Title :
Synthesis chains based on ultra-stable cryogenic sapphire oscillator at NICT
Author :
Kumagai, Motohiro ; Ito, Hiroyuki ; Nagano, Shigeo ; Hosokawa, Mizuhiko ; Santarelli, Giorgio ; Locke, Clayton R. ; Hartnett, John G.
Author_Institution :
Nat. Inst. of Inf. & Commun., Technol. (NICT), Tokyo, Japan
Abstract :
A synthesis chain based on a cryogenic sapphire oscillator (CSO) has been developed at NICT. The 11.2005 GHz output of the CSO is down-converted to 1-GHz for laboratory distribution. The short-term frequency stability of the down-converter itself is better than 1 times 10-15 at an averaging time of 1 second. The long-term drift of the CSO is suppressed by referencing it to a hydrogen maser linked to Japan Standard Time. For microwave interrogation to the cesium atom, a 9.192-GHz up-converter was developed.
Keywords :
caesium; cryogenics; crystal oscillators; frequency stability; sapphire; NICT; cesium atom; frequency 11.2005 GHz; frequency 9.192 GHz; microwave interrogation; short-term frequency stability; synthesis chains; ultra-stable cryogenic sapphire oscillator; Cryogenics; Frequency synthesizers; Helium; Hydrogen; Local oscillators; Masers; Signal synthesis; Stability; Temperature; Voltage-controlled oscillators;
Conference_Titel :
Frequency Control Symposium, 2009 Joint with the 22nd European Frequency and Time forum. IEEE International
Conference_Location :
Besancon
Print_ISBN :
978-1-4244-3511-1
Electronic_ISBN :
1075-6787
DOI :
10.1109/FREQ.2009.5168229
