Researchers from Osaka University and IMRA America recently had a breakthrough after they were able to achieve a world-record speed of 240Gb/s for a single-channel optical wireless link. Now, the duo are eyeing to achieve speeds of up to 1Tb/s.
The researchers achieved this by using a stimulated Brillouin scattering laser to help achieve signals at 300GHz for 6G networks. The said laser uses interactions between sound and light waves to create a precise signal.
They then created a 300GHz-based wireless communication system that uses the said laser-based signal generator in both the receiver and the transmitter.
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Sub-terahertz bands that range from 100GHz to 300GHz are the playground for such 6G transmitters and receivers. To further increase the data transfers of these wireless links, the researchers used a special approach called “multi-level signal modulation.”
Albeit, this method comes with a caveat, as it is very sensitive to noise when working at the top end of these frequencies. So, to run efficiently, multi-level signal modulation has to rely on precise reference signals. They have implemented an online digital signal processing (DSP) to demodulate signals when phase noise negatively impacts the performance of the multi-level signal modulation, which will then increase the data transfer rates.
The researchers said that they are positive they can push data rates to 1TB/s with the help of multiplexing techniques that allow them to use more than one channel.
Via: Techradar