Modeling light vs. current characteristics of long-wavelength VCSELs with various DBR materials
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چکیده
Long-wavelength vertical-cavity surface-emitting lasers (LW-VCSELs) are investigated using electro-thermal, optical, and electronic modeling. The strain-compensated InGaAsP multi-quantum-well active region of the device example is vertically sandwiched between various distributed Bragg reflectors (DBRs). InP/InGaAsP, Si/Si02, and GaAs/AlAs mirrors are considered as well as novel combinations like SiC/MgO. The model includes nonuniform current injection, distributed heat sources, temperature dependent material properties, and k•p band structure calculations. Device parameters such as thermal resistance, threshold current, and external quantum efficiency are compaied and heating effects are evaluated. Simulated light power vs. current characteristics exhibit the typical thermal roll-over in continuous wave operation. The complex influence of the DBB materials is analyzed in detail.
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تاریخ انتشار 2004