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VIS & Illinois Uni`s 850nm GaAs based VCSEL travels 25 Gbit/s over 1km

VI Systems has worked with the American university to develop a VCSEL which is suited for use in the next generation of datacom and computercom standards
Researchers have demonstrated a novel Single Mode Photonic Crystal VCSEL, suitable for error-free 25 Gbit/s data transmission over 1km of multi mode fibre at very low received optical power. .

VI Systems GmbH and the Department of Electrical and Computer Engineering at the University of Illinois, USA demonstrated, jointly, at the Photonics West Conference, a novel Single Mode Photonic Crystal VCSEL (vertical cavity surface emitting laser).

The photonic crystal (PC) VCSEL is manufactured from a proprietary VI System’s wafer which was processed at the University of Illinois at Urbana-Champaign with a defined photolithographic pattern of holes in the top mirror. This process results in a single mode emission of the VCSEL at 850nm wavelength.

The PC VCSEL operating at low current density of 5.4kA / cm2 enables -3dB bandwidth of 18GHz. Error free optical data transmission at 25 Gbit/s over 1-km OM4 multimode fibre has been realised at 1km distances at very low received power of only 70µW at the Department of Solid State Physics at the Technical University of Berlin, Germany, with a high speed photoreceiver module from VI Systems.

Single-mode VCSELs extend the reach over multimode fibre by eliminating the impact of chromatic dispersion of glass at 850nm wavelength, which is particularly important for ultrahigh transmission bit rates within the next generation of datacom and computercom standards.

Target applications are data transmission inside of large data centres, supercomputer clusters and racks of telecom equipment at ultrahigh bit data rates.

1km transmission at very low received power allows cost and energy-efficient 850nm VCSEL-based links to extend to longer distances thus saving space, cost and energy consumption in all major applications.

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