Passive mode-locking of monolithic InGaAs/AlGaAs double quantum well lasers at 42 GHz repetition rate

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Abstract
Pulse trains with a 42 GHz repetition rate were generated by monolithic InGaAs/AlGaAs double quantum well lasers at a wavelength of 9850 Å. The cavity was electrically divided into three regions, one providing gain and the other two providing saturable absorption. The optical modulation has a depth greater than 98% and full-width at half-maximum under 6 ps, and bias conditions for sustained mode-locking are determined.