Method for measuring VCSEL reverse bias leakage in an optical module

Reverse bias leakage testing may be used to determine the health of a vertical cavity surface emitting laser (VCSEL). When VCSELs are integrated on a die with other electronic devices such testing may damage the other electronic devices or be prohibited by circuits on the die designed to protect the electronics from being reverse biased. Accordingly, reverse bias testing may be facilitated by providing a second ground pad, separate from the die ground pad, specific to the VCSEL.