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Light Emitting Diodes (LEDs), Laser Diodes, and Vertical Cavity Surface
Emitting Lasers (VCSELs) are finding their way into more and more
applications today. These applications include facial scanners for
security, LIDAR for collision avoidance and self-driving cars, as well
as optical telecommunications. While the VCSEL is a relatively simple
device in terms of its electrical behavior, it also has optical
properties and behaviors that must be tested as well. This requires a
different approach to testing than with a standard discrete diode.
Engineers need to test both the electrical and optical properties of
these devices, sometimes at very high frequencies.