Nature, Published online: 18 February 2026; doi:10.1038/d41586-026-00484-1

Optical-amplifier devices that boost light signals are workhorses of modern technology, but shrinking them onto microchips requires impractically high power. An amplifier architecture has been developed that recycles its own ‘pump’ energy to achieve high performance at power levels ten times lower than those of previous designs, making low-power, chip-scale optical amplification practical.

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