Optical loss and noise modelling in microdisk lasers with InGaAs quantum well-dots

Optical loss of different origin was quantitatively evaluated in micrlaser disk resonators. Active region represents InGaAs quantum dots of very high surface density. We found that surface absorption predominantly determines the optical loss in these microresonators, and the scattering loss is responsible for the slope efficiency. The small-signal modulation characteristics of microdisk lasers bonded onto a silicon substrate by thermocompression method were studied. The suppression of the side modes reaches 27 dB already at 1.7xthreshold. The relative optical intensity noise was simulated as a function of the bias current. It is shown that the integral noise is low enough for error-free optical data transmission with the maximum possible bitrate limited by the modulation bandwidth.