Dynamics of a Monolithically Integrated Semiconductor Laser Under Optical Injection

Influences of external optical injection on the nonlinear dynamics of a three-section monolithically integrated semiconductor laser (MISL) are investigated experimentally. The results show that, for the solitary three-section MISL, diversely dynamical states including the stable state as well as the so-called period-one, period-two, multi-period, and chaotic states can be observed through adjusting the currents of the gain section ( ) and the phase section ( ). However, the chaotic operation region of the solitary MISL in the parameter space of and is very small and found to exist when mA and mA. After introducing an external optical injection, the MISL originally operating at other dynamical states can always be driven into chaotic state under suitable injection strength and frequency detuning, and a relatively large will be helpful for obtaining broad and continuous chaotic regions in the parameter space of injection strength and frequency detuning.