A numerical study has been preformed for the oxide-confined vertical cavity surface emitting lasers (VCSEL) operating at 850 nm region of the electromagnetic spectum. Relevant VCSEL design with numerous oxide aperture sizes has been designed and characterized by using laser technology-integrated program ISETCAD simulation. In this paper, the effect of oxide aperture size is studied by changing the size of aperture from 1 to 8 gm. The investigations of electrical as well as optical characteristics of the designed VCSEL have been performed, which include the overall device performance as a function of oxide aperture size. It is observed that the increase in the aperture radius of the VCSEL cause increase in both the threshold current to up 4.578 mA and output power up to 37.85 mW. Furthermore, the slope output efficiency of up to 1.003% corresponding to differential quantum efficiency up to 68.65% was obtained.
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