Production of an optical frequency reference signal

H - Electricity – 04 – J

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H04J 14/02 (2006.01) G01J 1/02 (2006.01) H03L 7/26 (2006.01) H04B 10/145 (2006.01) H04B 10/155 (2006.01)

Patent

CA 2267323

The production of optical frequency reference signals by means of laser diodes and atomic transition of a diluted gas, e.g. krypton isotope 84, is known. However to do this a frequency which does not lie within the ITU table of frequency allocation is produced. In order to produce a frequency reference signal of a desired frequency, a signal is produced by a second laser diode and superimposed with the first frequency reference signal to produce a differential frequency in the microwave range. A control signal derived from the differential frequency regulates the second injection laser diode with the precision of atomic krypton isotope transition.

La production de signaux optiques de référence de fréquence au moyen de diodes laser et de la transition atomique d'un gaz dilué, par ex. l'isotope krypton 84, est connue. Cependant, on obtient dans ce cas une fréquence ne se trouvant pas dans la plage d'attribution des canaux recommandée par l'UIT. En vue de la production d'un signal de référence de fréquence présentant une fréquence souhaitée, un signal est produit au moyen d'une deuxième diode laser puis superposé au premier signal de référence de fréquence pour produire une fréquence différentielle dans la plage des hyperfréquences. Un signal de régulation dérivé de la fréquence différentielle permet de réguler la deuxième diode laser avec la précision de la transition atomique de l'isotope du krypton.

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