Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 64: Focus Session: Optical interconnects - Materials, devices, and integration

HL 64.1: Invited Talk

Thursday, March 19, 2015, 09:30–10:00, EW 202

Energy efficient optical interconnects for datacom and HPCs — •Dieter Bimberg — Center of NanoPhotonics, TU Berlin

Vertical-cavity surface-emitting lasers (VCSELs) are emerging to be the decisive cost-effective, energy-efficient, and reliable light sources for short-reach (up to ~1000 m) optical interconnects in data centers and supercomputers. To viably replace copper interconnects and to advance to on-chip integrated photonics, VCSELs ideally should be able to operate at high energy efficiency, at large bit rates, and without cooling at up to 85 °C with immunity to temperature variations, which seem to be contradictions. We demonstrate that VCSELs with narrow 3-5 *m oxide apertures and ~ 15 nm shift between gain peak and maximum mirror transmission can achieve temperature-stable, energy-efficient and high-speed operation coincidently. Detailed theoretical and systematic experimental temperature- and oxide aperture-diameter-dependent characterization including static characteristics, small-signal analysis, and data transmission experiments are presented, for a variety of wavelengths. With contributions by: Connie Boldt, Günther Larisch, Hui Li, James Lott, Philip Moser, Philip Wolf, Maya Volwasen