Corkscrew Lasers Are About to Speed Up the Internet
We transmit almost a thousand petabytes of
The findings of their DARPA-funded study, which were published in Science today, describe a novel new way to send data down an optical fiber by using donut-shaped laser beams called optical vortices. To understand what's really remarkable about this, it helps to know how bandwidth works right now. Currently, the 0s and 1s that make up your emails, photos, and YouTube vidoes travel down the optical fiber as specific colors, which are unpacked at the other end according to hue. Traditionally, bandwidth is increased by adding more colors to the process-but that's a limited approach.
The scientists at BU, though, have harnessed the power of a laser that travel along
modes within the fibre, each "mode" carrying several different colors. The system is capable of transmitting 1.6 terabits per second, which as lead author Siddharth Ramachandran
, is exponentially faster than our current
A typical cable Internet connection to a home delivers 1-10 megabits per second of data, which means that the transmission capacity we demonstrated with OAM modes in our fiber represents a capacity equivalent to one million simultaneous cable-internet connections today.
According BU, physicists and biologists have know about optical vortices for decades-in fact, they're a central tenet of quantum computing, which imagines the application of ideas about quantum mechanics to technology. But up until now, the phenomenon was thought to be too hard to control.
So just how fast is 1.6 terabytes a second? It's the rough equivalent of the data of 100,000 phonebooks hurtling towards your house, through tornado-shaped laser beams, every second. [ Science via Futurity ]