Ultra-low phase noise frequency synthesis chains for High-performance vapor cell atomic clocks
| Affiliation auteurs | !!!! Error affiliation !!!! |
| Titre | Ultra-low phase noise frequency synthesis chains for High-performance vapor cell atomic clocks |
| Type de publication | Conference Paper |
| Year of Publication | 2015 |
| Auteurs | Francois B., Boudot R., Calosso C.E, Danet J.M |
| Conference Name | 2015 JOINT CONFERENCE OF THE IEEE INTERNATIONAL FREQUENCY CONTROL SYMPOSIUM & THE EUROPEAN FREQUENCY AND TIME FORUM (FCS) |
| Publisher | IEEE; UFFC; EFTF |
| Conference Location | 345 E 47TH ST, NEW YORK, NY 10017 USA |
| ISBN Number | 978-1-4799-8866-2 |
| Résumé | This paper presents the development of a 9.192 GHz microwave frequency synthesis chain (absolute and residual noise characterization) dedicated to be a local oscillator (LO) in a high-performance cesium vapor cell atomic clock based on coherent population trapping (CPT). The key components are an ultra low noise oven controlled quartz crystal oscillator (OCXO), multiplied to 9.2 GHz using a non-linear transmission line. A dielectric resonator oscillator (DRO) is phase-locked onto the microwave signal to generate the 9.192 GHz frequency. The absolute phase noise of the LO has been characterized at the level of -42, -100, -117 dBrad(2)/Hz and -129 dBrad(2)/Hz at 1 Hz, 100 Hz, 1 kHz and 10 kHz offset frequencies respectively. With such performances, the expected Dick effect contribution to the atomic clock short term frequency stability is reported to 6.2 x 10(14) at 1 s integration time. Main limitations are pointed out. |