“This is a milestone. It's the first processor that can use light to communicate with the external world,” said Vladimir Stojanovic, associate professor of electrical engineering and computer sciences at University of California-Berkeley.
No other processor has the photonic I/O in the chip.
Stojanovic and fellow UC Berkeley professor Krste Asanovic teamed up with Rajeev Ram at the Massachusetts Institute of Technology and Milos Popovi? at the University of Colorado, Boulder, to develop the new microprocessor.
“This is the first time we've put a system together at such scale, and have it actually do something useful, like run a programme," added Asanovic. The team found the chip had a bandwidth density of 300 gigabits per second per square millimeter, about 10 to 50 times greater than packaged electrical-only microprocessors currently on the market.
The photonic I/O on the chip is also energy-efficient. The achievement opens the door to a new era of bandwidth-hungry applications. One near-term application for this technology is to make data centres more green.
According to the US Natural Resources Defense Council, data centres consumed about 91 billion kilowatt-hours of electricity in 2013 - about two percent of the total electricity consumed in the US. The paper was published in the journal Nature.