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VCSELs have several advantages over conventional edge-emitting lasers including lower divergence of the circular beam, ability to be tested on the wafer before packaging to reduce costs, and ability to be fabricated using IC manufacturing techniques. VCSELs use distributed Bragg reflector mirrors above and below a central active region to form an optical cavity perpendicular to the wafer surface. Selective oxidation is commonly used to fabricate VCSELs and provides both electrical and optical confinement of

Author

Tenish Mathew

Language

EN