A Simple Model for Cavity Enhanced Slow Lights in Vertical Cavity Surface Emission Lasers

摘要

We develop a simple model for the slow lights in Vertical Cavity SurfaceEmission Lasers (VCSELs), with the combination of cavity and populationpulsation effects. The dependences of probe signal power, injection biascurrent and wavelength detuning for the group delays are demonstratednumerically and experimentally. Up to 65 ps group delays and up to 10 GHzmodulation frequency can be achieved in the room temperature at the wavelengthof 1.3 $\mu$m. The most significant feature of our VCSEL device is that thelength of active region is only several $\mu$m long. Based on the experimentalparameters of quantum dot VCSEL structures, we show that the resonance effectof laser cavity plays a significant role to enhance the group delays.