We develop a model for the slow light in the Vertical Cavity Surface Emission Lasers (VCSELs), with the combinations of cavity and the population pulsation effects. The dependences of pumping power, injection current and wavelength detuning for the group delays are demonstrated theoretically and experimentally. Up to 65ps group delays and up to 10GHz modulation frequency can be achieved in the room temperature at the wavelength of 1.3μm. Based on the experimental parameters of quantum dot VCSEL structures, we show that the resonance effect of laser cavity plays a significant role to enhance the group delays.
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