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Opt Lett. 2005 Mar 15;30(6):667-9.

Femtosecond-laser-based synthesis of ultrastable microwave signals from optical frequency references.

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1
Time and Frequency Division, National Institute of Standards and Technology, Boulder, Colorado 80305, USA. bartels@gigaoptics.com

Abstract

We use femtosecond laser frequency combs to convert optical frequency references to the microwave domain, where we demonstrate the synthesis of 10-GHz signals having a fractional frequency instability of < or =3.5 x 10(-15) at a 1-s averaging time, limited by the optical reference. The residual instability and phase noise of the femtosecond-laser-based frequency synthesizers are 6.5 x 10(-16) at 1 s and -98 dBc/Hz at a 1-Hz offset from the 10-GHz carrier, respectively. The timing jitter of the microwave signals is 3.3 fs.

PMID:
15792011
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