Li Fi Technology

 

LiFi is a wireless communication technique that sends data and coordinates between devices using light. During a 2011 TED Global address in Edinburgh, Harald Haas coined the phrase.

 At his 2011 TED Global Talk, Professor Harald Haas invented the term "Li-Fi," introducing the concept of "wireless data from every light." He is a co-founder of pureLiFi with Dr. Mostafa Afgani and is a Professor of Mobile Communications at the University of Edinburgh.

The technology is comparable to Wi-Fi in terms of end usage, with the main technological distinction being that Wi-Fi transmits data by inducing a voltage in an antenna using radio frequency, whereas Li-Fi transmits data by modulating light intensity. Li-Fi has the potential to carry data at rates of up to 100 Gbit/s in theory. The capacity of Li-Fi to operate securely in environments that are otherwise sensitive to electromagnetic interference (e.g., airline cabins, hospitals, and military) is a benefit. Several groups throughout the world are working on the technology.

 

Li-Fi is a light communication technology that can carry data at high rates throughout the visible, ultraviolet, and infrared spectrums. Only LED bulbs can transmit data in visible light at the moment. In a similar way to Wi-Fi, Li-Fi is a derivation of optical wireless communications (OWC) technology, which employs light from light-emitting diodes (LEDs) as a medium to enable network, mobile, high-speed communication. From 2013 to 2018, the Li-Fi market was expected to increase at an annual pace of 82 percent, reaching a value of more than $6 billion. However, the business has not evolved as expected, and Li-Fi remains a niche sector used mostly to evaluate technologies.

Visible light communications (VLC) operates by rapidly switching the current to the LEDs off and on, too quickly for the human eye to see, therefore there is no flickering. Although Li-Fi LEDs must be turned on to transfer data, they may be dimmed to below human vision while still providing enough light to transmit data. When using the visible spectrum, this is also a key bottleneck of the technology because it is limited to lighting and not well suited to mobile communication. Handover technologies, which allow roaming between different Li-Fi cells, may allow for a smooth transition between Li-Fi. Light waves cannot pass through barriers, resulting in a far narrower range and lesser hacking potential than Wi-Fi. Li-Fi does not require a direct line of sight to broadcast a signal; light reflected off walls may attain 70 Mbit/s. Li-Fi has the advantage of not creating electromagnetic interference in electromagnetic sensitive places such as airline cabins, hospitals, and nuclear power plants.  Both Wi-Fi and Li-Fi use the electromagnetic spectrum to transport data, however Li-Fi employs visible, ultraviolet, and infrared light, whereas Wi-Fi uses radio waves. While the US Federal Communications Commission has warned of a future spectrum crisis due to Wi-near-full Fi's capacity, Li-Fi has almost no capacity constraints. The visible light spectrum is 10,000 times bigger than the radio frequency spectrum as a whole. Researchers were able to achieve data speeds of about 224 Gbit/s, which was far faster than average high-speed internet in 2013. The cost of Li-Fi is predicted to be 10 times lower than that of Wi-Fi. The disadvantages include a limited range, inadequate dependability, and hefty installation costs. 

Bg-Fi is a Li-Fi system that consists of a mobile application and a basic consumer product, such as an IoT (Internet of Things) device, that includes a color sensor, microcontroller, and embedded software. The color sensor on the consumer goods receives light from the mobile device display and turns it into digital information. Light emitting diodes allow the consumer goods to connect with the mobile device in real time.

The communications cannot pass through walls or doors using the short wave radiation utilised by Li-Fi. This increases network security and makes it easier to manage network access. Access to a Li-Fi channel is limited to devices within the room as long as transparent objects like windows are covered.

Added an extra layer of tiny cells ('attocells') to wireless infrastructures. The averting of a radio frequency spectrum shortage (10,000 times more capacity). allowing for extremely high peak data rates (10 Gbps).

The Internet-of-Things (IoT) is being enabled (100 times more devices).Secure wireless communication has been significantly improved (reduced interception of signals).Enhanced energy-efficiency by combining data communication and illumination (100 times energy reduction) (100 times energy reduction).All health issues are completely gone.