CdSe/ZnSe quantum dot semiconductor optical amplifier is studied theoretically where the core/shell structure is discussed. Absorption and emission coefficients and noise figure are studied. The emission coefficient obtained is higher than the similar structure of InGaAs/InP. A 25dB gain is obtained. A low noise figure (5.5dB) is obtained. A high output power can be obtained. The simulated structure can be used to develop photonic integrated circuits.
This work studies the total gain of the InTlAsSb quantum dot structure, which is not studied earlier. Adding thallium to structures makes it emit at larger wavelengths. The nonlinear effect of the injected signal power is examined for three quaternary thallium structures: In0.85Tl0.15AsSb, In0.93Tl0.07AsSb and In0.97Tl0.03AsSb. The gain peak was increased by four times and the wavelength was shifted to longer one for the In0.97Tl0.03AsSb quantum dot (QD) structure. This quaternary QD structure extends the emission wavelength to more than 12 μm which is important in long-wavelength infrared applications. The nonlinear behavior of these QD structures is also addressed. It is shown that the structure In0.97Tl0.03AsSb has a deeper spectral hole burning which is adequate for nonlinear signal processing applications.
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