A rice-grain microcomb generates millimeter waves for 6G, lab bench required
Researchers at Loughborough University paired a tiny optical resonator with a fiber loop to output stable millimeter-wave frequencies, though shrinking the bench-scale rig into practical hardware remains a hurdle.
An international research team led by Loughborough University has demonstrated an optical microcomb system capable of generating precisely spaced light frequencies that convert directly into millimeter-wave electromagnetic signals, according to a paper published in Nature Communications.
Microcombs generate an array of distinct, evenly spaced optical frequencies, behaving somewhat like an invisible rainbow. In the setup tested at Loughborough, an on-chip optical microresonator roughly the size of a rice grain was coupled to a significantly longer optical fiber loop. Laser light circulates continuously through both segments, stabilizing the optical states required to generate the comb.
Because millimeter-wave spectrum provides substantial bandwidth, splitting signals across multiple tightly controlled frequencies could yield independent parallel channels for future 6G data transmission or timing references for quantum hardware. The researchers confirmed that individual comb lines could be strengthened or weakened independently, and that frequency stability survived the conversion from optical to millimeter waves.
The central trade-off is scale. While the silicon die is miniature, the complete experimental apparatus currently occupies an entire laboratory bench. The researchers aim to determine the system's ultimate precision limits and work toward packaging future iterations into an enclosure roughly the size of a shoebox.
Source: habr
Paper: Nature Communications
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