200-280 GHz ‘Millilink’ Sets Wireless Data Transmission Record

Researchers at the Fraunhofer Institute for Applied Solid State Physics and the Karlsruhe Institute for Technology have transmitted a 40 Gbps data stream at 240 GHz across a distance of one kilometer, achieving what is said to be a world record in this portion of the spectrum.

The Fraunhofer press release, New World Record in Wireless Data Transmission says “Their most recent demonstration sets a new world record and ties in seamlessly with the capacity of optical fiber transmission. In the future, such radio links will be able to close gaps in providing broadband internet by supplementing the network in rural areas and places which are difficult to access.”

Project Millilink used fully integrated electronic transceivers set up on two skyscrapers.

“We have managed to develop a radio link based on active electronic circuits, which enables similarly high data rates as in fiber-optic systems, therefore allowing seamless integration of the radio link,” said Professor Ingmar Kalifass, coordinator of the project at Fraunhofer IAF. “The device uses 80 GHz of spectrum between 200 and 280 GHz. The atmosphere has less attenuation at this frequency.

Jochen Antes of KIT noted that: “This makes our radio link easier to install compared to free-space optical systems for data transmission. It also shows better robustness in poor weather conditions such as fog or rain.” There is room for improvement. Antes added, “Improving the spectral efficiency by using more complex modulation formats or a combination of several channels, i.e. multiplexing, will help to achieve even higher data rates.”

This technology could be ideal for providing the last kilometer connection for “fiber to the home” services, especially in rural areas where it could be a cost-effective and flexible alternative to fiber.

Doug Lung

Doug Lung is one of America's foremost authorities on broadcast RF technology. As vice president of Broadcast Technology for NBCUniversal Local, H. Douglas Lung leads NBC and Telemundo-owned stations’ RF and transmission affairs, including microwave, radars, satellite uplinks, and FCC technical filings. Beginning his career in 1976 at KSCI in Los Angeles, Lung has nearly 50 years of experience in broadcast television engineering. Beginning in 1985, he led the engineering department for what was to become the Telemundo network and station group, assisting in the design, construction and installation of the company’s broadcast and cable facilities. Other projects include work on the launch of Hawaii’s first UHF TV station, the rollout and testing of the ATSC mobile-handheld standard, and software development related to the incentive auction TV spectrum repack. A longtime columnist for TV Technology, Doug is also a regular contributor to IEEE Broadcast Technology. He is the recipient of the 2023 NAB Television Engineering Award. He also received a Tech Leadership Award from TV Tech publisher Future plc in 2021 and is a member of the IEEE Broadcast Technology Society and the Society of Broadcast Engineers.