OPTIMUM COUPLING JUNCTION AND CAVITY LENGTHS FOR COUPLED-CAVITY SEMICONDUCTOR-LASERS

The authors investigate the dependence of the mode suppression in coupled-cavity semiconductor lasers on coupling junction parameters and cavity lengths. An effective mirror formalism is developed and combined with exact numerical analysis to explore the mode behavior across the entire relative cavity gain operating range of coupled-cavity resonators. A gap coupling model is also presented which permits one to deduce the optimum gap spacing for best mode suppression, as well as the dependence of this optimum gap spacing on relative cavity lengths. Finally, the exact numerical analysis is combined with spectral gain roll-off to explore the mode suppression of all modes of the system versus cavity lengths.