Wi-​fi on rays of light

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Slow wi-​fi is a source of irri­ta­tion that nearly every­one expe­ri­ences. Wire­less devices in the home con­sume ever more data, and it’s only grow­ing, and con­gest­ing the wi-​fi net­work. Researchers at Eind­hoven Uni­ver­sity of Tech­nol­ogy have come up with a sur­pris­ing solu­tion: a wire­less net­work based on harm­less infrared rays. The capac­ity is not only huge (more than 40Gbit/​s per ray) but also there is no need to share since every device gets its own ray of light. This was the sub­ject for which TU/​e researcher Joanne Oh received her PhD degree with the ‘cum laude’ dis­tinc­tion last week.

The sys­tem con­ceived in Eind­hoven is sim­ple and, in prin­ci­ple, cheap to set up. The wire­less data comes from a few cen­tral ‘light anten­nas’, for instance mounted on the ceil­ing, which are able to very pre­cisely direct the rays of light sup­plied by an opti­cal fiber. Since there are no mov­ing parts, it is maintenance-​free and needs no power: the anten­nas con­tain a pair of grat­ings that radi­ate light rays of dif­fer­ent wave­lengths at dif­fer­ent angles (‘pas­sive dif­frac­tion grat­ings’). Chang­ing the light wave­lengths also changes the direc­tion of the ray of light. Since a safe infrared wave­length is used that does not reach the vul­ner­a­ble retina in your eye, this tech­nique is harmless.


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Slow wi-​fi is a source of irri­ta­tion that nearly every­one expe­ri­ences. Wire­less devices in the home con­sume ever more data, and it’s only grow­ing, and con­gest­ing the wi-​fi net­work. Researchers at Eind­hoven Uni­ver­sity of Tech­nol­ogy have come up with a sur­pris­ing solu­tion: a wire­less net­work based on harm­less infrared rays. The capac­ity is not only huge (more than 40Gbit/​s per ray) but also there is no need to share since every device gets its own ray of light. This was the sub­ject for which TU/​e researcher Joanne Oh received her PhD degree with the ‘cum laude’ dis­tinc­tion last week.

The sys­tem con­ceived in Eind­hoven is sim­ple and, in prin­ci­ple, cheap to set up. The wire­less data comes from a few cen­tral ‘light anten­nas’, for instance mounted on the ceil­ing, which are able to very pre­cisely direct the rays of light sup­plied by an opti­cal fiber. Since there are no mov­ing parts, it is maintenance-​free and needs no power: the anten­nas con­tain a pair of grat­ings that radi­ate light rays of dif­fer­ent wave­lengths at dif­fer­ent angles (‘pas­sive dif­frac­tion grat­ings’). Chang­ing the light wave­lengths also changes the direc­tion of the ray of light. Since a safe infrared wave­length is used that does not reach the vul­ner­a­ble retina in your eye, this tech­nique is harmless.



Read more at: https://​phys​.org/​n​e​w​s​/​201703-wi-fi-rays-light100-faster-overloaded.html#jCp

Slow wi-​fi is a source of irri­ta­tion that nearly every­one expe­ri­ences. Wire­less devices in the home con­sume ever more data, and it’s only grow­ing, and con­gest­ing the wi-​fi net­work. Researchers at Eind­hoven Uni­ver­sity of Tech­nol­ogy have come up with a sur­pris­ing solu­tion: a wire­less net­work based on harm­less infrared rays. The capac­ity is not only huge (more than 40Gbit/​s per ray) but also there is no need to share since every device gets its own ray of light. This was the sub­ject for which TU/​e researcher Joanne Oh received her PhD degree with the ‘cum laude’ dis­tinc­tion last week.

The sys­tem con­ceived in Eind­hoven is sim­ple and, in prin­ci­ple, cheap to set up. The wire­less data comes from a few cen­tral ‘light anten­nas’, for instance mounted on the ceil­ing, which are able to very pre­cisely direct the rays of light sup­plied by an opti­cal fiber. Since there are no mov­ing parts, it is maintenance-​free and needs no power: the anten­nas con­tain a pair of grat­ings that radi­ate light rays of dif­fer­ent wave­lengths at dif­fer­ent angles (‘pas­sive dif­frac­tion grat­ings’). Chang­ing the light wave­lengths also changes the direc­tion of the ray of light. Since a safe infrared wave­length is used that does not reach the vul­ner­a­ble retina in your eye, this tech­nique is harmless.



Read more at: https://​phys​.org/​n​e​w​s​/​201703-wi-fi-rays-light100-faster-overloaded.html#

Slow wi-​fi is a source of irri­ta­tion that nearly every­one expe­ri­ences. Wire­less devices in the home con­sume ever more data, and it’s only grow­ing, and con­gest­ing the wi-​fi net­work. Researchers at Eind­hoven Uni­ver­sity of Tech­nol­ogy have come up with a sur­pris­ing solu­tion: a wire­less net­work based on harm­less infrared rays. The capac­ity is not only huge (more than 40Gbit/​s per ray) but also there is no need to share since every device gets its own ray of light. This was the sub­ject for which TU/​e researcher Joanne Oh received her PhD degree with the ‘cum laude’ dis­tinc­tion last week.

The sys­tem con­ceived in Eind­hoven is sim­ple and, in prin­ci­ple, cheap to set up. The wire­less data comes from a few cen­tral ‘light anten­nas’, for instance mounted on the ceil­ing, which are able to very pre­cisely direct the rays of light sup­plied by an opti­cal fiber. Since there are no mov­ing parts, it is maintenance-​free and needs no power: the anten­nas con­tain a pair of grat­ings that radi­ate light rays of dif­fer­ent wave­lengths at dif­fer­ent angles (‘pas­sive dif­frac­tion grat­ings’). Chang­ing the light wave­lengths also changes the direc­tion of the ray of light. Since a safe infrared wave­length is used that does not reach the vul­ner­a­ble retina in your eye, this tech­nique is harmless.



Read more at: https://​phys​.org/​n​e​w​s​/​201703-wi-fi-rays-light100-faster-overloaded.html#jCp
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