Techrex2012

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.

About 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 will be on display at the China International Industry Fair that will kick off on 5 November 2013 in Shanghai.