Li-Fi, as coined by Prof. Harald Haas during his TED Global talk, is bidirectional, high speed and fully networked wireless communications, like Wi-Fi, using light. Li-Fi is a subset of optical wireless communications (OWC) and can be a complement to RF communication (Wi-Fi or Cellular network), or a replacement in contexts of data broadcasting.

1. The Future
Technology In
Wireless
Communication
Nisha Sharma

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The
Mobile
Revolution

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1.4 Million 5 Billion
This year,for the first
time,there will be
more mobile phones
on the earth than
there are people.
…by 2018,sending the
equivalent of 1.8 million
years of HD video every
month.
By 2020…
1000 wireless devices
per person.
AND
Available spectrum
will run out.

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LI-FI is transmission
of data through
illumination,
sending data
through a LED
light bulb.

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Prof. Harald Hass,Developer of Li-Fi

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Principles
Of
Li - Fi

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1101011110001010101001

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01010001011101010
01010001011101010
11101010100010101
10100001010111010
11101010100010101
01010001011101010

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What
is
LED ?
• Semiconductor Light Source
• p-n junction diode which emits
light
•Includes electroluminescence
•Electron recombines with holes
when voltages are provided ,
releasing energy in the form of
photons

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Mirrored cup
p-type
n-type
p-type
n-type
energy

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Why only
LED ?
NOT
Consistent
Light bulbs ?

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How
Li - Fi
Works ?

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LED on
LED off
1 0 1 1 0 1 0 1

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Li - Fi Environment

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10 0 10 3 10 4 108 109 1011 1012 1014 1015 1016 1017 1019 1020 1024
Long
Radio
Waves
Radio
Waves
Micro
waves
Infra
red
Ultra
violet
X-rays
Gamma
rays
Visible
Electromagnetic Spectrum
10,000

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Issues Regarding
Electromagnetic Spectrum
Capacity Availability
Efficiency Security

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Difference between Li-Fi AND Wi-Fi
Wi - FiLi - Fi 10 Gbps 150 mbps
Speed

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Difference between Li-Fi AND Wi-Fi
Wi - FiLi - Fi LIGHT
Radio
waves
Medium for
Data
Transmission

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Difference between Li-Fi AND Wi-Fi
Wi - FiLi - Fi
10,000 times
greater
Spectrum
Less
Spectrum
Range
Capacity

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Difference between Li-Fi AND Wi-Fi
Wi - FiLi - Fi
Li-Fi uses
power
efficiently
Radio base
stations
requires a lot
of energy
Efficiency

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Difference between Li-Fi AND Wi-Fi
Wi - FiLi - Fi
LEDs should
be available
Radio waves
have certain
limitations
Availability

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Difference between Li-Fi AND Wi-Fi
Wi - FiLi - Fi Higher Less
Security

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Five points need to know about Li-Fi
There is NO visible flicker.
Lights can be dimmed and still transmit.
Sunlight causes no interference.
Li-Fi uses power efficiently.
It does not need to be Line-Of-Sight to work.

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Applications
OF
Li – Fi

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In Street Lights

30. TMIn Transport System

31. TMIn Aircraft

32. TMUnderwater

33. TMIn Power Plants

34. TMInternet Of Things

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Potential Scenario of Li-Fi

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