Everyone knows about Wi-fi technology as it is much more
used by people. Over 61% of the world's internet users use Wi-fi technology. It
provides better transmission of data which is necessary for a certain process.
Even it supports the faster transmission of data, It is highly targeted by
hackers and crackers due to unwanted expansion of its data process area i.e.
sometimes the data can also be accessed outside of the user's area as the radio
waves escape from the user bound. Due to radio wave interference, the speed
varies. To conquer these problems, Li-fi technology was introduced but is not
popular among the average internet user.
WHAT IS LiFi?
Li-Fi is one of the latest communication technology and
it can be used to serve the dual purpose of illuminating the house as well as
transferring data (communicating with devices).Li-Fi(Light Fidelity)technology
is the same as that of the Wi-Fi technology, but in this case, Radio waves are
replaced by light. Li-Fi technology makes use of visible light which makes
the transmission speed to the peak. Li-Fi technology mostly uses the LED bulbs,
because it gives the constant output for the constant input, even the minute
change in the input causes the same range of change in the output.
HISTORY OF LiFi
The term Li-Fi was first coined by the University of Edinburgh, however, this technology was first introduced by Herald Has, a German professor, and physicist. He introduced and demonstrated it at a TED talk in July 2011. He believed light bulbs could act as wireless routers for Data transmission. His demonstration showed how changes in the amplitude of a light bulb at high speeds can be used for energy transmission. He demonstrated the use of LED for the transmission of a high-definition video and then showed the same video to the audience. He also formed a company later on by the name of pureLiFi. Since then the use of this wireless technology has increased, now being deployed in more than 20 countries.
WORKING
Li-Fi uses visible light to transfer the data. If the current passes to the LED bulb are more it can be sent as 1 and low current produces 0's. The light produces millions of fluctuations that can't be seen through the naked eye. On average human eye can intercept a frame rate of about 150 frames per second (and maximum up to 1000 fps or Hz) and hence can notice the disturbance in the light which is flicker equal to or less than 150 frames per second (150 Hz). So, if we can make the lights flicker at higher rates then the human would see it as if it is constantly illuminated (as we see the bulbs in our homes which also flicker at around 50–60 Hz). The modem acts as the intermediate between the network and the LED driver. LED is a special data transmitter for LED bulbs. Data through the LED bulbs are received by the photoreceiver and further accessed.
ADVANTAGES
- Theoretically, it has been proved that it supports high transmission speed up to 10gbps which is more than Wi-Fi technology.
- It supports more users to make use of the data.
- The avoidance of the radio frequency spectrum crunch.
- Complete elimination of health concerns.
- Assures user’s security.
- Supports duplex mode.
- Enhanced energy efficiency by combining data communication and illumination.
- Enabling of the Internet-of-Things(100 times more devices).
DISADVANTAGES
- The Internet cannot be accessed without a light source.
- As the light cannot penetrate walls, the signal’s range is limited by the physical barriers.
- Any other light source can interfere with the signals. it is considered to be a great drawback.
- It needs new infrastructure to be built.
Despite being a speedier network technology, It is not implemented all over the world. because without the light this technology is not possible. This flaw might be rectified in future to create the Li-Fi world.
This is a reference Blog