Dynamics of optical switching in polarization-bistable laser diode with detuned light injection

摘要

The switching time of an optically switched polarization- bistable laser diode between locked and free oscillating modes is studied by analytical and numerical methods based on rate equations. Dependencies of switching time on the detuning and power of optical input and injection current are analyzed. It is shown that larger detuning and power of optical input are effective in shortening the switching time as well as smaller injection current. By starting with linear stability analysis, analytical expressions are developed to predict the switching time. Our analytical results, in which the switching of optical output from locked to unlocked mode is shown to be composed of two relaxation processes with a short and long time constants, are in agreement with the numerical results showing fast and slow switching behaviors dependent on the locked state, in contrast to the dynamic behavior of carrier density dominated by a single relaxation process.