29-GHz small-signal modulation bandwidth for directly current-modulated 980-nm oxide-aperture VCSELs

An epitaxial design with a half-lambda optical cavity surrounded by only two oxide-current apertures as small as 2-micrometer in diameter leads to highly confined optical fields and carriers and to a record 29.3-GHz small-signal modulation bandwidth at room temperature for 980-nm vertical-cavity surface-emitting lasers.