This document discusses LiFi technology, which transmits data through illumination by varying the intensity of LED light bulbs faster than the human eye can detect. Professor Harald Haas is recognized as inventing LiFi in 2010 at the University of Edinburgh. Since then, data rates over 1.6 Gbit/s have been achieved using a single color LED. LiFi uses the unutilized visible light spectrum and has components like a light source (bulb and circuit board) and photodiode receiver. It provides high-speed connectivity without health effects and can enable applications in places that restrict WiFi, like hospitals, airlines, and street lamps.

1. 1
LIFI TECHNOLOGY
 presented By
 SHIVU MANJESH.P
 II MCA IV SEM,
 SJCE.

2. • LI-FI is transmission of data through illumination ,ie
sending data through a LED light bulb that varies in
intensity faster than human eye can follow.
DEFINITION

3. HISTORY
 Professor harald haas, from the university of edinburgh in the UK, is widely recognised as the original
founder of li-fi.
 The general term visible light communication (vlc), includes any use of the visible light portion of the
electromagnetic spectrum to transmit information.
 The d-light project at edinburgh's institute for digital communications was funded from january 2010 to
january 2012.
 Haas promoted this technology in his 2011 ted global talk and helped start a company to market it.
 Pure lifi, formerly pure vlc, is an original equipment manufacturer (oem) firm set up to commercialize li-
fi products for integration with existing led-lighting systems.
 By august 2013, data rates of over 1.6 gbit/s were demonstrated over a single colour LED.

4. DEVELOPMENT TEAM
Dr. Gordon Povey Prof. Harald Haas
Dr. Mostafa Afgani

5. Need OF LIFI
Issues regarding radio spectrum
Capacity
Efficiency Security
Availability

6. Different Electromagnetic Spectrums and their
potentiality
Radio Waves Infrared Visible Ultraviolet X Rays Gamma Rays
In sufficient
spectrum for
increasing data
Low power
application
Which is not used
so far.
Used for hospitals
and security
checking
It is not used
generally
Dangerous for
human body

7. Properties Of LIFI
 LIGHT-BASED WI-FI
 UNUTILIZED ELECTROMAGNETIC SPECTRUM IS USED
 NO MAJOR ILL EFFECT

8. Major Components Of LIFI System
I. Source
II. Receiver

9. Source
1. Bulb: RF power amplifier circuit (PA)
2. Printed circuit board (PCB)
3. Enclosure

10. Receiver
1. A silicon photodiode, which shows good response to
visible wavelength region serving as the receiving element.

11. Working Of LIFI System

12. LIFI Architecture
 The novel architecture of Li-Fi technology is based on the MLU, AL and Li-Fi cloud.
 The MLU is extended to the ALs where every AL has their own Li-Fi cloud to provide
internet and other services connectivity through light.
 The main line is connected to the MLU and further it is extended to small nodes which are
LED bulbs or lamps e.g. AL1, AL2, AL3 and AL4

13. LIFI Architecture cont..
Dimension of LED Lamp or Bulb
Placement and positioning
(PP) dimension
Internal structure design (ISD)
dimension
Fixed Position Movable Position

14. Fixed Position Movable Position
Internal Structure Design

15. APPLICATIONS OF LIFI

16. • Places where Wi-Fi isn’t allowed due to radiation
concerns
• In invasive bio medical instruments
HOSPITALS

17. AIRLINES
• Web access
• Communication purpose

18. • News Updates
• Updates about Natural Calamity
• Emergency Communication in Subway
stations and tunnels, and other
common dead zones
• Cheap high-speed Web access to every
street corner
Street Lamp Post

19. • Li-Fi may not be able to replace conventional radios altogether, but it could turbo charge the
development of wireless television and make it easier to throw a wireless signal across an entire
house.
• Large scale areas that are saturated with radio signals or that doesn’t permit them for security
reasons could use Li-Fi as an alternate high-speed wireless network solution.
• 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.

20. ANY QUERIES……..