stable oscillator and phase locked to a hydrogen maser with a time constant of about 1000s. The degradation of the short term stability of the reference signal by phase locking to the hydrogen maser was evaluated. We also report on the implementation of the 1 GHZ signal down converted to 5 MHz as a reference oscillator for a cesium atomic fountain frequency standard.
Original languageEnglish
Pages (from-to)7390-7392
JournalJapanese Journal of Applied Physics
Issue number9
Publication statusPublished - 2008

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