Generation of internally circulating mode in high-power superluminescent diodes with grazing-stripe waveguide

The features of the occurrence of internally circulating modes in superluminescent diodes with a grazing-stripe waveguide with an active region based on 5 layers of InGaAs/GaAs quantum well-dots emitting in the range $\sim$1 $\mu$m are studied. A simple qualitative model is proposed that explains the decrease in the threshold current with an increase in the pump pulse duration. Approaches for suppressing internally circulating mode sare proposed, which can significantly increase the output optical power of superluminescent diodes.