Newest Technology

1. Presenter: Ibrahim Quddusi
Topic: Li- Fi

3.  LI-FI is transmission of data through illumination, sending
data through a LED light bulb that varies intensity faster
than human eye can follow

4.  A German physicist, Harald Haas, has started working on
transmission of data using visible light back in 2004.
 In the year 2011 he first introduced to the world this new
technology, LI FI in the TED talk show.
 He envisions a future where data for laptops and other
mobile devices is transmitted through a light in a room.

5.  Operational procedure is very simple,
 if the LED is on, you transmit a digit ‘1’,
 if it is off you transmit a ‘0’.
 The LEDs can be switched on and off very quickly,
 which gives nice opportunities for transmitting data.
 Hence all that required is some LEDS and a
 controller that code data into those LEDs.

6. HOW LI-FI WORKS ?

7.  At present we have as many as 1.5 million radio wave base
stations across the globe.
 We also have close to 5 billion mobile connections which
transmit a data over 600TB.
 This penetration of mobile devices into our lives has led to
a wide recognition of WIFI technology.

8.  At present the data transmission across the globe is being
done using radio wave range of the electromagnetic
spectrum.
 This results in some drawbacks in the current system.

9.  CAPACITY:
 The current system makes use of radio waves.
 With the increasing number of mobile connections the
availability of the spectrum is getting congested.
 EFFICIENCY:
 The data speeds in the current system can only reach up to
a few hundreds of megabits per second.

10.  AVAILABILITY:
 These waves are not much available during the flight
travel.
 SECURITY:
 These radio waves can easily penetrate through the walls,
thus letting anonymous users to use the network.
 ECONOMIC:
 Due the limited availability of the radio waves the tariff
rates are relatively costlier.

11.  CAPACITY:
 Visible light spectrum is 10000 times more compared to
radio wave spectrum.
 EFFICIENCY:
 The data transmission can reach up to thousands of
gigabits per second thus providing very rich data
streaming.

12.  AVALIABILITY:
 There are an estimated 14 billion light sources on earth
and each can be easily converted into a LI FI hotspot.
 SECURITY:
 Unlike radio waves light waves cannot penetrate through
opaque objects thus providing plenty of network privacy.
 ECONOMIC:
 The tariff rates can be very cheap as light waves are a
cheap resource.

13.  Gamma rays cant be used as they could be dangerous.
 X-rays have similar health issues.
 Ultraviolet light is good for place without people, but
otherwise dangerous for the human body.
 Infrared, due to eye safety regulation can only be used with
low power.
HENCE WE LEFT WITH THE ONLY VISIBLE –
LIGHT SPECTRUM.
Radio
Waves
Infrared
Rays
Visible
Rays
Ultraviolet
Rays
X- Rays
Gamma
Rays

14.  Li Fi technology is still in its infancy .However some areas
where it seems perfectly applicable are:-
 TRAFFIC LIGHTS
 Traffic lights can communicate to the car and with each
other.
 AIR WAYS:
 Whenever we travel through airways we face the problem
in communication media ,because the whole airways
communication are performed on the basis of radio
waves.
To overcomes this drawback on radio waves ,li-fi is
introduce.

15. The possibilities are numerous and can be explored
further. If this technology can be put into practical use,
every bulb can be used something like a Wi-Fi hotspots to
transmit wireless data.