End of Wi-fi Woes- Infrared Light Li-fi to deliver 100 times faster Internet
In a rare feat accomplished by Dutch
researchers at the Eindhoven University of Technology in the Netherlands, a new
wireless internet based on harmless infrared rays, is all set to support
devices without ever getting congested. What’s more- it is 100 times faster
than the existing Wi-fi network and is capable of moving data at speeds of
about 42.8 Gigabits per second (Gbit/s).
The wireless data comes from few
central 'light antennas', which don’t have any moving parts and are able to
very precisely direct the rays of light supplied by an optical fiber. This
translates signals from a fiber-optic cable into infrared light further beaming
them to receivers in the same room. These can then be tracked by their return
signals so that when a user’s device moves out of one beam’s area of function,
another light antenna can take over. The antennas contain a pair of gratings
that radiate light rays of different wavelengths at different angles. Changing
the light wavelengths also changes the direction of the ray of light.
Moreover the technique is virtually harmless with the use of a safe infrared wavelength not reaching the vulnerable retina of eyes. The addition of devices are assigned different wavelengths by the same light antenna and hence do not have to share capacity. An added advantage is that of scrupulous elimination of the phenomenon of interference from a neighboring Wi-fi network.
Moreover the technique is virtually harmless with the use of a safe infrared wavelength not reaching the vulnerable retina of eyes. The addition of devices are assigned different wavelengths by the same light antenna and hence do not have to share capacity. An added advantage is that of scrupulous elimination of the phenomenon of interference from a neighboring Wi-fi network.
The system conceived by the researchers uses infrared light with wavelengths of 1500 nanometers and higher (some 200 terahertz) which makes the data capacity of the light rays much larger. Current wi-fi uses radio signals with a frequency of 2.5 or 5 gigahertz. While being the most advanced and novel aspect of Photonic technology, the system isn’t going to be commercially available until at least next five years.
Source | Eindhoven University
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