Compared with EEL (edge emitter) and LED light source, VCSEL has a different structure and has unique characteristics
and advantages, as shown in the figure below. The vertical structure of VCSEL is more suitable for wafer-level manufacturing,
packaging and testing. Compared with side-emitting LEDs, the cost after mass production has advantages and high reliability. Compared with LED,
VSCEL has some significant advantages, such as high spectral quality and fast response speed.