Original research articleAn equivalent circuit-level model for dual-wavelength quantum cascade lasers

We introduce an equivalent circuit model for dual-wavelength quantum cascade lasers (QCLs) using the four-level rate-equations. We examine the validity of the proposed circuit model by comparing the simulated results with the theoretical results available in the literatures. By using the proposed equivalent circuit-level model, the effects of injection current on dual-wavelength QCL static and dynamic behaviors are investigated. We show that the proposed circuit-level model can accurately predict the operating characteristics of the dual-wavelength QCLs.