Abstract
The coupling effects between quantum wells (QWs) on the small-signal response of unstrained multiple QWs (MQWs) are studied theoretically in a two-band-model approximation. A finite- well model and flat-band conditions were assumed. For any barrier thickness between QWs the gain spectrum showed many peaks located at heavy-hole and light-hole transitions. Therefore, the lasers under investigation are being treated as multiple-level systems. It has been shown that the dependence of this peak is a function of the barrier thickness. The traditional rate equations were reformulated and solved for the intensity modulation response. Results and discussion for the characteristics referred above of a GaInAsP-InP double quantum well laser are presented as a specific example. We conclude that, in contrast to the common belief, the coupling effects can enhance the modulation characteristics under certain conditions.© (1996) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
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