Fibre-optic connections created using surface-emitting lasers

The technology could have direct and immediate applications for industries that have already started using this type of laser, such as large data centres run by Google, eBay and Amazon and some supercomputer manufacturers.

‘The market for this technology is gigantic,’ said project lead Prof Anders Larsson of Chalmers University of Technology in Sweden. ’In the huge data centres that handle the internet there are today more than 100 million surface-emitting lasers. That figure is expected to increase 100-fold.’

The team was able to increase the speed of a surface-emitting laser around four-fold using a strained multi-quantum active region and multiple oxide layers.

Unlike a conventional laser, the light from a surface laser is emitted from the surface of the laser chip like in a light-emitting diode (LED).

The lasers can be fabricated and tested on the wafer before it is cut into individual chips for assembly — in contrast with conventional lasers that work only after partition. The ability to test up to 100,000 lasers on a wafer reduces the cost of production to one-tenth compared with conventional lasers.