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Li-Fi
Li-Fi (commonly referred to as LiFi) is a wireless communication technology which utilizes light to transmit data and position between devices. The term was first introduced by Harald Haas during a 2011 TEDGlobal talk in Edinburgh.
Li-Fi is a light communication system that is capable of transmitting data at high speeds over the visible light, ultraviolet, and infrared spectrums.
In terms of its end user, the technology is similar to Wi-Fi – the key technical difference being that Wi-Fi uses radio frequency to induce an electric tension in an antenna to transmit data, whereas Li-Fi uses the modulation of light intensity to transmit data. Li-Fi is able to function in areas otherwise susceptible to electromagnetic interference (e.g. aircraft cabins, hospitals, or military applications).
Li-Fi is a derivative of optical wireless communications (OWC) technology, which uses light from light-emitting diodes (LEDs) as a medium to deliver network, mobile, high-speed communication in a similar manner to Wi-Fi. Projections of the LiFi market varies greatly between analysts. They range from a compound annual growth rate (CAGR) of 17% to 63% from 2023 to 2030 and projections suggest it will grow to between $10.9 billion and $116.96 billion by 2030.
Visible light communications (VLC) works by switching the current to the LEDs off and on at a very high speed, beyond the human eye's ability to notice. Technologies that allow roaming between various Li-Fi access points, also known as handover, may allow seamless transition between such access points. The light waves cannot penetrate walls which translates to a much shorter range, and a lower hacking potential, relative to Wi-Fi. Direct line of sight is not always necessary for Li-Fi to transmit a signal as light may reflect off walls, mirrors or other reflective objects.
Li-Fi can potentially be useful in electromagnetic sensitive areas without causing electromagnetic interference. Both Wi-Fi and Li-Fi transmit data over the electromagnetic spectrum, but whereas Wi-Fi utilizes radio waves, Li-Fi uses visible, ultraviolet, and infrared light. Researchers have reached data rates of over 224 Gbit/s. Li-Fi was expected to be ten times cheaper than Wi-Fi. While several Companies produce Li-Fi products such as PureLiFi, Signify, Oledcomm, Terra Ferma and others; Wi-Fi and cellular remain the predominant communications technology for consumers, business, industrial and military applications. The first commercially available Li-Fi system was presented at the 2014 Mobile World Congress in Barcelona.
Although Li-Fi LEDs would have to be kept on to transmit data, they could be dimmed to below human visibility while still emitting enough light to carry data. This is also a major bottleneck of the technology when based on the visible spectrum, as it is restricted to the illumination purpose and not ideally adjusted to a mobile communication purpose, given that other sources of light, for example the sun, will interfere with the signal. Most products available today use the near IR (NIR) spectrum, specifically between 780 nm and 2500 nm, therefore this a crucial part of LiFi technology, offering a large bandwidth for high-speed data transfer.
Since Li-Fi's short wave range is unable to penetrate walls, transmitters would need to be installed in every room of a building to ensure even Li-Fi distribution. The high installation costs associated with this requirement to achieve a level of practicality of the technology is one of the potential downsides.
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Li-Fi
Li-Fi (commonly referred to as LiFi) is a wireless communication technology which utilizes light to transmit data and position between devices. The term was first introduced by Harald Haas during a 2011 TEDGlobal talk in Edinburgh.
Li-Fi is a light communication system that is capable of transmitting data at high speeds over the visible light, ultraviolet, and infrared spectrums.
In terms of its end user, the technology is similar to Wi-Fi – the key technical difference being that Wi-Fi uses radio frequency to induce an electric tension in an antenna to transmit data, whereas Li-Fi uses the modulation of light intensity to transmit data. Li-Fi is able to function in areas otherwise susceptible to electromagnetic interference (e.g. aircraft cabins, hospitals, or military applications).
Li-Fi is a derivative of optical wireless communications (OWC) technology, which uses light from light-emitting diodes (LEDs) as a medium to deliver network, mobile, high-speed communication in a similar manner to Wi-Fi. Projections of the LiFi market varies greatly between analysts. They range from a compound annual growth rate (CAGR) of 17% to 63% from 2023 to 2030 and projections suggest it will grow to between $10.9 billion and $116.96 billion by 2030.
Visible light communications (VLC) works by switching the current to the LEDs off and on at a very high speed, beyond the human eye's ability to notice. Technologies that allow roaming between various Li-Fi access points, also known as handover, may allow seamless transition between such access points. The light waves cannot penetrate walls which translates to a much shorter range, and a lower hacking potential, relative to Wi-Fi. Direct line of sight is not always necessary for Li-Fi to transmit a signal as light may reflect off walls, mirrors or other reflective objects.
Li-Fi can potentially be useful in electromagnetic sensitive areas without causing electromagnetic interference. Both Wi-Fi and Li-Fi transmit data over the electromagnetic spectrum, but whereas Wi-Fi utilizes radio waves, Li-Fi uses visible, ultraviolet, and infrared light. Researchers have reached data rates of over 224 Gbit/s. Li-Fi was expected to be ten times cheaper than Wi-Fi. While several Companies produce Li-Fi products such as PureLiFi, Signify, Oledcomm, Terra Ferma and others; Wi-Fi and cellular remain the predominant communications technology for consumers, business, industrial and military applications. The first commercially available Li-Fi system was presented at the 2014 Mobile World Congress in Barcelona.
Although Li-Fi LEDs would have to be kept on to transmit data, they could be dimmed to below human visibility while still emitting enough light to carry data. This is also a major bottleneck of the technology when based on the visible spectrum, as it is restricted to the illumination purpose and not ideally adjusted to a mobile communication purpose, given that other sources of light, for example the sun, will interfere with the signal. Most products available today use the near IR (NIR) spectrum, specifically between 780 nm and 2500 nm, therefore this a crucial part of LiFi technology, offering a large bandwidth for high-speed data transfer.
Since Li-Fi's short wave range is unable to penetrate walls, transmitters would need to be installed in every room of a building to ensure even Li-Fi distribution. The high installation costs associated with this requirement to achieve a level of practicality of the technology is one of the potential downsides.
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