In a potentially promising development, researchers from Osaka University and IMRA America have unveiled a single-channel optical wireless link that can reach speeds of up to 240 GB/s, a new world record. The team now aims to quadruple this performance to reach an unprecedented speed of 1 TB/s.
eeNews Europe reports that researchers used a stimulated Brillouin scattering laser to generate signals at 300 GHz for 6G networks. This laser uses interactions between light and sound waves to produce a precise signal.
The team then established a wireless communication system in the 300 GHz band that uses this laser-based signal generator in both the transmitter and receiver.
The highest transmission rate in the world.
The subterahertz band, which runs from 100 GHz to 300 GHz, is the playing field for these 6G transmitters and receivers. To further increase the data transmission speed of these wireless links, the researchers used a sophisticated approach called “multilevel signal modulation.” However, this method becomes very sensitive to noise when operating at the upper end of these frequencies.
For efficient operation, multi-level signal modulation relies on precise reference signals. When these signals begin to change, phase noise negatively affects the modulation performance of the multilevel signal. To counter this, the system uses online digital signal processing (DSP) to demodulate the signals at the receiver and increase the data rate.
Tadao Nagatsuma, project leader, proudly announced: “Our team achieved a single-channel transmission speed of 240 GB/s. This is the highest transmission speed achieved so far in the world using online DSP.”
Researchers are optimistic that with the use of multiplexing techniques, which allow more than one channel to be used, and more sensitive receivers, they can increase data rates to 1 TB/s, setting the stage for the next generation of 6G mobile networks. . .
