Light Fidelity, otherwise known as Li-Fi is a new evolutionary technology which was first proposed by Harald Haas, a German physicist in a TED Global Talk on Visible Light Communication. Li-Fi, similar to our current Wi-Fi, is a wireless optical networking technology that uses light emitting diodes also know as LEDs for transmitting the data. Li-Fi uses the light as a medium for the transmission of high-speed data/communication which is very much similar to Wi-Fi and also falls within the IEEE 802.15.7 standard of Institute of Electrical and Electronics Engineers (IEEE). The IEEE 802.15.7 is similar to the IEEE 802.11 in which the Wi-Fi operates. li fi is the best for high-density wireless data coverage in confined places. This technology is more useful in areas where radio interference issues are high. So basically li-fi send the data through LED light by taking the fiber out of the fiber optics.
How It Work’s ?
Li-fi is potential can be the future of data transmission which is fast and affordable. The visible light electromagnetic spectrum is used for data transmission and illumination. The rays of light transmit information in a wireless medium which is also fast. The main parts of a li-fi system are:
Communication rate of 100 Mbps or more can be attained with a few other techniques. We can get up to 10gbps if the lights are arranged in an array transmitting different streams of data which is also known as parallel data transmission.
There are four subassemblies:
There is a LED transmitter and a light sensor on the object receiving the data. The transmitter is inputted with the data which is then encoded to VLC (visible light communication) or light by stretching the flickering rate at which the LEDs get turned on and off into binary format in different strings. In other simple words, when you switch on the light, the binary code generated as a logical 1 and when it is turned of it’ll be a logical 0 which means the transmitter identifies if it’s on or off.
The LED is connected to the internet through a modem and at the receiver’s end, the data gets decoded which then displays if it is connected or not. The receiver is coded to recognize 1s as when LED is on and 0s when it is off. So each light beam received will eventually provide a range of 100s of Mbps of data.
What is the major difference between Wi-Fi and Li-Fi?
The key difference is that the li-fi uses VLC radio technology which is useful to receive high-speed wireless communication. This is done by using light waves. Whereas the Wi-Fi uses radio waves. This enables the possibility of the li-fi to reach places of high density that Wi-Fi is not able to.