Chip-based frequency combs with sub-100 GHz repetition rates

By fabricating high-Q silicon-nitride spiral resonators, we demonstrate frequency combs spanning over 200 nm with free spectral ranges (FSRs) of 80, 40, and 20 GHz using cascaded four-wave mixing. We characterize the RF beat note for the 20 GHz FSR comb, and the measured linewidth of 3.6 MHz is cons...

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Bibliographic Details
Published in:Optics letters 2012-03, Vol.37 (5), p.875-877
Main Authors: Johnson, Adrea R, Okawachi, Yoshitomo, Levy, Jacob S, Cardenas, Jaime, Saha, Kasturi, Lipson, Michal, Gaeta, Alexander L
Format: Article
Language:English
Subjects:
Amplitudes
Electronics
Fluctuation
Four-wave mixing
Joining
Pumps
Resonators
Spectra
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Summary:By fabricating high-Q silicon-nitride spiral resonators, we demonstrate frequency combs spanning over 200 nm with free spectral ranges (FSRs) of 80, 40, and 20 GHz using cascaded four-wave mixing. We characterize the RF beat note for the 20 GHz FSR comb, and the measured linewidth of 3.6 MHz is consistent with thermal fluctuations in the resonator due to amplitude noise of the pump source. These combs represent an important advance towards developing a complementary metal-oxide-semiconductor (CMOS)-based system capable of linking the optical and electronic regimes.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.37.000875