Ultrahigh-speed VCSEL reaches 40 Gbit/s

Sept. 4, 2014
VI Systems was awarded a US patent for its vertical-cavity surface-emitting laser (VCSEL) technology.

VI Systems (Berlin, Germany) was awarded US patent number 20130092896 for its "Optoelectronic Device with a Wide Bandgap and Method of Making Same." The vertical-cavity surface-emitting laser (VCSEL) technology enables data-transmission speeds of 40 Gbit/s for 850 nm lasers operating at temperatures up to 80ºC and 25 Gbit/s speeds at elevated 100ºC temperatures. The patent is applicable to both visible and infrared VCSEL devices, and can also be applied to light-emitting diodes (LEDs) targeting the bright red, orange, yellow, and even green spectral ranges.

VCSEL technology has previously been transmission-speed-limited because of leakage of the injected nonequilibrium carriers from the gain medium into the passive cladding areas due to the thermal tail of their energy distribution. This leakage degrades device performance at elevated temperatures and at high current densities—particularly important for high-speed operation. Furthermore, the leaked carriers can recombine at point defects near the oxide aperture of the devices and result in fast degradation of the device. By applying a proper barrier structure with a specific composition, VI Systems has succeeded in increasing the barrier heights for nonequilibrium carriers and enabling ultra-high-speed VCSEL operation at high temperatures. Sample bare chips and fiber-coupled modules are available now. Contact George Schaefer at [email protected].

Sponsored Recommendations

Request a quote: Micro 3D Printed Part or microArch micro-precision 3D printers

April 11, 2024
See the results for yourself! We'll print a benchmark part so that you can assess our quality. Just send us your file and we'll get to work.

Request a free Micro 3D Printed sample part

April 11, 2024
The best way to understand the part quality we can achieve is by seeing it first-hand. Request a free 3D printed high-precision sample part.

How to Tune Servo Systems: The Basics

April 10, 2024
Learn how to tune a servo system using frequency-based tools to meet system specifications by watching our webinar!

Precision Motion Control for Sample Manipulation in Ultra-High Resolution Tomography

April 10, 2024
Learn the critical items that designers and engineers must consider when attempting to achieve reliable ultra-high resolution tomography results here!

Voice your opinion!

To join the conversation, and become an exclusive member of Laser Focus World, create an account today!