Microcavity lasers (μCLs), reduced-size (≤3 μm aperture) vertical cavity surface-emitting lasers (VCSELs) defined by the buried-oxide process for current and field confinement (thus wide mode spacing), are demonstrated with low threshold current, sharp turn-on L-I characteristics, and wide bandwidth operation. Due to the enhanced spontaneous recombination rate at reduced mode and improved photon density, μCLs exhibit lower charge-field resonance peaks at a modulation bandwidth f-3 dB =18.7 GHz, thus permitting open-"eye" operation at 20 and 40 Gb/s data rates (I≤3 mA). The energy efficiency for 20 Gb/s data transmission is measured to be 4.84 Gb/s/mW, which is eight times better than 7 μm aperture VCSELs.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)