Abstract
The longitudinal mode hopping and the related terminal electrical noise in InGaAs/GaAs ridge single quantum well (SQW) lasers are investigated. It is found that electrical mode hopping has a Lorentzian dependence. The correlation with the optical noise is experimentally shown in the low-medium frequency range. Measurements of this electrical-optical correlation give a high value of this parameter (0.8 2 ≤γ2 ≤0.9) when the longitudinal mode hopping is present.