The fastest speed of WiFi light can be increased by 14 times and can be used commercially in three years
A wireless network that uses reflected infrared light instead of radio waves to transmit data in the air has reached a speed of one gigabit per second-this is 6 to 14 times faster than the fastest WiFi network currently available.
This optical network is particularly suitable for use in hospitals, aircraft and factories, because in these areas, radio frequency transmission can interfere with navigation equipment, medical equipment or control systems, and optical networks can provide faster and safer communications. Another potential application is the wireless network used in home theaters: the system transmits 1.6 Gbits of data per second, allowing two independent high-definition TV channels to be propagated in the room, exceeding the bandwidth of all existing radio systems.
Optical wireless network: Super fast and higher security
This experimental system was jointly built and tested by graduate student Jaril Fadrulla of Pennsylvania State University and Mohsen Kevlard, a professor of electrical engineering at the school and director of the Information and Communication Technology Research Center-focusing on Infrared light on the ceiling, while using a specially modified photodetector to collect the reflected light, the data can be transmitted in the room. The measurement results show that the data transmission speed that the system can support far exceeds 1G b / s.
In fact, since the late 1970s, researchers have studied indoor optical communications. The engineers at the IBM Zurich Laboratory built the first working system at the time. But because the Internet was still in its infancy at that time, and there was no need for a wireless broadband system, this technology stalled. It was only in recent years that its appeal became apparent again.
"Kefrad's demonstration is the fastest indoor wireless optical network demonstrated so far." Said Valencia M. Joyner, an assistant professor of electrical and computer engineering at Tufts University. She pointed out that the transmission distances achieved by Kevlar and Fadrulla, as well as their use of diffuse light instead of point-to-point optical systems, are very important. "There are many challenges to the demonstration of indoor optical signal high-speed transmission capabilities," she said. "He was able to use scattered light to demonstrate a system with a speed of 1Gb / s. This result is quite significant. It greatly reduces the complexity of the transceiver system."
Intel (blog), Siemens immersed in trial is expected to be commercially available within three years
The experimental system built by Kevlar and Fadroula uses low-energy infrared lasers, which can prevent potential damage to the eyes or skin. They focused the light through a lens to create an elliptical spot on the ceiling; they then used a highly sensitive light detector called an avalanche photodiode to collect the light reflected from the ceiling. They used a plastic holographic lens to collect enough reflected light from the ceiling spot and focus it on the photosensitive area of ​​the photodiode. By using these lenses, Kevlar and Faderula can transmit 1G b / s optical signals in a room with an area of ​​8m × 4m.
Free-space optical communication networks have long been used for long-distance broadband data transmission, but the high energy of lasers, the requirement for unobstructed line of sight, and the extremely precise alignment requirements between receivers and transmitters limit their availability. The low-energy scattered light method chosen by Kevlar and Fadroula does not require precise alignment and is more suitable for indoor communication. Kevlard said their system can also use visible light and ultraviolet light, working like infrared light.
Intel, Siemens, Sony, Samsung, Mitsubishi, and Sanyo are all engaged in optical wireless network research. Several of these companies are members of the Infrared Data Association (InfraredDataAssoci-aTIon, IrDA). This industry organization is developing infrared wireless communications. technical standard. IrD A recently announced the G igaIR standard for an extremely short range line-of-sight infrared communication link operating at 1G b / s. The IEEE 802.15 working group that sets standards for wireless personal area networks is creating standards for wireless networks that use visible light.
Kevlar said that before optical wireless networks become a reality, a lot of engineering must be done. In the experimental system, he and Fadrula used lasers, transmitters, and receivers that were not used for communication; all these devices must be optimized for data networking. However, Kevlar said that if the development of white LED lamps for indoor lighting continues to maintain its current speed, then there may be wireless optical networks available within three years. Consumer demand. "
Industry statement
"Optical wireless networks can reduce interference and provide higher security than radio networks. Radio signals can penetrate walls and doors, but light cannot. This makes optical wireless networks easy to frequency reuse and difficult to intercept transmissions. He also pointed out that unlike radio frequency, the spectrum of various types of light (including infrared, visible, and ultraviolet) is not subject to global regulation. This makes optical wireless networks easier to commercialize.
——— Kevlar, Professor of Electrical Engineering, Pennsylvania State University
"The speed of light WiFi may become the next generation of wireless communication technology. Light will bring a higher data rate than radio frequency, and the radio frequency spectrum is already very crowded."
——— Xu Zhengyuan, Professor of Electrical Engineering, University of California, Riverside
Magnetic Bluetooth Earphone,Running Wireless Earphone,Earphones With Bluetooth,Wireless Earphone
Dongguan Fangbei Electronic Co.,Ltd , https://www.connectorfb.com