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

Scott A. Diddams | Zendy; Michal Kirchner | Zendy; Tara M. Fortier | Zendy; Danielle Braje | Zendy; Andrew M. Weiner | Zendy; L. Hollberg | Zendy

Open Access

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

Author(s) -

Scott A. Diddams,

Michal Kirchner,

Tara M. Fortier,

Danielle Braje,

Andrew M. Weiner,

L. Hollberg

Publication year - 2009

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.17.003331

Subject(s) - optics , phase noise , frequency comb , materials science , noise (video) , laser , relative intensity noise , microwave , comb filter , noise floor , physics , semiconductor laser theory , noise reduction , bandwidth (computing) , noise measurement , telecommunications , acoustics , computer science , quantum mechanics , artificial intelligence , image (mathematics)

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.

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