CHIRP TAILORING IN Q-SWITCHED INGAASP LASERS USING ELECTROABSORPTION LOSS SECTION

Chirp tailoring is demonstrated in Q-switched two-section InGaAsP lase rs, with RF modulation applied to an electroabsorption section of high saturation intensity. The pulse time-bandwidth product is varied by a factor of similar to 4, by changing the DC bias of the gain section. Pulses which are almost transform-limited are obtained for the lowest biases. Gain-switching experiments performed with the same lasers only show a moderate chirp dependence with bias. The authors give theoreti cal background to interprete the different behaviours.