A high-quality low-timing-jitter 20-GHz optical pulse train is generated by using two cascaded sinusoidally driven electroabsorption modulators (EAMs) at very low bias voltage of -0.8 V in conjunction with a tunable distributed feedback (DFB) semiconductor laser. An approximate transform-limited optical pulse, with the pulse width less than 7 ps, the spectral width of 0.3 nm, and the side-mode suppression ratio (SMSR) above 20 dB, is obtained by tuning the optical delay line.
© 2007 Chinese Optics Letters
Yuanshan Liu, Jianguo Zhang, and Wei Zhao, "20-GHz optical pulse source based on cascaded electroabsorption modulators," Chin. Opt. Lett. 5, 700-702 (2007)