Li-Fi is here! LED bulbs go faster than 5G Wi-Fi
Nowadays, families are using more and more LED lights, and with the development of technology, LED lights will open a new way for wireless devices to access wireless networks, and Li-Fi (Light Fidelity, LED lights) Visible light wireless communication) Wireless networks are faster than Wi-Fi wireless networks, both in terms of network bandwidth and response speed. At the very least, at the University of Adeburg, Harald Hass, president of the School of Mobile Communications, hopes so.
Haas said, “All the components and all the technologies are already there. Now you just need to put them together to get the Li-Fi optical network up and running.”led bulb light
In addition to researchers at the University of Edinburgh, Haas's research group also includes researchers from the University of Cambridge, Oxford University, and the University of St. Andrews's University of Lights. The subject has been in existence for four years and has been awarded the British Engineering and Physical Sciences. The research committee is supported by 5.8 million pounds. The research team studied ultra-parallel visible light communication, which uses multiple colors of light bulbs to provide high-bandwidth network connections within a few meters. Researchers say Li-Fi optical networks can complement or even partially replace traditional Wi-Fi networks. But replacing RF technology with Wi-Fi is a fairly difficult war.led tube light
At the IEEE Photonics Conference in October this year, members of the Joint Task Force demonstrated what they have achieved. Their team demonstrated the use of commercial red, green and blue LED bulbs as signal emitters and diodes to detect light. In this way, they created a device that can accept and send data with a data throughput of 100 Mb/s. If the signal is only transmitted in one direction, the rate will increase to 155 Mb/s.led flood light
But Haas said that the current LED technology and the LED lights are both transmitters and receivers, so the speed is not fast. The members of the joint research team have actually developed a better LED bulb with a 5 mW LED light and a high-bandwidth diode as the receiver. The data transfer rate is close to 4 Gb/s. After using a simple lens for distance enhancement, the LED lamp can achieve a data transfer rate of 1.1 Gb/s over a range of 10 meters. Haas also said that they will soon increase the rate to 15Gb/s. The 802.11ad Wi-Fi standard uses the 60 GHz RF band at a rate of approximately 7 Gb/s, so the Li-Fi optical network is twice as fast.
They used an avalanche photodiode as a wireless signal receiver for Li-Fi devices. In avalanche photodiodes, when a single photon hits the receiver, it triggers an electronic "avalanche" that increases the strength of the signal. Haas' team developed the first Li-Fi receiver with integrated avalanche photodiode CMOS at the Li-Fi R&D Center. This chip has only 49 diodes on a 7.8 square millimeter chip.led flame bulb
At the same time, the Fraunhofer Institute in Germany presented the Li-Fi wireless hotspot at the 2014 Munich Electronic Fair. Frank Deicke, director of the project at the Fraunhofer Institute, said the system is more like an infrared system, targeting industrial customers rather than ordinary consumers. The hotspot transmits point-to-point data connections at rates up to 1 Gb/s.
Deicke said, "The transmission rate exceeds the USB cable. For most wireless technologies, such as Wi-Fi and Bluetooth, it is a big challenge to exceed USB." Deicke said that the technology has another big advantage, Wi The delay of the -Fi signal transmission is generally calculated in milliseconds, while the delay of Li-Fi is calculated in microseconds (1000 microseconds = 1 millisecond). In industrial applications, data transmission needs to go through sensors, actuators, and control units, so low latency, high rate Li-Fi is more useful than Wi-Fi. He said, "We don't want to replace Wi-Fi technology. This is not our goal."led ceiling light
But Deicke said Li-Fi can complement existing communication technologies including Wi-Fi and Ethernet. So far, his team has not applied technology to common light bulbs.
European researchers and network companies are preparing to push Li-Fi technology to the consumer market. The group is working on a project called Advanced Convergence and Managed Innovation Network Design (ACEMIND) that helps users manage the home or small business's local network. ACEMIND includes several projects and tested different technologies, including Li-Fi. Dmitris Katsianis, a researcher at the University of Athens who participated in the project, believes that Li-Fi technology will enter the practical phase in the next five years. Li-Fi has great advantages in some electromagnetic sensitive places, such as hospitals, engine rooms, power stations, etc.led high bay light
Haas is targeting a larger market. He hopes that LED lights will evolve from the source of light, just like the mobile phone of the year, has now evolved into a mobile computing device. In the next 25 years, every light bulb in your home will have the same computing power as today's mobile phones. In the future, lighting is just a function of a light bulb.
Dalian Xinghai Technology Co., Ltd.