OPTICAL WIRELESS NETWORKING : Illuminating the future of LANs
Daniel Rich ITEC 2320 OPTICAL WIRELESS NETWORKING BANDWIDTH : BANDWIDTH Every day the demand for more capacity grows AVAILABILITY : AVAILABILITY High speed throughput is limited by the “last mile” THE DIFFERENCE : THE DIFFERENCE FIBER OPTIC BACKBONE LOCAL LOOP Fiber has demonstrated speeds up to 100 Gbps Average download speed for the nation: 5.1 mbps WI-FI : WI-FI TODAY’S ANSWER Wi-Fi is the only real option for wireless connectivity in homes & small businesses.
The data transfer rates are less than needed, especially when multiple devices use the same connection.
Full multiplexing is not possible for Wi-Fi. WIRES : WIRES To avoid Wi-Fi bottlenecks, this is the alternative:
…and it’s not pretty A NEW SOLUTION : A NEW SOLUTION Replace radio waves with beams of light BREAKTHROUGH : BREAKTHROUGH Researchers discovered a way to encode infrared light with data in a way that dramatically improves transmission speed
The method delivers speeds more than 1 Gbps RADIO VS. INFRARED : RADIO VS. INFRARED Unlike radio waves used by Wi-Fi, light photons can deliver broader bandwidth that can be used simultaneously by multiple devices.
Also, photons do not interfere with each other or pass through walls like radio transmissions HOW IT WORKS : HOW IT WORKS The encoded infrared light is sent through a special holographic grid resulting in multiple beams all carrying the same data THE LIGHT GRID : THE LIGHT GRID The pencil-thin beams of infrared light fill the volume of a room, and devices fitted with infrared receivers pick up data from the beams anywhere within the array Beams reflect off of walls, desktops, even faces THE NEXT STEP : THE NEXT STEP WHITE LED Capable of even higher bandwidth, white LED lamps could replace infrared in future optical wireless systems.
White LEDs could light up rooms efficiently while simultaneously providing broadband wireless access. WHITE LED LIGHT : WHITE LED LIGHT Experts believe the cost of white LEDs will drop and they will become the standard light source for homes because of their energy efficiency.
based on them would
be easy to integrate
into existing fixtures MORE ADVANCEMENTS : = + MORE ADVANCEMENTS Combined with other proposed broadband solutions, optical wireless may soon bring amazing speeds REFERENCES : REFERENCES Network+ Guide to Networks
Scientific American: July 2007 issue