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• Digg Promotes Cassandra
• Apple Testing RFID for iPhone ?
• Why MySQL Must Go

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LED Datalinks

by Andrew McCaskey
Flooding the the room with light and data at the same time has a lot going for it – and that’s the promise of some new work that is being done at MIT.

LED’s are the only visible light source that can be keyed on and off rapidly enough to handle data at rates approaching 250Mb/sec. – and with spectral filtering, those sorts of speeds have been reached during trials.

From the articles, it looks like this is still a simple on-off keying at extremely rapid rates. It’s going to get really interesting when more sophisticated signalling gets incorporated, with the equivalent of frequency shift keying between light frequencies , resulting in a mix of colors that our eyes would interpret as white light, but would in fact be a spread spectrum signalling scheme.

Now that would be a real way to send a message to oncoming cars.

Although visual short range digital signalling to other drivers has already been perfected. Probably for the past hundred years or so.

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