Title :
Frequency stability of cell-based passive frequency standards: reducing the effects of local-oscillator PM noise
Author :
Deng, J.Q. ; De Marchi, A. ; Walls, F.L. ; Drullinger, R.E.
Author_Institution :
Efratom Time & Frequency Products, Datum Inc., Irvine, CA, USA
Abstract :
Experimental measurements in our present diode-laser-pumped Rb buffer-gas-cell frequency standard show that the sensitivity to microwave PM noise is approximately a factor of 10 lower when square-wave modulation is used in place of the more traditional sine-wave modulation. This result virtually eliminates what had been a serious limitation to the frequency stability attainable in cell-type standards. It also has ramifications for low-cost, commercial standards
Keywords :
atomic clocks; electron device noise; frequency stability; frequency standards; microwave measurement; phase modulation; phase noise; rubidium; Rb; Rb frequency standard; buffer-gas-cell frequency standard; cell-based passive frequency standards; cell-type standards; commercial standards; diode laser pumped standard; frequency stability; local-oscillator PM noise; microwave PM noise; sensitivity; sine-wave modulation; square-wave modulation; 1f noise; Demodulation; Frequency conversion; Frequency measurement; Frequency modulation; Laser noise; Laser stability; Noise measurement; Noise reduction; Phase modulation;
Conference_Titel :
Frequency Control Symposium, 1998. Proceedings of the 1998 IEEE International
Conference_Location :
Pasadena, CA
Print_ISBN :
0-7803-4373-5
DOI :
10.1109/FREQ.1998.717887
