In this paper, the band structure of a quantum cascade (QC) laser utilizing techniques with both material-dependent effective mass and band non-parabolicity is calculated by self-consistent solution of Schrodinger-Poisson equations, and based on a two-level rate equations model, the carrier and photon dynamics in the structure are analyzed. The results of simulation show that, because of the characteristics of the intersubband transition and ultra-fast lifetimes,the modulation bandwidth of QC Lasers is more than one order of magnitude greater than that of the conventional diode lasers, and QC Laser has non-oscillating response at above threshold conditions.

Keywords: intersubband transitions, modulation response, rate equations, ultra-fast scattering

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