Light Wi-Fi: Wireless network that is 100 times faster than existing technology

Almost everyone has experienced the irritability of the slow speed of the wireless network.There are more and more data transmitted by family wireless equipment, and it will only grow and cause wireless network congestion.Researchers at Eindhoven University of Technology (TU/E) proposed a surprising solution: a wireless network based on security infrared.Not only does the network speed improvement (40Gbps per ray), but also because each device has its own proprietary infrared rays, it does not need to be shared with other devices.Last week, Joanne Oh obtained her doctorate.

?? The system is relatively simple, and the cost built in principle is also low.Wireless data comes from several central light antennas, such as installed on the ceiling.The light antennas can accurately manage light supplied by optical fiber.Because there is no moving part in the system, there is no need to maintain and power supply: the antenna contains a pair of grating (passive diffraction grating) that emit different wavelengths from different angles.Change the light wavelength and change the direction of light.Because the infrared rays of the safety wavelength are used, they cannot be seen by human eyes and will not cause any harm.

?? No interference

?? If you move to the coverage of the optical antenna when you use your mobile phone or tablet, then other light antennas will take over.The network uses the wireless signal returned by transmission to accurately track the location of each wireless device.It is very simple to add a device: the same light antenna allocate different wavelengths to different devices, so the network will not share the network between the equipment.In addition, the neighbor's wireless network will not interfere with you.

?? Data transmission capacity of light

?? The current wireless network uses 2.5GHz or 5GHz wireless signals.The new system uses the infrared rays with wavelengths above 1500 nanometers, which are thousands of times the current network frequency, which can reach 200THz, so the data transmission capacity is also stronger.Joanne Oh even achieved the transmission speed of 42.8Gbps within 2.5m. In contrast, the average connection speed of the Netherlands is only one -minute (17.6Mbps). Even if you have the best wireless system, the speed will not exceed 300Mbps without 300MbpsIt is only one percent of the speed of wireless network in the study.However, the system has only used light to download and test. Because most applications have low requirements for upload speed, upload still uses wireless signals.

?? Five years

?? Dr. Joanne's work is part of the larger Browse project. The project is led by Broadband Communication Technology Ton Koonen and is funded by the European Research Committee.Joanne Oh focuses on realizing data transmission technology through direct infrared. The work of other doctoral students includes the precise positioning of all wireless devices and the central optical fiber network research connecting the optical antenna.KOONEN expects to promote the use of this technology within five years. He believes that the first equipment that uses this technology should be device that requires high -speed data transmission such as video surveillance, notebooks or tablets.

?? Connect multiple devices at the same time

?? Koonen's group is not the only research room optical wireless network. There are many other universities and research institutes internationally under the interior LED light transmission data.However, the disadvantage of these methods is that the bandwidth is low and the wireless network must be shared between the devices.Other groups try to use mobile mirror surface to guide infrared rays, but this requires active control of the mirror. It consumes energy and a mirror can only guide one light at a time.The grating used by Koonen and Joanne can handle many light, so it can connect the same -desk equipment at the same time without interference.