Multimode Analysis of High-Speed Multiple-Quantum Well Semiconductor Laser

This paper introduces analysis of mode dynamics in multiple-quantum well (MQW) laser as a promising device for high-speed photonics. The study is based on a multimode model of semiconductor laser under direct intensity modulation. The simulation results are used to investigate the influence of the injection current on the dynamics of the non-modulated multimode laser, as well as influence of the modulation parameters (modulation index and modulation frequency) on the dynamics of the laser. The modal oscillations and the associated multimode hopping that characterizes the long-wavelength laser are investigated in both the non-modulated and modulated laser. The coupling among the oscillating modes under both cases is evaluated in terms of their correlation coefficients. Dependence of the small-signal modulation response and bandwidth on the bias current is introduced. In addition, we present comparison of the modulation response of the total output with those of the strongest oscillating modes.