Li-Fi the New
transmission media ahead of Wi-Fi and Wi-Max
This post
introduces to a new technology which can be used to transfer data by using
light, Google Already ahead in this type of connection in USA which usually
gives 1 Gbps speed.
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Till now LED’s were
considered just as an illuminating device but this July HERALD HAAS, a
professor of engineering at Edinburgh university discovered how led’ s can
serve wireless transmitting data access point. From any led source available
like led bulbs, street lamps or any lightning object can be used for
communication.
Just think the
speed of light = 299 792 458 m / s
What if the rate of
data communication has the same value i.e. transmit data at the speed of the
light? Well what i think that it will be simply described in one word that is
“amazing”. Haas has done it. According to him communication is possible using
the principle of orthogonal frequency-division multiplexing which is used in 4G
also. In this the digital data is encoded on multiple carrier signals.
Various intensities
of light transfer different signals. It is just like working on Morse code
using a torch or a light source (here the light source is led). Led’s are used
to transmit data in a rapid stream of binary code which are invisible to the
naked eye, can then be detected by a light-sensitive receiver.
Although our very
own Wi-Fi transmits data through radio waves which work on small fraction of
electromagnetic spectrum. The bandwidth is low and we all have faced this
problem. In college hostels, coffee shops the limited bandwidth spoils our
entire mood’ when the number of people transmitting data increases and our
speed starts decreasing. Similarly 3G, where the system is getting increasingly
congested thereby turning from a high speed transmitting data scheme to a
silkworm speed accessing method.
With this
technology accessing or transmitting data in aircrafts, where radio waves could
be a bit dangerous this technology will come into aid, it is of great use in
underwater oil rigs where communication through radio waves is not possible.
The interference level of this technology is low. It can lead up to speeds as
high as 100 MB per second.
Although this
technology sounds like a replacement to Wi-Fi but this high speed data transferring
technology also has some limitations that is the inability of light to pass
through obstacles. It cannot pass through walls and can be blocked. If the
light signal is blocked, we can seamlessly switch back over to radio waves
(Wi-Fi).
Now when we have to
transmit data we got both light and radio waves to use accordingly as per the
environment around us. The conclusion is that there is no dead end when it
comes to technology, science always shows the path.
