Li-Fi is a label for wireless-communication systems using light as a carrier instead of traditional radio frequencies, as in Wi-Fi Li-Fi should not be confused with the more general term visible light communications (VLC), which is the use of the visible light portion of the electromagnetic spectrum to transmit information. The term Li-Fi was coined by Professor Harald Haas from the University of Edinburgh in the UK and pureVLC’s CSO, and refers to a type of VLC technology that delivers a networked, mobile, high-speed communication solution in a similar manner as Wi-Fi. Therefore, the fundamental pre-requisite for Li-Fi is a bi-directional link over the same medium. The term was first used in this context by Harald Haas in his 2011 TED Global talk on visible light communication. In October 2011, a number of companies and industry groups formed the Li-Fi Consortium, to promote high-speed optical wireless systems and to overcome the limited amount of radio-based wireless spectrum available by exploiting a completely different part of the electromagnetic spectrum. The consortium believes it is possible to achieve more than 10 Gbit/s, theoretically allowing a high-definition film to be downloaded in 30 seconds.Li-Fi has the advantage of being able to be used in electromagnetic sensitive areas such as in aircraft, nuclear power plants, oil&gas installations and other places without causing interference. However, the light waves used cannot penetrate walls which makes Li-Fi significantly more secure relative to Wi-Fi
Chinese scientists have successfully developed a new cheaper way of getting connected to internet by using signals sent through light bulbs instead of radio frequencies as in Wi-Fi , a move expected to radically change process of online connectivity. Four computers can be connected to internet through one-watt LED bulb using light as a carrier instead of traditional radio frequencies, as in Wi-Fi, said Chi Nan, an information technology professor with Shanghai's Fudan University. Under the new discovery dubbed as 'Li-Fi', a light bulb with embedded microchips can produce data rates as fast as 150 megabits per second, which is speedier than the average broadband connection in China, said Chi, who leads a Li-Fi research team, including scientists from the Shanghai Institute of Technical Physics of the Chinese Academy of Sciences. The term Li-Fi was coined by Harald Haas from the University of Edinburgh in the UK and refers to a type of visible light communication technology that delivers a networked, mobile, high-speed communication solution in a similar manner as Wi-Fi. With Li-Fi cost-effective as well as efficient, netizens should be excited to view 10 sample Li-Fi kits that will be on display at the China International Industry Fair that will kick off on November 5 in Shanghai. The current wireless signal transmission equipment is expensive and low in efficiency, Chi said. "As for cell phones, millions of base stations have been established around the world to strengthen the signal but most of the energy is consumed on their cooling systems," she said. "The energy utilisation rate is only 5%," state-run Xinhua news agency quoted her as saying. Li-Fi was touted as a boon to China netizen community, the highest in the world with about 600 million connections. Compared with base stations, the number of light bulbs that can be used is practically limitless. Meanwhile, Chinese people are replacing the old-fashioned incandescent bulbs with LED light bulbs at a fast pace. "Wherever there is an LED light bulb, there is an Internet signal. Turn off the light and there is no signal," Chi said. There is, however, still a long way to go to make Li-Fi a commercial success. "If the light is blocked, then the signal will be cut off," Chi said. More importantly, according to the scientist, the development of a series of key related pieces of technology, including light communication controls as well as microchip design and manufacturing, is still in an experimental period.
Chinese scientists have successfully developed a new cheaper way of getting connected to internet by using signals sent through light bulbs instead of radio frequencies as in Wi-Fi , a move expected to radically change process of online connectivity. Four computers can be connected to internet through one-watt LED bulb using light as a carrier instead of traditional radio frequencies, as in Wi-Fi, said Chi Nan, an information technology professor with Shanghai's Fudan University. Under the new discovery dubbed as 'Li-Fi', a light bulb with embedded microchips can produce data rates as fast as 150 megabits per second, which is speedier than the average broadband connection in China, said Chi, who leads a Li-Fi research team, including scientists from the Shanghai Institute of Technical Physics of the Chinese Academy of Sciences. The term Li-Fi was coined by Harald Haas from the University of Edinburgh in the UK and refers to a type of visible light communication technology that delivers a networked, mobile, high-speed communication solution in a similar manner as Wi-Fi. With Li-Fi cost-effective as well as efficient, netizens should be excited to view 10 sample Li-Fi kits that will be on display at the China International Industry Fair that will kick off on November 5 in Shanghai. The current wireless signal transmission equipment is expensive and low in efficiency, Chi said. "As for cell phones, millions of base stations have been established around the world to strengthen the signal but most of the energy is consumed on their cooling systems," she said. "The energy utilisation rate is only 5%," state-run Xinhua news agency quoted her as saying. Li-Fi was touted as a boon to China netizen community, the highest in the world with about 600 million connections. Compared with base stations, the number of light bulbs that can be used is practically limitless. Meanwhile, Chinese people are replacing the old-fashioned incandescent bulbs with LED light bulbs at a fast pace. "Wherever there is an LED light bulb, there is an Internet signal. Turn off the light and there is no signal," Chi said. There is, however, still a long way to go to make Li-Fi a commercial success. "If the light is blocked, then the signal will be cut off," Chi said. More importantly, according to the scientist, the development of a series of key related pieces of technology, including light communication controls as well as microchip design and manufacturing, is still in an experimental period.
No comments:
Post a Comment