One of the key requirements of future optical communications technologies is a nanoscale light source capable of emitting ultrafast light pulses. In a new study, researchers have shown that graphene may be an ideal candidate for such a light source, by demonstrating graphene-based devices that emit light pulses with a bandwidth of up to 10 GHz and pulse durations of less than 100 picoseconds (or 10 billion pulses per second).

Via:: https://phys.org/news/2018-02-graphene-source-high-speed-pulses.html

Researchers demonstrate graphene as a source of high-speed light pulses

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