Researchers Test “DarkLight” Communication - Energy Watch News

Researchers Test “DarkLight” Communication

Researchers at Dartmouth have developed communication prototype that uses LEDs to transmit data. Unlike conventional Visual Light Communication, however, the LEDs emit light in pulses so quickly that that are invisible to the human eye. Hence, the researchers have dubbed the technology, “Dark Light” communication. They used off the shelf white LEDs in the prototype from Cree, Lumileds, Luminus Devices, and Honeywell. They proposed using very fast light pulses to transmit data at a rate that was so fast that it would be entirely imperceptible to humans. They found that with 500 ns pulses, the light was not perceptively different than the off mode of the luminaire. The researchers were able to efficiently generate and reliably detect ultra-short light pulses using off-the-shelf, low-cost LEDs and photodiodes.

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