A small-signal frequency response model with electron and hole transports in multiquantum-well lasers

The authors propose a small-signal frequency response model for high-speed multi-quantum-well (MQW) lasers. Electrons and holes are treated independently to deal with the high-frequency range faster than the carrier thermionic emission from the well, where the ambipolar approximation is unsuitable. The electron current modulates the stimulated emission even in the high-frequency range beyond the hole transport limit. Therefore, the present model predicts a larger response than the conventional ambipolar model in the high-frequency range, and it gives a better explanation of the experimental results for high-speed MQW lasers.<>