Revealing the secrets of visible light communication: no electromagnetic pollution, no privacy leakage
The so-called semiconductor lighting is LED (light-emitting diode) lighting.
Faced with the global energy crisis and environmental protection pressure, semiconductor lighting that is energy-saving, environmentally friendly, long-lasting and safe is expected to enter the field of general lighting and is expected to surpass fluorescent lamps by 2010.
As a third-generation light source, at the same brightness, semiconductor lamps consume only one-tenth of the power of incandescent lamps, but their service life is extended 100 times, and they will not produce any waste during production and use. pollution to the outside world.
According to estimates, my country's lighting electricity consumption accounts for about 12% of the total electricity. In 2010, my country's total power generation will reach 3,000 billion kilowatt-hours. If semiconductor lighting enters one-third of the lighting market, electricity can be saved. 30%, that is, an annual electricity saving of 100 billion kilowatt-hours, which is at least equivalent to the power generation of the Three Gorges Project.
In addition to lighting, visible light can also be used for communication, that is, semiconductor lighting communication (intelligent machines now take into account both lighting and communication).
Primitive visible light communication appeared as early as 3,000 years ago. The Chinese built beacon towers on the border and used beacons to report enemy conditions.
With the development of human civilization, visible light communication methods such as semaphores and red, yellow and green traffic lights have appeared.
In modern times, the Internet, which is closely related to people's lives and has brought about earth-shaking changes in people's lives, also relies on optical communication to achieve "ubiquity" and "omnipotence". However, most of the carriers of optical communication Just use tangible optical fiber.
If we can combine the "ubiquitous" semiconductor lighting and Internet communications in the future, eliminating the need for separate lighting equipment and separate communication equipment, it will make people's lives more convenient and reduce costs. It reduces the purchase cost and greatly reduces energy consumption.
SolidStateLightingInformationNetwork , S2-Link) combines semiconductor lighting and communication network technology to create an indoor and outdoor "ubiquitous" communication network that can transmit data and control signals.
What are the differences and advantages of the semiconductor lighting information network compared to other wireless access networks: First, the "two-in-one" lighting communication naturally has the advantages of low energy consumption and less equipment required; secondly, the usual wireless access methods They are all based on radio frequency. Invisible rays constantly penetrate the human body. Although the impact is small, it is negative after all. Visible light communication is different. There is no electromagnetic pollution and no harm to the human body. Thirdly, people who have used the Internet have I have this experience: the more people surfing the Internet in a local area network, the slower the Internet speed will be, and the Internet browser will become "sluggish". Visible light communication is "broad and selfless". As long as there is light, it can be connected. You don’t have to worry about insufficient “bandwidth” to access the network; finally, current wireless access methods often bring security issues. Someone with “ulterior motives” may crack your wireless access key next door and spy on you. For privacy, you don’t have to worry about this problem with visible light communication. As long as there are obstacles that cannot penetrate the light, your privacy will not be leaked.
Exactly These unparalleled advantages give the semiconductor lighting information network a broad application prospect and huge application fields.
In addition to home network access, it is also required in outdoor public places, buildings, roads, etc.Semiconductor lighting communications can also be used in places where lighting is required, such as hospitals, aircraft interiors, security departments and other places that are sensitive to radio frequencies.
In addition, semiconductor lighting communications can also be used in the field of automatic identification.
Compared with currently widely used automatic identification technologies such as cameras, barcodes, magnetic cards, IC cards, etc., semiconductor lighting intelligent identification technology has longer-distance identification, non-contact operation, can identify high-speed moving objects, and is safe. Good sex and many other outstanding advantages.
Currently, developed countries and regions such as Japan, the United States, and South Korea have invested manpower and material resources in the research and development of related technologies.
Japan has established the Visible Light Communication Alliance to research and promote visible light communication networks.
The United States has established an LED Intelligent Lighting Center composed of Boston University, Rensselaer Institute of Technology, and the University of New Mexico.
They have developed a preliminary demonstration system; other representative research institutions include Samsung in South Korea, Oxford University in the UK, Siemens in Germany, France Telecom, etc. They have also implemented simple semiconductor lighting. communication.
In December 2007, the International Society of Communications and Electronics Engineers established the IEEE802.15 Committee and established a visible light communication research group to promote the standardization of short-range communication technology.
Compared with foreign countries, although our country has also carried out some basic research work, it is almost blank in terms of core technologies.
Faced with the raging international semiconductor lighting communication research, our country should base on the good foundation in the domestic semiconductor lighting field, quickly enter, accelerate the pace of research and development, occupy the technological commanding heights, and strive to occupy a place in the international semiconductor lighting intelligent information field. , and make due contributions to our country’s national economy and social development.
In accordance with the new development situation in the field of semiconductor lighting, the Institute of Semiconductors of the Chinese Academy of Sciences, relying on the Semiconductor Lighting R&D Center of the Chinese Academy of Sciences, organized the Optoelectronics R&D Center and the Optoelectronic System Laboratory to carry out research on semiconductor lighting intelligent information engineering, and established a scientific research team.
The Optoelectronic System Laboratory quickly established a semiconductor lighting communication system research and development team.
< p>After hard work and hard work, the semiconductor lighting communication demonstration prototype has been successfully developed and achieved leapfrog development.As of now, the third-generation semiconductor lighting communication prototype has a communication rate of 2Mbps and can be smooth. Transmitting video and voice signals; the third-generation semiconductor lighting control prototype can use LED lights to control multiple home appliances at the same time.
The prototype demonstration system has been praised by leaders such as President Lu Yongxiang and Vice President Jiang Mianheng of the Chinese Academy of Sciences, Director Wu Ling of the National Semiconductor Lighting Engineering Major Project Management Office, and Director Li Jinmin of the Institute of Semiconductor Research.
< p>The system is in the Demonstration Hall of the Institute of Semiconductors and the International Industrial Expo It was successfully displayed at the China Patent Expo, China International Semiconductor Lighting Expo, Guangzhou Digital Home Industry Expo, Shanghai World Expo Aviation Pavilion and Shanghai Eco Home, attracting widespread attention from the industry, as shown in Figures 1 and 2.
