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Reliability demo of VCSEL devices at 40Gbit/s

Posted: 16 Nov 2011 ?? ?Print Version ?Bookmark and Share

Keywords:VCSEL? optical transmitter? bit error ratio?

Researchers from the Vertically Integrated Systems for Information Transfer (VISIT) program funded by the European Commission have released the details of a recently developed optical transmitter. The Vertical Cavity Surface Emitting Laser (VCSEL) devices made from a material in IQE plc feature operating data rates of up to 30Gbit/s at 85C and up to 40Gbit/s at 25C with bit error ratios of less than 10E-12.

The VCSEL devices showed high temperature stability in the linear region of the light power versus current characteristic with a less than 25?W/C change in emission power for operation below 6mA from 20-100C. The peak output power exceeded 8mW for multimode operation and up to 4mW for single mode operation, all with differential slope efficiencies exceeding 70 percent at up to 40C.

VCSEL device

The VCSEL device's peak output power exceeded 8mW for multimode operation.

Multi-mode VCSEL device operation was demonstrated at current densities below 10kA/cm2. This is a critical factor in determining device reliability that is expected to greatly improve with the further development of single-mode VCSELs.

The VISIT team has also claimed to have produced the first 40Gbit/s packaged VCSELs, complete with an OM3 fiber pigtail and a high frequency electrical V-connector for ease of system-level optical link testing and development.

The next development stage under the VISIT program will focus on final directly modulated VCSEL benchmarking and design and processing refinement including device designs for reliability and manufacturability. The VISIT team will also work on further improvements in the packaging and testing of optical transmitter subassemblies.

- Nick Flaherty
??EE Times

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