Dynamic model of tapered semiconductor lasers and amplifiers based on transmission-line laser modeling

We have proposed a new dynamic model for both tapered laser oscillator and laser amplifier structures based on transmission-line laser modeling. The internal laser processes are represented in terms of microwave circuit theory, giving additional insight to the operation of the laser. The model is semianalytical to improve computational efficiency and is in time domain to allow inclusion of nonlinear effects. Simulation results agree with published results, proving the validity of the model. The dynamics of picosecond pulse amplification in tapered amplifier structures have been studied using the model, taking into account the effects of pulse energy and residual reflectivity. It has been found that residual reflectivity can give an almost undistorted amplified pulse, at the expense of pulse energy gain.