The wireless networks that we use to connect to the internet nowadays
use radio frequencies to communicate. Researchers from the National
Taipei University of Technology have created a network that bypasses
radio frequencies entirely and makes use of lasers to transfer data.
Although its setup and the science behind it are more complicated,
here’s a basic idea of how it works. The model utilizes basic AAA
battery-powered red and green laser pointers and some other components
that are worth a mere US $600. The researchers pointed the laser
pointers at photodiode receptors stationed about 30 feet away and
strobed the lights on-and-off at a rate of 500 million times per second.
With this, they were able to create a 500 Mbps data stream over each
laser, thus adding up to 1Gbps in speed. That’s an incredible rate and
way faster than our Wi-Fi routers can transfer data.
The bit error rate was only about one bad bit per billion, which is
extremely lower than the one bad bit per 100,000 on most Wi-Fi streams.
Also, since the technology makes use of light, it isn’t subject to
over-the-airwaves interference. The downside though, is that it’s
susceptible to interference from actual physical objects blocking the
path, including fog and rain. It can also only travel where it’s
pointed, unlike radio frequencies.
Because of these drawbacks, we doubt that this technology will
replace radio-based data communication. It may become a feasible way to
transfer data indoors, however, in places such as hospitals that can’t
tolerate radio interference.
