Methods and Apparatus for Communication Using UV Light
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United States of America Patent
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Issued Date -
May 3, 2007
app pub date -
Sep 20, 2006
filing date -
Jul 19, 2002
priority date (Note) -
Abandoned
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Abstract
Communication methods and apparatus using ultraviolet (UV) light are provided. Save UV communication devices, including remote control units, can use highly efficient UV LEDs and very low-noise UV photodetectors. In some cases, the LEDs emit light at wavelengths below 400 nm, below 320 nm, or even below 280 nm. In one embodiment, communication can be achieved using an LED that emits less than about 1 picowatt of UV energy at a photodetector distance of up to at least about 10 meters. Longer range communication can also be achieved at higher power levels. Photodetectors having very low dark currents at room temperature, such as below about 1.times.10.sup.-9 A/m.sup.2, are preferable.
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