ULTRAHIGH-FREQUENCY SELF-PULSATIONS UNDER GAIN-SWITCHING MODULATION IN 1.5-MU-M DYNAMICAL SINGLE-MODE MONOLITHIC COMPOUND-CAVITY SEMICONDUCTOR-LASERS - EXPERIMENT AND THEORY

The generation of 50-130-GHz high-frequency self-pulsations in ultrafa st gain-switched InGaAs-InGaAsP dynamical single-mode monolithic compo und-cavity lasers is studied in this paper. With various cavity length s, the dependence of the pulsation frequency on the length of the resp ective cavity is shown and analyzed in detail. To explain the observed phenomena, a dynamic theory of the semiconductor laser amplifier is d escribed which takes into account the coherent time-dependent amplific ation, shortening, and reflection of an incident picosecond optical pu lse in the gain-switched amplifier. With the presented model, the theo retical simulation results agree well with the experimental observatio ns.