Title | Bandwidth scaling and spectral flatness enhancement of optical frequency combs from phase modulated continuous-wave lasers using cascaded four-wave mixing |
Publication Type | Journal Article |
Year of Publication | 2012 |
Authors | Supradeepa, VR, Weiner, AM |
Journal | Optics Letters |
Volume | 37 |
Issue | 15 |
Pagination | 3066–3068 |
Abstract | 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. |
DOI | 10.1364/OL.37.003066 |