"Физика и техника полупроводников"
Вышедшие номера
Numerical simulation of optical feedback on a quantum dot lasers
Al-Khursan Amin H.1, Ghalib Basim Abdullattif2, Al-Obaidi Sabri J.3
1Nassiriya Nanotechnology Research Laboratory (NNRL), Science College, Thi-Qar University, Nassiriya, Iraq
2Laser Physics Department, Science College for Women, Babylon University, Hilla, Iraq
3Physics Department, Science College, Al-Mustansiriyah University, Baghdad, Iraq
Поступила в редакцию: 5 июля 2011 г.
Выставление онлайн: 20 января 2012 г.

We use multi-population rate equations model to study feedback oscillations in the quantum dot laser. This model takes into account all peculiar characteristics in the quantum dots such as inhomogeneous broadening of the gain spectrum, the presence of the excited states on the quantum dot and the non-confined states due to the presence of wetting layer and the barrier. The contribution of quantum dot groups, which cannot follow by other models, is simulated. The results obtained from this model show the feedback oscillations, the periodic oscillations which evolves to chaos at higher injection current of higher feedback levels. The frequency fluctuation is attributed mainly to wetting layer with a considerable contribution from excited states. The simulation shows that is must be not using simple rate equation models to express quantum dots working at excited state transition.
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