Alexander Graham Bell is known to the world for inventing telephones. However, he himself has always believed that one of his greatest accomplishments was actually a photophone, a communication device that never walked into human life and used a light beam instead of a wire as a signaling medium. Although light phone has never been the actual promotion, but Bell alma mater - the main mobile communication at the University of Edinburgh 席哈拉尔德 Haas (Harald Haas) said it believed such a light source based on technology of wireless communication devices have ushered in the first A spring.

As the co-founder and chief scientific officer of PureVLC, the University's spin-off agency, Professor Haas led the team to develop a new technology called LiFi. The technology uses standard light to wirelessly propagate data and is designed to challenge the ubiquitous WiFi network standard.

This month, PureVLC delivered the first product since its inception to a U.S. medical service provider, a device worth 5,000 euros. Friday, PureVLC also been installed in the system by a London Business School Bakersfield Lee to light as the Mayor of London Boris Johnson, live media (Boris Johnson) section of speech.

Compared with the Bell Age, a key technological change today is the appearance of light-emitting diodes (LEDs), Professor Haas pointed out.

"This idea has a completely new perspective," Professor Haas said. "The LEDs themselves are electronic circuits... They bring new opportunities."

The brightness of the LEDs can be changed very quickly, which allows them to transmit data to the photosensitive receiver at a very high speed.

A PureLVC model for the visitor's presentation easily spreads a high-quality video through the beam—until Professor Haas uses the body to block light transmission. However, the receiver has been designed to be sensitive enough to receive non-direct light sources, and the switching and flashing therein are not easily detectable by the naked eye.

Light-based transmission must have its own limitations. For example, Bell's light telephone has the problem of over-reliance on the sun - the call may be interrupted at any time due to passing through the clouds - and the short receiving distance is also a problem.

LEDs do not depend on the weather, but signals based on LiFi cannot penetrate walls or curtains. However, some supporters believe that this has become an advantage - because no one can enter the network from outside the visual range. PureVLC's first customer was particularly interested in this feature, thinking that it could provide higher security than WiFi.

Although LiFi Network will put forward some new requirements for the connection of lighting accessories infrastructure, Professor Haas said that the LED energy-saving lamps that are widely promoted today can be reasonably used and only need to be slightly modified. Just go.

LiFi technology also enables more efficient bandwidth utilization in buildings such as offices and schools. For example, each lighting only provides full-speed data transmission to the nearest person. The system is planned to be tested at the Bexley Business School in order to achieve a higher speed networking for every student.

PureVLC is one of many companies that wish to use light sources to spread data. The company will be renamed PureLiFi starting next month.

Cisco Japan has developed an application that uses light sources to exchange data between smartphones. Last month, Oledcomm of France also demonstrated a street light fixture based on LiFi technology.

Research institution MarketsandMarkets pointed out that visible light communication technology will be increasingly used as a complement to WiFi and mobile data networks, and the total sales of this market are expected to increase dramatically from 2012's 96 million to 2018's The scale of 6.14 billion US dollars.

Professor Haas believes that the major factor driving the development of optical communication technology in the future will be the crisis of the network carrying capacity that is already in imminent danger. Video streaming and other services that require a lot of bandwidth have made today's radio transmission technology impossible to bear.

IT equipment and service provider Cisco estimates that global mobile data traffic will reach 11.2 EB per month (1EB = 1,000,000 TB) in 2017, a 13-fold increase over 2012.

PureVLC will continue to serve the niche market to further verify technology until the “two to three years” after the outbreak of the carrying capacity crisis. Professor Haas pointed out that “the time will be the best time (LiFi technology) is imperative. ."

The fate of Bell's Ray phone reflects the need for a specific opportunity to advance the development of a new technology. Professor Haas believes that LiFi can ultimately become the pride of Scotland, just as Nokia used to be in the Finnish mobile communications industry.

"I firmly believe that we are all at the same starting point," said Professor Haas. "In the next ten years, we will formulate an industry, an industry that can have a huge impact."

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