27 April 2010 Oxide confined 850-nm VCSELs for high-speed datacom applications
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Abstract
Vertical cavity surface emitting lasers (VCSELs) are low cost and reliable light sources for high-speed local area and storage area network (LAN/SAN) optical fiber data communication systems and all other short-reach high-speed data transfer applications. The intrinsic limitations of copper-based electrical links at data rates exceeding 10 Gbit/s leads to a progressive movement wherein optical communication links replace traditional short-reach (300 m or shorter) copper interconnects. The wavelength of 850 nm is the standard for LAN/SAN applications as well as for several other evolving short-reach application areas including Fibre Channel, InfiniBand, Universal Serial Bus (optical USB), and active optical cables. Here we present our recent results on 850 nm oxide-confined VCSELs operating at data bit rates up to 40 Gbit/s at low current densities of ~10 kA/cm2 ensuring device reliability and long-term stability based on conventional industry certification specifications. The relaxation resonance frequencies, damping factors, and parasitic cut-off frequencies are determined for VCSELs with oxide-confined apertures of various diameters. At the highest optical modulation rates the VCSELs' high speed operation is limited by parasitic cut-off frequencies of 24-28 GHz. We believe that by further reducing device parasitics we will produce current modulated VCSELs with optical modulation bandwidths larger than 30 GHz and data bit rates beyond 40 Gbit/s.
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Philip Moser, Alex Mutig, James A. Lott, Sergey Blokhin, Gerrit Fiol, Alexey M. Nadtochiy, Nikolai N. Ledentsov, Dieter Bimberg, "Oxide confined 850-nm VCSELs for high-speed datacom applications", Proc. SPIE 7720, Semiconductor Lasers and Laser Dynamics IV, 77201W (27 April 2010); doi: 10.1117/12.854276; https://doi.org/10.1117/12.854276
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