  A detailed rate-equation-based model is developed to study carrier transport
effects on optical and electrical characteristics of the Multiple Quantum Well
Heterojunction Bipolar Transistor Laser in time-domain. Simulation results
extracted using numerical techniques in small-signal regime predict significant
enhancement in device optical bandwidth when multiple quantum wells are used.
Cavity length and base width are also modified to optimize the optoelectronic
performances of the device. An optical bandwidth of \approx 60GHz is achieved
in the case of 5 quantum wells each of 70A widths and a cavity length of 200um.
