Lightbulbs Could Replace Wi-Fi
Boston University's College of Engineering is launching a program to develop the next generation of wireless communications technology based on visible light instead of radio waves. Researchers expect to piggyback data communications capabilities on low-power light emitting diodes, or LEDs, to create "Smart Lighting" that would be faster and more secure than current network technology, reports cellular-news.com.
Said BU Engineering Professor Thomas Little: "This could be done with an LED-based communications network that also provides light - all over existing power lines with low power consumption, high reliability and no electromagnetic interference. Ultimately, the system is expected to be applicable from existing illumination devices, like swapping light bulbs for LEDs."
Boston University researches will focus on developing computer networking applications, notably the solid state optical technology that will form the network's backbone.
"This is a unique opportunity to create a transcendent technology that not only enables energy efficient lighting, but also creates the next generation of secure wireless communications," Little added. "As we switch from incandescent and compact florescent lighting to LEDs in the coming years, we can simultaneously build a faster and more secure communications infrastructure at a modest cost along with new and unexpected applications."
Little envisions indoor optical wireless communications systems that use white LED lighting within a room - akin to the television remote control device - to provide Internet connections to computers, personal digital assistants, television and radio reception, telephone connections and thermostat temperature control. The technology could also apply to WiFi enabled AV equipment.
With widespread LED lighting, a vast network of light-based communication is possible, Little noted. A wireless device within sight of an enabled LED could send and receive data though the air - initially at speeds in the 1 to 10 megabit per second range - with each LED serving as an access point to the network. Such a network would have the potential to offer users greater bandwidth than current RF technology.
Moreover, since this white light does not penetrate opaque surfaces such as walls, there is a higher level of security, as eavesdropping is not possible. LED lights also consume far less energy than RF technology, offering the opportunity to build a communication network without added energy costs and reducing carbon emissions over the long term.
The ability to rapidly turn LED lights on and off - so fast the change is imperceptible to the human eye - is key to the technology. Flickering light in patterns enables data transmission without any noticeable change in room lighting.