LI-FI PROMETE SUBSTITUIR WI-FI
Autor: Eletrotrafo | Publicado: 2013-04-12T12:17:00-07:00



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Pequeno e
barato



Aproveitar a iluminação das residências e
escritórios para transmitir dados é uma ideia antiga, mas que depende de
avanços na própria iluminação.




Isso porque a fonte ideal de luz para transmitir
dados são os LEDs, ainda não acessível à todos.



Um problema que poderá ser resolvido com o
desenvolvimento dos microLEDs, uma inovação anunciada por pesquisadores da
Universidade de Strathclyde, no Reino Unido.



Enquanto outros experimentos com transmissão de
dados por luz visível estão usando LEDs com dimensões na faixa de 1 milímetro
quadrado, a equipe do professor Martin Dawson conseguiu reduzi-los por um fator
de 1.000, criando LEDs com dimensões micrométricas.



MicroLEDs



Como são muito menores, os microLEDs podem piscar
1.000 vezes mais rapidamente do que os LEDs maiores, o que significa que eles
poderão transmitir os dados mais rapidamente.



Além disso, como 1.000 desses LEDs ocupam a mesma
área que um único LED tradicional, torna-se possível criar tantos canais de comunicação
independentes quantos sejam os microLEDs.



Em outras palavras, os microLEDs poderão transmitir
1.000 x 1.000 vezes – ou 1 milhão – mais informações do que os LEDs
tradicionais, ocupando a mesma área de 1 mm quadrado.



Os microLEDs são fabricados sobre pastilhas
semicondutoras comuns, constituindo um autêntico chip de luz, com a vantagem de
que cada LED é controlado individualmente.



Li-Fi



Os pesquisadores estão chamando suas novas redes
ópticas de redes Li-Fi, em substituição às redes Wi-Fi atuais – onde o Wi de
wireless (sem fios) é substituído pelo Li de Light (luz).



A técnica consiste em utilizar um aparelho, chamado
modulador, para fazer com que os LEDs pisquem rapidamente, transformando seus
estados ligado e desligado em 0s e 1s.



Isso não atrapalha a iluminação e não incomoda,
porque as piscadelas são rápidas demais para que o olho humano perceba.


Outra
possibilidade de uso dos microLEDs é na construção de grandes telas para
anúncios comerciais, onde cada LED se torna um pixel, criando outdoors
eletrônicos de resolução muito superior aos atuais.