KEYWORDS: Deep ultraviolet, Light emitting diodes, Wireless communications, Signal to noise ratio, Sun, Signal attenuation, Lighting standards, Light sources and illumination, Interference (communication), Epitaxy
Since the intensity of deep ultraviolet (DUV) light with the wavelength below 300 nm is nearly zero in the sun spectrum, optical wireless communications (OWC) based on DUV light can have a unique “zero-background” characteristics. We recently demonstrated LED-based DUV OWC at 280-nm band over a 1.5-m direct line-of-site channel realizing the effective data rate of as fast as >2 Gbps under standard room lighting and >1 Gbps under direct sun with outdoor experiments. These experiments were performed off-the-shell DUV AlGaN light-emitting diodes, which was grown by metalorganic vapor-phase epitaxy using an AlN/sapphire template with dense macrosteps.
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