100 Gigabits A Second: World Record Wireless Data Transmission Set

Photo: KIT Extension of cable-based telecommunication networks requires high investments in both conurbations and rural areas. Broadband data transmission via radio relay links might help to cross rivers, motorways or nature protection areas at strategic node points, and to make network extension economically feasible. In the current issue of the nature photonics magazine, researchers present a method for wireless data transmission at a world-record rate of 100 gigabits per second. (doi: 10.1038/nphoton.2013.275) In their record experiment, 100 gigabits of data per second were transmitted at a frequency of 237.5 GHz over a distance of 20 m in the laboratory. In previous field experiments under the “Millilink” project funded by the BMBF, rates of 40 gigabits per second and transmission distances of more than 1 km were reached. For their latest world record, the scientists applied a photonic method to generate the radio signals at the transmitter. After radio transmission, fully integrated electronic circuits were used in the receiver. Setup for the world record of wireless data transmission at 100 gigabits per second: The receiver unit (left) Photo: KI receives the radio signal that is recorded by the oscilloscope (right).  “Our project focused on integration of a broadband radio relay link into fiber-optical...

Read More........→October 16, 2013

Radio signals from a distant galaxy find their way to Earth

An artist’s animation of galaxy with jets from a supermassive black hole. © NASA/ESA/STSc Indian astrophysicists have discovered relic radio signals that are emanating from the edge of a distant low-mass galaxy cluster named Abell 16971. Stemming from a merger of two galaxy clusters, such radio signals provide a unique opportunity to study matter and galaxy cluster physics that cannot be explored in laboratories.  Since the Big Bang, galaxy cluster mergers are the most energetic events in the universe. Behaving like particle accelerators, such mergers release tremendous energy and accelerate electrons close to the speed of light, eventually generating tsunami-like shock waves. These waves then reach the edge of clusters and emit relic radio signals. Relics are common in massive merging clusters. But only a few relics have been detected in low-mass clusters.  While scanning the Northern Sky with the LOFAR Two-metre Sky Survey (LoTSS), an array of radio telescopes, the scientists from the Savitribai Phule Pune University and the National centre for radio Astrophysics of Tata Institute of Fundamental Research, both in Pune, India, accidentally discovered Abell 1697. They observed that the cluster is moving away from us. The cluster is home to 84 galaxies.  Radio and optical images reveal...

Read More........→July 12, 2020