Li - Fi: NEW TECHNOLOGY
SUBSTITUTE Wi - Fi?
Activities
browsing the internet (browsing) by using Wi-Fi (Wireless Fiderity) is already
familiar computer users. While Wi-Fi itself is a technology that utilizes
electronic equipment to exchange data wirelessly (using radio waves) through a
computer network. Then what is Li-Fi?
Li-Fi,
short for Light Fidelity, is Li-Fi is a wireless label for communication
systems using light as a carrier instead of the traditional radio frequency, as
in Wi-Fi. The term was first used by Harald Haas in his 2011 TED talk. The
technology has been demonstrated at the 2012 Consumer Electronics Show in Las
Vegas using a pair of Casio smartphones for data exchange by using light from
the intensities released from their screen, detected at distances up to ten
meters. Then how does Li-Fi work?
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| LIFI Simulation |
The
workings of the new Li-Fi technology is very simple. You must have a light
source at one end like an LED, as well as another light source such as a photo
detector (Light Sensor) at the other end. As soon as the LED starts to shine,
photo detector or light sensor at the other end will detect light and be
interpreted as binary 1. How will data be sent through this Li-Fi technology?
Turning on a certain amount of LED light will create a specific message that
will be sent. The flash of light will then be captured by a light detector that
will receive the message it conveys. Now, imagine if there are multiple LEDs
with different colors, blinking together and building enormous information to
send at once.For now it can be estimated if a green laser and a red laser are
used simultaneously will be able to transmit data at 1 Gbps speed.
The
biggest advantage of Li-fi technology is the ease of internet access in remote
areas that can not be reached by optical cable, in addition to Li-fi can also
be used to expand wireless networks at home, school, and even office. Li-Fi
technology can also be used to control traffic conditions by placing this new
technology into car LEDs. It can also be used with aircraft overhead lights. In
addition to these advantages, Li-Fi technology also has some challenges that
must be faced. Li-Fi technology requires the perfect line-of-sight to transmit
data. Another major challenge in this li-fi technology must be faced, namely
how data can be transmitted back to the transmitter optimally.
Li-Fi
has ten times higher data rates than WiFi. This is because the leds are
different from other types of lamps because they are semiconductors. These
characteristics give them the ability to switch - on and off in a few
nanoseconds or billions of seconds, when converted in terms of data rates, this
corresponds to 1 Gbits / s. If compared with WiFi that can only reach 100 Mbits
/ s data rate or 10 times lower than Li-Fi.
Li-Fi
technology can also reduce electromagnetic pollution generated by radio waves.
There are many advantages that we can get from this Li-Fi, for example when we
download a video of course we take a few minutes or if the video capacity is
large enough may be for hours if using Wi-Fi, but with Li-Fi we do not need to
wait a long time in just seconds. Then with these advantages whether you will
switch to using Li-Fi?
Quoted from: various
sources