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Ultrashort-pulse generation and subharmonic bifurcation in directly modulated MQW lasers

This paper investigates the generation of ultra-short pulses form directly modulated multiple-quantum-well (MQW) laser diodes. The ultra-short pulse generation is stimulated using the rate equations' model. The effects of the input signal parameters on the duration and magnitude of the pulses are examined from simulations. Particular interest is paid to the influence of spontaneous emission factor on the chaotic laser behavior. The study is focused on improving the understanding of how the phenomenological laser parameters influence the nonlinear dynamics and on establishing the connections between the modulation signal parameters and the nonlinear dynamic behavior. The numerical simulations carried out for different laser structures show good agreement with previously reported results and demonstrate period bifurcation and chaos for some ranges of the bias current and modulation index.