Scientists
from Fudan University, Shanghai successfully developed Li-Fi Technology-a new
cheaper way of getting connected to internet by using signals sent through
light bulbs instead of radio frequencies as in ‘Wi-Fi’.
According
to the School of Information Science and Technology at Fudan University,
researchers modulated Internet signals to a 1watt LED lamp. Under the light,
four computers were able to access the Internet.
Li-Fi
Technology
The
LED-based alternative to Wi-Fi, dubbed Li-Fi, or Light Fidelity, refers to a
type of visible light communication technology that delivers a networked,
mobile, high-speed communication solution in a similar manner to Wi-Fi.
As
with radio waves, light is also a type of electromagnetic wave. The basic rule
for sending and receiving Internet signals via light waves is similar to that
for radio waves. Light-emitting diodes are switched on and off much faster than
the eye can detect, which makes the light source appear to be continuous.
By
adding a microchip to an LED bulb to control on and off switching, the data
will flow as binary code: an on LED is a logical "1" while when off
it is a logical "0".
The
term Li-Fi was coined by Harald Haas from the University of Edinburgh in the UK
and refers to a type of visible light communication technology that delivers a
networked, mobile, high-speed communication solution in a similar manner as
Wi-Fi.
Sample
Li-Fi kits that will be on display at the China International Industry Fair
that will kick off on 5 November 2013 in Shanghai.
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