Passively modelocked 15, 20 and 40 Ghz bulk InGaAsP lasers

Passively modelocked linear lasers have been fabricated using bulk InGaAsP/InP material. Modelocking in 20 GHz self colliding pulse modelocked lasers and 40 GHz colliding pulse lasers has been demonstrated and the devices have been characterized. Pulse lengths down to 1.6 ps have been observed from a linear device at 20GHz. 15GHz modelocked ring lasers have been fabricated as well. In order to avoid internal reflections in the ring, the design employs successfully adiabatic bends and a directional coupler. Measurements with a 50GHz RF analyzer showed more stable operation than the linear devices, but pulses are highly chirped. The layer stack used for these lasers is compatible with our active-passive integration scheme