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 i nternal laser processes are represented in terms of microwave circuit theor y, giving additional insight to the operation of the laser. The model is se mianalytical to improve computational efficiency and is in time domain to a llow inclusion of nonlinear effects. Simulation results agree with publishe d results, proving the validity of the model. The dynamics of picosecond pu lse amplification in tapered amplifier structures have been studied using t he model, taking into account the effects of pulse energy and residual refl ectivity. It has been found that residual reflectivity can give an almost u ndistorted amplified pulse, at the expense of pulse energy gain.