期刊
NATURE PHOTONICS
卷 5, 期 12, 页码 770-776出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nphoton.2011.255
关键词
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资金
- National Science Foundation [ECCS-0925759, ECCS-1102110]
- Naval Postgraduate School [N00244-09-1-0068]
- National Security Science and Engineering Faculty
- NIST-CNST/UMD-NanoCenter Cooperative Agreement
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1102110] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [0925759] Funding Source: National Science Foundation
Recently, on-chip comb generation methods based on nonlinear optical modulation in ultrahigh-quality-factor monolithic microresonators have been demonstrated, where two pump photons are transformed into sideband photons in a four-wave-mixing process mediated by Kerr nonlinearity. Here, we investigate line-by-line pulse shaping of such combs generated in silicon nitride ring resonators. We observe two distinct paths to comb formation that exhibit strikingly different time-domain behaviours. For combs formed as a cascade of sidebands spaced by a single free spectral range that spread from the pump, we are able to compress stably to nearly bandwidth-limited pulses. This indicates high coherence across the spectra and provides new data on the high passive stability of the spectral phase. For combs where the initial sidebands are spaced by multiple free spectral ranges that then fill in to give combs with single free-spectral-range spacing, the time-domain data reveal partially coherent behaviour.
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