Regensburg 2010 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 2: Nanophotonics - Devices II (Focused Session together with HL)

DS 2.6: Topical Talk

Montag, 22. März 2010, 16:45–17:15, H2

High speed VCSELs for short reach DATACOM applications — •Alex Mutig¹, James Lott², Sergey Blokhin¹, Gerrit Fiol¹, Alexey Nadtochiy¹, Vitaly Shchukin³, Nikolai Ledentsov², and Dieter Bimberg¹ — ¹Institut für Festkörperphysik und Zentrum für Nanophotonik, Technische Universität Berlin, Hardenbergstrasse 36, 10623 Berlin, Federal Republic of Germany — ²VI Systems GmbH, Hardenbergstrasse 7, 10623 Berlin, Federal Republic of Germany — ³PBC Laser GmbH, Hardenbergstrasse 36, 10623 Berlin, Federal Republic of Germany

Around the year 2001 VCSELs emerged as the key component for up to 10 Gbit/s, aggregated high speed local-area and storage-area network data communication systems and soon thereafter for optical cable links for computer and consumer applications as well. The rapid increase in serial transmission speed and the limitations of copper wire-based links at bit rates >10 Gbit/s and distances >1 m greatly expanded the possible application areas of fiber-optic interconnects. Here we present our work on oxide-confined VCSELs operating at bit rates up to 40 Gbit/s and at low current densities of ∼10 kA/cm², sufficient for reliable operation. The small signal modulation bandwidths and resonant frequencies up to ∼22 GHz are measured, and the relaxation resonance frequency, damping factor, and electrical parasitic cut-off frequency are evaluated. According to our results with further improvement in the device design to reduce parasitics optical modulation bandwidths exceeding 30 GHz can be realized, leading toward reliable VCSEL serial operation at rates up to 50 Gbit/s.