CEA-Leti announces a throughput world record 5.1 to 7.7 Gbps in VLC using a single GaN blue micro- light-emitting diode (LED)

CEA-Leti Announcement

A few weeks ago, CEA-Leti, a Grenoble, France-based research institute for electronics and information technologies and one of the world's largest organizations for applied research in microelectronics and nanotechnology, made the announcement of the throughput world record of 5.1 Gbps in visible light communications (VLC) using a single GaN blue micro- light-emitting diode (LED).

Their data transmission rate of 7.7 Gbps achieved with a 10 µm microLED marks another step toward commercialisation and widespread use of LiFi communication.

Benoit Miscopein, a CEA-Leti research scientist, stated that Li Fi technology has exciting potential for mass-market applications. He further stated: "Multi-LED systems could replace WiFi, but wide-scale adoption will require a standardization process to ensure the systems' interoperability between different manufacturers. The Light Communications Alliance was created in 2019 to encourage the industry to implement this standardization.

CEA-Leti said that: “In addition to a stand-alone WiFi-like standard, the possibility to include this new technology as a component carrier in the downlink of 5G-NR, a radio-access technology for 5G mobile considerations, is also under investigation to bring a large additional license-free bandwidth. This may be feasible because CEA-Leti's LiFi physical layer relies on the same concepts as WiFi and 5G technologies," said Miscopein. "Matrices of thousands of microLEDs could also open the way to mid- to long-range applications, such as indoor wireless multiple access.”

To preserve the bandwidth of each microLED within a matrix, it requires that each signal is generated as close as possible to the micro-optical source. CEA-Leti said: o meet this challenge, we expect to hybridise the microLED matrix onto another matrix of CMOS drivers: one simple CMOS driver will pilot one microLED," Miscopein said. "This will also enable the additional feature of piloting each microLED pixel independently, and that allows new types of digital-to-optical waveforms that could eliminate the need for digital-to-analog converters commonly used in the conventional 'analogue' implementations of LiFi.

Source: http://www.leti-cea.com/cea-tech/leti/english/Pages/What%27s-On/Press%20release/CEA-Leti-Researchers-Break-Throughput-Record-for-LiFi-Communications-Using-Single-GaN-Blue-Micro-Light-Emitting-Diode.aspx

What is Li Fi?

Li-Fi, also known as "Light Fidelity" is a wireless optical networking technology, which uses light-emitting diodes (LEDs) to transmit data. In 2011, professor Harald Haas made a Li-Fi demonstration at the TED (Technology, Entertainment, Design) Global Talk on Visible Light Communication (VLC). Below is a video demonstration of Li-Fi technology by professor Harald Haas:

VLC uses light as a medium to deliver high-speed communication like Wi-Fi and complies with the IEEE standard IEEE 802.15.7. The IEEE 802.15.7 is a high-speed, bidirectional, and fully networked wireless communication technology-based standard similar to Wi-Fi's IEEE 802.11.

How does Li-Fi work?

Li-Fi is a high speed, bidirectional, and fully networked wireless communication of data using light. Li-Fi constitutes of several light bulbs that form a wireless network.

When an electrical current goes through to a LED light bulb, a stream of light (photons) emits from the lamp. LED bulbs are semiconductor devices, which means that the brightness of the light flowing through them can change at extremely high speeds. The signal is sent by modulating the light at different rates. The signal can then be received by a detector which interprets the changes in light intensity (the signal) as data. Also when the LED is ON, you transmit a digital 1, and when it is OFF, you transmit a 0.

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