Light Fidelity(Li-Fi) is a bidirectional, high speed and fully networked wireless communication technology similar to Wi-Fi. The term was coined by Harald Haas and is a form of visible light communication and a subset of optical wireless communications (OWC) and could be a complement to RF communication(Wi-Fi or Cellular network), or even a replacement in contexts of data broadcasting. It is so far measured to be about 100 times faster than some Wi-Fi implementations,reaching speeds of 224 giga bits per second. It is wireless and uses visible light communication or infra-red and near ultraviolet (instead of radio frequency waves) spectrum, part of optical wireless communications technology, which carries much more information, and has been proposed as a solution to the RF-bandwidth limitations.
Light Fidelity(Li-Fi) is a bidirectional, high speed and fully networked wireless communication technology similar to Wi-Fi. The term was coined by Harald Haas and is a form of visible light communication and a subset of optical wireless communications (OWC) and could be a complement to RF communication(Wi-Fi or Cellular network), or even a replacement in contexts of data broadcasting. It is so far measured to be about 100 times faster than some Wi-Fi implementations,reaching speeds of 224 giga bits per second. It is wireless and uses visible light communication or infra-red and near ultraviolet (instead of radio frequency waves) spectrum, part of optical wireless communications technology, which carries much more information, and has been proposed as a solution to the RF-bandwidth limitations.
In simple terms, Li-Fi can be thought of as a light-based Wi-Fi. That is, it uses light instead of radio waves to transmit information. And instead of Wi-Fi modems, Li-Fi would use transceiver-fitted LED lamps that can light a room as well as transmit and receive information. Since simple light bulbs are used, there can technically be any number of access points.
This technology uses a part of the electromagnetic spectrum that is still not greatly utilized- The Visible Spectrum. Light is in fact very much part of our lives for millions and millions of years and does not have any major ill effect. Moreover there is 10,000 times more space available in this spectrum and just counting on the bulbs in use, it also multiplies to 10,000 times more availability as an infrastructure, globally.
Lifi Technology presentation best view in powerpoint 2013,16
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Li-Fi can be thought of as a light-based Wi-Fi. That is, it uses light instead of radio waves to transmit information. And instead of Wi-Fi modems, Li-Fi would use transceiver-fitted LED lamps that can light a room as well as transmit and receive information. Since simple light bulbs are used, there can technically be any number of access points.
Light Fidelity (Li-Fi) is a bidirectional, high speed , fully networked wireless communication technology similar to Wi-Fi. Li-Fi was first put forward by Professor Harald Haas,University of Edinburgh, during a TED Talk in 2011. Li-Fi is a form of visible light communication and a subset of optical wireless communications (OWC) and could be a complement to RF communication (Wi-Fi or Cellular network), or even a replacement in contexts of data broadcasting. It is so far measured to be about 100 times faster than some Wi-Fi implementations, reaching speeds of 224 gigabits per second.
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2. What is Li-Fi?
Light Fidelity or Li-Fi is a Visible
Light Communications (VLC) system
running wireless communications
travelling at very high speeds.
Li-Fi uses common household LED
(light emitting diodes) lightbulbs to
enable data transfer, boasting
speeds of up to 224
gigabits per second.
3. The fastest physical quantity is “LIGHT”.
And it Has the capacity of 299792458
mts/sec i.e., approximately 3×108m/s to
travel on the same basis the LI-FI
technology has also works. To
demonstrate you the speed….
A 224Gbps speed would technically
allow for 18 movies of 1.5GB each to be
downloaded in a single second.
4. BASEHISTORY:
The term Li-Fi was coined by University of
Edinburgh Professor Harald Haas during a
TED Talk in 2011. Haas envisioned light bulbs
that could act as wireless routers.
Harald Haas, a professor at Edinburgh
University is a busy man. In 2011 he invented
a wireless broadband technology that uses
LEDs to send data at hundreds of times the
speed of today's wi-fi networks.
5. How it works…?
Li-Fi and Wi-Fi are quite similar as both
transmit data electromagnetically.
However, Wi-Fi uses radio waves while
Li-Fi runs on visible light.
As we now know, Li-Fi is a Visible Light
Communications (VLC) system. This
means that it accommodates a photo-
detector to receive light signals and a
signal processing element to convert the
data into 'stream-able' content….
6. •An lightbulb is a semi-conductor light
source meaning that the constant
current of electricity supplied to an LED
lightbulb can be dipped and dimmed, up
and down at extremely high speeds,
without being visible to the human eye.
•For example, data is fed into an LED
light bulb (with signal processing
technology), it then sends data
(embedded in its beam) at rapid speeds
to the photo-detector (photodiode).
7. The tiny changes in the rapid dimming of
LED bulbs is then converted by the
'receiver' into electrical signal.
The signal is then converted back into a
binary data stream that we would
recognize as web, video and audio
applications that run on internet enables
devices.
