LiFi Visible light Communication technology

Li-Fi, VISIBLE LIGHT COMMUNICATION

Contents
Introduction to Li-Fi
Li-Fi Construction / Working
Features of Li-Fi Technology
Advantages of Li-Fi Technology
Applications of Li-Fi Technology
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Li-Fi Vs Wi-Fi
Drawbacks & Ongoing Research

Introduction to Li-Fi / Visible Light Communication
What is Li-Fi / VLC ?
Use of the visible light portion of the electromagnetic
spectrum to transmit information.
LED light bulbs are turned into high speed wireless
communication devices, a bit like a Wi-Fi, hence the name Li-Fi
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Introduction to Li-Fi / Visible Light Communication
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Professor Harald Haas, an expert in optical wireless
communications
The D-Light project
Haas promoted this technology in his 2011 TED Global talk
Pure Li-fi, formerly pure VLC, is an original equipment
manufacturer (OEM) firm set up to commercialize Li-Fi products

Li-Fi Vs Wi-Fi
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PRESENT SCENARIO:
We have 1.4 million cellular radio waves base stations deployed.
We also have over 5 billion of mobile phones.
Wireless communication has become a utility like electricity & water.
Currently Wi-Fi uses Radio waves for communication.

Four Issues with Radio Waves:
Capacity
Efficiency
Availability
Security
Li-Fi Vs Wi-Fi
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Li-Fi, or light fidelity, refers to 5G visible light communication system
optical orthogonal frequency-division multiplexing (O-OFDM)
The LIFI product consists of 4 primary sub-assemblies
• Bulb
• RF power amplifier circuit (PA)
• Printed circuit board (PCB)
• Enclosure
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 The heart of LIFI is dielectric
material.
The dielectric material
serves two purposes
1) As a wave guide for the RF
energy transmitted by the PA
2) As an electric field concentrator
that focuses energy in the bulb.

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 If the LED is on, you transmit a digital 1, if it’s off you transmit a 0.
Convert Light to Data
 We have to just vary the rate at which the LED’s flicker
 Red, Green and Blue LEDs for different data channel.
Such advancements promise a theoretical speed of 10 GBps –i.e. you
can download a full high-definition film in just 30 seconds.

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1. Distance
2. Cost
3. Traffic Updates
4. Game Consoles
5. Television Interaction
Five Reasons to Promote Li-Fi Technologies
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Features of Li-Fi Technologies
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It is two way communications that uses medium of light.
It is a safe technology to transfer confidential matters.
Fluorescent light transmits a meaningful amount of data by
frequently flickering
The preferred light sources are fluorescent lights and LEDs.
Photo diodes are used as receivers which can turn light into electrical
signals
Every source of lights can be used as transmitter in VLC

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Advantages of Li-Fi Technologies
Long service life (10-15 years while usual bulbs last 1-2 years)
Energy Saving (8W LED bulb=60W ordinary Bulb)
Light emitting Diodes are a source of light (release large amount of
energy in the form of light)
Can be switched on/off at very high speed
Energy Efficiency
High speed data transfer
It’s main advantage is it’s bandwidth, It is 10,000 times than the
radio waves
Cost Benefits

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Applications of Li-Fi Technologies

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What will be the effect of interferences from external light sources like
sun light & normal bulbs?
What about the limited bandwidth of the existing copper cables used
for electrical connections?
Where do the connections uplink, how serious are the modifications
needed to the power grid?
How will other devices react if you inject a high frequency into mains?
Initial setup cost.
Presence of light is essential.
There should be line of sight.
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Drawbacks and ongoing Research of Li-Fi Technologies

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Li-Fi Concept Animated By K.SASHI KUMAR

LiFi Visible light Communication technology

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