This document provides an overview of LiFi technology. It discusses the history of wireless networks and how they currently rely on radio waves. It then introduces LiFi as a new technology that transmits data through light instead of radio waves. It describes the components and working of LiFi, including how LED lights can be flickered at high speeds to transmit digital data. It compares LiFi to WiFi, discussing LiFi's advantages like higher speeds, more security, and greater available bandwidth. Potential applications and conclusions about LiFi solving bandwidth issues are also presented.

1. Contents
 History of networks
 Present scenario
 Invention of Li Fi
 Introduction
 Components of Li Fi
 Working of Li Fi
 Architecture of Li Fi
 Properties
 Issues with radio waves
 Li Fi Vs Wi Fi
 Advantages
 Disadvantages
 Application
 Conclusion
 Reference

2. History of Networks
 In the olden days, people formed a network in order to
transmit a piece of data from one place to another.
 With the advances in technology a new mode of networking
was developed by using the wires as a medium (wired
networking).
 As time passed the technology increased and we launched
satellites into space and thus were in a position to transmit
enormous amounts of data across various geographical
locations.
 Wireless networking gained a wide recognition and became
the most popular type of all networks .

3. Present scenario
 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 lead to a wide recognition of
WIFI technology.

4. Continued..
 At present the data transmission across the
globe is being done using radio wave range
of the electromagnetic spectrum.
 Whether we are using a wireless internet in
a coffee shop or mall, competing for
bandwidth at a conference or probably
stealing it from the guy next door.
 We often get frustrated because of the low
speeds.

5. Continued..
Also as more and more devices get connected
to the network, clogged airwaves are going to
make it.

6. Invention of lifi
 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.

7. Introduction to LI FI
 Li-Fi (light fidelity) is a wireless technology
that uses light emitting diodes for
transmission of data.
 It sends data through a LED light bulb that
varies in intensity faster than the human eye
can notice.
 It is the optical version of Wi-Fi.
 It uses light instead of radio waves to
transmit information.

8. Continued..
 Light has been around for millions of
years now and is a very cheap resource
unlike radio waves.

9. Components of LiFi
 A high bright white LED, which acts as
communication source.
 A silicon photodiode, which shows good
response to visible wavelength region
serving as receiving element.

11. Working of LiFi
 Li-Fi is implemented using white LED bulbs
at the transmitter.
 The operational is: if the LED is on a digital
1 is transmitted, if the LED is off then a
digital 0 is transmitted.
 They can be switched on and off in order to
transmit data continuously.

12. Architecture of LI FI

13. Continued..
 On one end all the data on the internet will
be streamed to a lamp driver.
 When the LED is turned on the microchip
converts this digital data in the form of light.
 On the other end this light is detected by
photo sensitive devices.
 Next this light is amplified and processed
and then fed to the device.

14. Properties
 Fast and subtle variation of light can also
transmit data with high speed.
 Any LED light set if used along with a
microchip inside it can used to detect the
variation in the light.
 Thus it helps in converting light into data in
its digital form.
 This is like sending a Morse code signal
using a torch but at a very fast speed.

15. Continued..
 The very high speed blinking of the light
enables the source to transmit data in a rapid
stream of binary code that, although
invisible to the naked eye, can be detected
by a light sensitive device.
 Thus every light emitting source can be
used as a hub for data transmission.

16. Issues with radio waves
 CAPACITY:
 The current system makes use of radio
waves.
 With the increasing number of mobile
connections the availability of the spectrum
is getting congested.
 Radio waves forms only a small fraction of
the entire EM spectrum thus making the
problem even worse.

17. Continued..
 EFFICIENCY:
 The current system is high on energy
consumption.
 For every unit of energy consumed the data
transmitted is relatively less.
 The data speeds in the current system can
only reach up to a few hundreds of megabits
per second.

18. Continued..
 AVAILABILITY:
 The availability of the radio waves is yet
another major issue now a days.
 These waves are not much available during
the flight travel.
 It is not advisable to use these devices to
places like petrol bunks.

19. Continued..
 SECURITY:
 These radio waves can easily penetrate
through the walls, thus letting anonymous
users to use the network.
 This can pose threat if the people with bad
intentions start using it.

20. Li-Fi Vs Wi-Fi
 Li-Fi
 Data density is high
 Uses visible light
wave portion of EM
spectrum.
 Cheap
 High data transfer rate
over 1GB
 Wi-Fi
 Data density is low
 Uses radio wave
portion of EM
spectrum.
 Expensive
 It has a data transfer
rate of maximum
54Mbps

21. Advantages of LiFi
 Higher speed than WiFi.
 More secure as data cannot be intercepted
without a clear line of sight.
 It has10,000 times wider bandwidth.
 Availability is not an issue as light is present
everywhere.
 It consumes less energy and highly efficient.
 It can be used in the environments like
hospital, aircrafts.

22. Disadvantages
 Presence of light is essential.
 Works better with fluorescent light and
LEDs but very low efficiency with bulbs.

23. Applications
Some of the applications of Li-Fi are given
below:
 Airways
 Green information technology
 Free from frequency bandwidth problem
 Increase communication safety
 Multi user communication
 Lightings points used as hotspot
 Smarter power plants
 Under sea Awesomeness

24. Conclusion
 This may solve issues like shortage of radio
frequency bandwidth.
 It will allows internet where traditional radio
based wireless isn’t allowed.
 LI FI will make are lives more technology
driven in the near future.
 With its magic of light it can make our world a
greener, safer, cleaner and moreover a brighter
place to live.

25. References
 http://www.technewspaper.net/best-five-
benefits-of-li-fi-technology/
 http://www.youtube.com/watch?v=gjqSgsKbag
Qs
 http://en.wikipedia.org/wiki/Li-Fi
 http://www.ripublication.com/irph/ijict_spl/ijict
v4n16spl_11.pdf
 http://journal.rtmonline.in/vol21iss1/05297.pdf