Efficient single-mode Brillouin fiber laser for low-noise optical carrier reduction of microwave signals.
We experimentally demonstrate efficient optical carrier reduction of microwave signals with a single-mode 1.5-microm wavelength Brillouin all-fiber ring laser. Because of the tunable optical coupling, the lasing threshold of the short-length (20-m) fiber cavity is lower than 5 mW, and high conversion efficiencies (up to 60%) are obtained at any pump power up to approximately 200 mW. Using the single-mode Stokes beam as a seed for the stimulated Brillouin scattering process allows up to 40-dB optical carrier depletion with almost no added noise for an optically carried microwave signal at 6 GHz. In addition, using this resonator, we provide evidence of generation of high-spectral-purity beatnotes.
Thales Research & Technology, Domaine de Corbeville, 91404 Orsay cedex, France. stephanie.norcia@thalegroup.com
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Norcia
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Tonda-Goldstein
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D
Dolfi
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JP
Huignard
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R
Frey