We report the improvement, from , in the optical modulation bandwidth of a quantum-well (QW) heterojunction bipolar transistor laser (TL) by the use of an ac auxiliary base signal. Because of the three-terminal form of the TL, an auxiliary signal can be used to peak the photon output, e.g., stimulated recombination which simultaneously reduces the operating current gain, , and increases the laser differential gain. A shorter effective base carrier lifetime, , owing to the increased QW recombination rate (stimulated recombination), enhanced carrier transport to the “faster” QW collector (reduced ) and differential gain, result in a higher bandwidth .
Optical bandwidth enhancement of heterojunction bipolar transistor laser operation with an auxiliary base signal
H. W. Then, G. Walter, M. Feng, N. Holonyak; Optical bandwidth enhancement of heterojunction bipolar transistor laser operation with an auxiliary base signal. Appl. Phys. Lett. 20 October 2008; 93 (16): 163504. https://doi.org/10.1063/1.3000635
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