The science behind “quantum dots”
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VCSEL stands for Vertical Cavity Surface Emitting Laser.
VCSEL emits light in a cylindrical beam vertically from the surface of a fabricated wafer, and offers significant advantages when compared to the conventional edge-emitting lasers currently used in the majority of fiber optic communications devices.
Now let’s take a comparison between conventional edge emitting laser and VCSEL laser.
The left picture shows a conventional edge emitting laser. The right picture shows a VCSEL laser.
Conventional edge emitting laser has some disadvantages. The light beam usually has a high divergence angle and difficult to couple into optical fiber without a corrective lens. Also it requires higher electrical threshold current to operate.
VCSEL lasers have many advantages. It has a circular light beam which is very easy for coupling into optical fibers. It also consumes less power. Since it emits from the surface, this structure can be integrated in two-dimensional array configuration.
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