Influence of Nonlinear Gain on Direct Modulation Characteristics of 2s-DBR Lasers: Numerical Study

A theoretical study of effect of nonlinear gain on the direct modulation characteristics of two section DBR (2s-DBR) lasers is presented. Based on multimode rate equations with nonlinear gain terms, simulations are performed. The nonlinear gain is found to have influences on the direct modulation characteristics of the 2s-DBR lasers, including the carrier photon resonance (CPR) and the photon photon resonance (PPR).