Author Topic: Li-Fi - Data Transmission With Light & Solar Cells  (Read 1833 times)

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Offline EEVblog

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Li-Fi - Data Transmission With Light & Solar Cells
« on: December 02, 2015, 10:58:11 pm »
Sounds way too finicky to be practical for majority of uses.
And what about outdoors in ambient light? Would the sun swamp any other light source targeted at it?



« Last Edit: December 02, 2015, 10:59:54 pm by EEVblog »
 

Offline helius

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Re: Li-Fi - Data Transmission With Light & Solar Cells
« Reply #1 on: December 02, 2015, 11:56:22 pm »
Open-air laser data transmission has been commercialized since the 1990s. Safety regulations meant it had to be placed on elevated towers on roofs of commercial buildings where access can be controlled.

http://www.wired.com/2000/08/622-mbps-laser-tag/
https://en.wikipedia.org/wiki/Free-space_optical_communication
 

Offline Stonent

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Re: Li-Fi - Data Transmission With Light & Solar Cells
« Reply #2 on: December 03, 2015, 12:35:10 am »
Perhaps this is just the skeptic in me, but I looked at this from the standpoint of the video already being on the laptop and the lack of light just telling the laptop to pause and then restart when the light returns.

One reason being that the video stopped and did not get distorted and did not jump when the light returned.

If the stream was interrupted, there should be some blocking of data like when a satellite tv picture gets blocky when the signal is being interrupted partially.

If it was only waiting for complete frames, then the video should have jumped significantly when the light returned.
« Last Edit: December 03, 2015, 12:37:12 am by Stonent »
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Offline G7PSK

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Re: Li-Fi - Data Transmission With Light & Solar Cells
« Reply #3 on: December 03, 2015, 12:16:27 pm »
This is research going on in a Scottish university. The idea as I understood it was to modulate the led lighting in buildings and street lights so that information can be transferred. It is only what infra red remote's do but on a grander scale.
 


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