Figure 4 Li-Fi System Connecting Devices in a Room
Related Figures (11)
a’ LILO V EOLULO Sl lined Mag ERA CREE n contrast to using radio waves, LiFi makes use of visible light. This allows LiFi to have access to a greater range of availabl frequencies as the visible light spectrum is 10,000 times larger than the entire radio spectrum. The visible light spectrum cover frequencies from 430,000 to 770,000 GHz and colors from near ultraviolet to near infrared. Information may be obtained withi vicinity of visible light by means of electronic gadgets with photodiode. This means that light bulbs can bring not only light bu wireless connection at same time anywhere where LEDs are used. Wi-Fi plays an efficient role in wireless data coverage witht buildings, while using Li-Fi we will provide excellent density data coverage in particular location without any radio interferenc issues. Li-Fi provides better latency, performance, accessibility, and security than Wi-Fi, and under laboratory conditions has eve! reached extreme speeds greater than 1 Gbps. [In the era of overcrowded (data communication) world, Li-Fi is a new way of wireless communication that uses LED lights t ransmit data wirelessly. Transmission of d current wireless networks that connect us to in the number of devices which access the ata is one of the most important day to day activities in the fast-growing world. Th the Internet are very slow when multiple devices are connected. Also, with the increas nternet, the availability of fixed bandwidth makes it much more difficult to enjoy hig! Jata transfer rates and to connect a secure network. Radio waves are just a small part of the electromagnetic spectrum available fo Jata transfer. Li-Fi has got a much broader spectrum for transmission compared to conventional methods of wireles communications that rely on radio waves. T' he basic ideology behind this technology is that the data can be transferred through LEI light by varying light intensities faster than the human eyes can perceive. This technology uses a part of the electromagneti spectrum that is still not greatly utilized- The Visible Spectrum, instead of Gigahertz radio waves for data transfer. Fig. 6 Speed Comparison Fig. 7 Block Diagram of Li-Fi sub-assemblies Fig. 8 Bulb Sub Assembly 28 Ss Fee eee ee The bulb sub-assembly is the main part of the Li-Fi emitter. It consists of a sealed bulb embedded in a dielectric material which serves two purposes: one, it acts as a waveguide for the RF energy transmitted by the PA (Power Amplifier) and two, it acts as an electric field concentrator that focuses the energy into the bulb. The collected energy from the electric field rapidly heats the material in the bulb to a plasma state that emits light of high intensity of Visible light spectrum. Figure 2 shows the sub-assembly of the bulb. There are numerous applications of Li-Fi technology, from public Internet access through existing lighting (LED) to auto-piloted cars that communicate through their headlights (LED based). Applications of Li-Fi can extend in areas where the Wi-Fi technology lacks its presence like aircrafts and hospitals (operation theatres), power plants and various other areas, where electromagnetic (Radio) interference is of great concern for safety and security of equipment and people. Since Li-Fi uses just the light, it can be used safely in such locations or areas. In future with the Li-Fi enhancement all the streetlamps can be transformed to Li-Fi connecting points to transfer data. As a result of it, it will be possible to access internet at any public place and street. 1) In Aircrafts: The passengers travelling in aircrafts get access to low speed Internet that too at a very high price. Also, Wi-Fi is Fig. 10 Application of Li-Fi in Aircrafts Fig. 11 Application of Li-Fi in Medical Field Fig. 13 Application of Li-Fi in Under Water Communication Fig. 12 Application of Li-Fi in Traffic Management
Connect with 287M+ leading minds in your field
Discover breakthrough research and expand your academic network
