Monolithic 40-GHz Passively Mode-Locked AlGaInAs–InP 1.55-$\mu$m MQW Laser With Surface-Etched Distributed Bragg Reflector

We have fabricated 40-GHz passively mode-locked AlGaInAs-InP 1.55- lasers integrated with surface-etched distributed Bragg mirrors. Numerically optimized gratings provide low-scattering losses and accurate wavelength control. The lasers produce 4.46-ps Gaussian pulses with time-bandwidth product of 0.47.