Journal
OPTICS LETTERS
Volume 37, Issue 15, Pages 3066-3068Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.37.003066
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Funding
- National Science Foundation [ECCS-1102110]
- Naval Postgraduate School under the National Security Science and Engineering Faculty Fellowship program [N00244-09-1-0068]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1102110] Funding Source: National Science Foundation
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We introduce a new cascaded four-wave mixing technique that scales up the bandwidth of frequency combs generated by phase modulation of a continuous-wave (CW) laser while simultaneously enhancing the spectral flatness. As a result, we demonstrate a 10 GHz frequency comb with over 100 lines in a 10 dB bandwidth in which a record 75 lines are within a flatness of 1 dB. The cascaded four-wave mixing process increases the bandwidth of the initial comb generated by the modulation of a CW laser by a factor of five. The broadband comb has approximately quadratic spectral phase, which is compensated upon propagation in single-mode fiber, resulting in a 10 GHz train of 940 fs pulses. (C) 2012 Optical Society of America
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