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Frequency stability and phase noise of an improved X-band cryocooled sapphire oscillator

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2 Author(s)
Nand, N.R. ; Sch. of Phys., Univ. of Western Australia, Crawley, WA, Australia ; Hartnett, J.G.

A previously implemented cryogenic sapphire oscillator (CSO) based on a commercial cryocooler has been modified and its frequency stability and phase noise re-measured against a nominally similar liquid helium cooled CSO in the same laboratory. Assuming both contribute equally, their frequency stability and phase noise have been evaluated. We report for the oscillator a minimum Allan deviation of 3.9 × 10-16 at 20 s, a long-term frequency drift less than 1 × 10-14/day, and a measured single sideband phase noise of -97 dBc/Hz at 1 Hz offset from the carrier. The stated performance of the cryocooled CSO is adequate for it to be deployed at a local VLBI site for comparison against the hydrogen maser which is the current reference standard.

Published in:

Frequency Control Symposium (FCS), 2010 IEEE International

Date of Conference:

1-4 June 2010