Abstract

Active, passive, and hybrid mode-locking have been demonstrated in a monolithic extended-cavity semiconductor laser with an integrated saturable absorber. A 45-µm long reverse-biased segment of multiple quantum wells acts as the saturable absorber. Active and hybrid mode-locking at a repetition rate of 8.6 GHz, resulted in 6.2-ps and 4.4-ps pulses. The extended-cavity laser also exhibits self-starting passive mode-locking at a repetition rate of 8.57 GHz with 5.5 ps pulses. Wavelength selectivity over a range of 15 nm with little change in the pulse width is facilitated by a broad spectrum.

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