Siemens researchers have bettered their own record, going from 200 Mbps, now to 500 Mbps.Researchers at Siemens, Munich in collaboration with researchers from the Heinrich Hertz Institute in Berlin have been able to achieve a new record in wireless data transfer speeds using Ostar LED, which is the brightest white LED available today. Data is transferred by modulating the amount of light emitted by the LED via the power supply. The changes in brightness of light due to modulation is detected by a photodetector and converted back into electrical pulses thus resulting in wireless data transfer.
The researchers have been able to successfully transmit data at up to 500 Mbps over a distance of five meters. When five LEDs are combined, it is possible to transfer the data over longer distances at about 100 Mbps.
The press release from the company states, "Increasingly, wireless networks are compromised by the fact that in many buildings the three independent WLAN frequency bands are multiply occupied, which leads to collisions among the data packets. In a situation like this, visible light, as a currently unused and license-free medium, offers a suitable alternative. A further advantage is that this form of data transfer is impervious to interception. Only the photodetector that is positioned directly within the light cone is able receive the data. In other words, it is impossible to 'tap' the data transported in the light beam."
The applications of this method of wireless communication using light in the visible spectrum, also known as Visible Light Communication (VLC), are many. VLC has the inherent benefits of being unaffected by radio frequency devices and this will find applications in some factory and medical environments. LED stoplights or railroad signals can transmit information to cars or trains. There are applications for VLC even at home, such as data can be transmitted via ceiling lights to a receivers in appliances placed in a room. Siemens also states that this technology can benefit WLAN technology in certain ways.
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