Dynamics of hybrid III-V silicon semiconductor lasers for integrated photonics

The dynamics of hybrid III-V/Si lasers are studied for the first time under a combination of two optical feedbacks. A cleaved fiber placed about 20 μm away from the laser creates a short feedback cavity. The effect of this short feedback is studied on a Fabry-Perot laser and reveals the sensitivity of the device to such perturbation, as well as the presence of sub-cavities in the Si waveguides. The dynamics of the laser subjected to additional feedback from a 70-m fiber cavity show that the long-feedback dynamics are governed by the sub-cavities. This behavior is confirmed using a complex tunable III-V/Si laser.