Theory for n-type doped, tensile-strained Ge-Si(x)Ge(y)Sn1-x-y quantum-well lasers at telecom wavelength.
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The theoretical model for the bandgap structure, the polarization-dependent optical gain spectrum, and the free-carrier absorption of the n-type doped, tensile-strained Ge quantum-well laser shows a significant net gain can be obtained from the direct transition.Abstract:
We propose and develop a theoretical gain model for an n-doped, tensile-strained Ge-Si(x)Ge(y)Sn(1-x-y) quantum-well laser. Tensile strain and n doping in Ge active layers can help achieve population inversion in the direct conduction band and provide optical gain. We show our theoretical model for the bandgap structure, the polarization-dependent optical gain spectrum, and the free-carrier absorption of the n-type doped, tensile-strained Ge quantum-well laser. Despite the free-carrier absorption due to the n-type doping, a significant net gain can be obtained from the direct transition. We also present our waveguide design and calculate the optical confinement factors to estimate the modal gain and predict the threshold carrier density.read more
Citations
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Tensile-strained, n-type Ge as a gain medium for monolithic laser integration on Si
Jifeng Liu,Xiaochen Sun,Dong Pan,Xiaoxin Wang,Lionel C. Kimerling,Thomas L. Koch,Jurgen Michel +6 more
TL;DR: Results indicate that tensile strained n-type Ge is a good candidate for Si integrated lasers, despite of the free carrier absorption loss.