Optics and Photonics Society of Iran

In this paper, modeling and analysis of a quantum cascade laser (QCL) in the case of dual-wavelength radiation is discussed. Based on the numerical solution of four-level carrier scattering rate equations, the dynamics of carriers and photons in a dual-wavelength QC structure are analyzed and output characteristics are calculated. The results of the simulation includes laser dynamic’s behavior in the transient regime and its modulation response. The results of simulation show that the turn-on time delay and modulation response of the dual wavelength laser is affected by lifetime of the photons in the cavity. In addition it can be seen that due to the dominance of the electron-phonon intersubband scattering in QCLs, the modulation response of this device is faster than modulation response of conventional diode lasers.