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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 5 — Mar. 2, 2009
  • pp: 3331–3340

Improved signal-to-noise ratio of 10 GHz microwave signals generated with a mode-filtered femtosecond laser frequency comb

S. A. Diddams, M. Kirchner, T. Fortier, D. Braje, A. M. Weiner, and L. Hollberg  »View Author Affiliations

Optics Express, Vol. 17, Issue 5, pp. 3331-3340 (2009)

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We use a Fabry-Perot cavity to optically filter the output of a Ti:sapphire frequency comb to integer multiples of the original 1 GHz mode spacing. This effectively increases the pulse repetition rate, which is useful for several applications. In the case of low-noise microwave signal generation, such filtering leads to improved linearity of the high-speed photodiodes that detect the mode-locked laser pulse train. The result is significantly improved signal-to-noise ratio at the 10 GHz harmonic with the potential for a shot-noise limited single sideband phase noise floor near -168 dBc/Hz.

© 2009 Optical Society of America

OCIS Codes
(320.7160) Ultrafast optics : Ultrafast technology
(350.4010) Other areas of optics : Microwaves
(250.0040) Optoelectronics : Detectors

ToC Category:
Ultrafast Optics

Original Manuscript: September 29, 2008
Revised Manuscript: January 17, 2009
Manuscript Accepted: January 30, 2009
Published: February 18, 2009

S. A. Diddams, M. Kirchner, T. Fortier, D. Braje, A. M. Weiner, and L. Hollberg, "Improved signal-to-noise ratio of 10 GHz microwave signals generated with a mode-filtered femtosecond laser frequency comb," Opt. Express 17, 3331-3340 (2009)

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