Researchers have demonstrated a microchip about the size of a grain of rice that can generate a highly organized “rainbow” of light. This development could eventually support faster, higher-capacity 6G networks and extremely precise timing for quantum technologies.
Physicists at Loughborough University, working with an international research team, developed a system that produces a series of precisely spaced optical frequencies.
These optical frequencies can then be converted into multiple high-frequency electromagnetic signals known as millimeter waves, a key component for telecom connectivity.
More Bandwidth for Future 6G Networks
Millimeter waves are attracting interest for future communications because they can provide considerably more bandwidth, giving networks more capacity to transmit data.
A major challenge has been generating these signals with the precision and stability required for advanced applications.
Dr. Luke Peters of Loughborough University’s Emergent Photonics Research Centre said the technology could eventually contribute to faster and higher-capacity 6G networks.
He added that the potential extends beyond communications to radar systems, spectroscopy and astronomical instruments, where extremely precise frequencies could help scientists study materials and measure the universe more accurately.
However, Peters stressed that these applications are still some way from practical deployment and that several challenges remain.
How the Microcomb Works
The system uses a technology known as a microcomb, which produces a highly precise set of light frequencies arranged somewhat like the colors of a rainbow, although the light itself is invisible to the human eye.
A specialized antenna can then convert those optical frequencies into millimeter waves.
Previous research showed that microcombs could generate a single precise millimeter-wave frequency.
The new system can produce multiple frequencies simultaneously, which could be much more useful, as each frequency could act as a separate channel for transmitting information.
Doing this requires the microcomb to maintain extremely high stability and signal quality.
The researchers reported in Nature Communications that their system can achieve that level of performance.
Researchers Now Want to Make It Practical
The system connects a chip-based microresonator to a much larger loop of optical fiber. Laser light continuously travels through both parts of the setup.
The research team is now investigating how the technology could move from a laboratory experiment toward practical real-world systems.
If those remaining challenges can be solved, the technology could eventually support future communications as well as applications in quantum systems, radar, spectroscopy, and astronomy.
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