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 (
$I_{G}$
) and the phase section (
$I_{P}$
). However, the chaotic operation region of the solitary MISL in the parameter space of
$I_{G}$
and
$I_{P}$
is very small and found to exist when
$21.28~\textrm {mA}< I_{G}< 26.40$
mA and
$31~\textrm {mA}<I_{P}< 37$
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
$I_{G}$
will be helpful for obtaining broad and continuous chaotic regions in the parameter space of injection strength and frequency detuning.