Why would you want to use visible light? Our radiocommunications have an infrastructure built on the principle that interference is to be limited. Even on the ISM bands, there are rules that are supposed to allow the operation of devices without undue interference. We aren't going to start regulating visible light sources to allow Li-Fi to work.
The video also shows a very short range demonstration where the speaker can easily control the signal to noise ratio. Brighter ambient light would be a problem. The speaker gives the example of using streetlights for Li-Fi. I can't imagine this working well on a sunny day. We also know how current wireless technologies work. As you increase the frequency, you can increase the data rate. However, you generally reduce the range and you become more subject to light of sight limitations. Visible light takes this to the extreme. I generally discount TED talks. My personal opinion is that there is some amount of snake oil being sold in TED talks. Ted Eckert Microsoft Corporation The opinions expressed are my own and do not necessarily reflect those of my employer, TED LLC, or anybody else named Ted. From: John Woodgate [mailto:j...@woodjohn.uk] Sent: Monday, December 11, 2017 8:41 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Li-Fi LED light can indeed be modulated very quickly. Isn't that how fibre-optic cable works? John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk<https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.woodjohn.uk&data=04%7C01%7Cted.eckert%40microsoft.com%7C4d0b39f6f9484d19a7ba08d540b61122%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636486073080275097%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwifQ%3D%3D%7C-1&sdata=UT9HDfAs%2FAebKPJFZucCbSSodrKzY9psZ4v2if%2FuWoU%3D&reserved=0> Rayleigh, Essex UK On 2017-12-11 16:20, Ralph McDiarmid wrote: I haven't studied it, but seems to me that one would need to modulate the light very quickly to get any sort of usable BAUD rate, unless you settle for transmission of text only. (like the good old Bell 202 modems over voice band land lines) Ralph McDiarmid Product Compliance Engineering Solar Business Schneider Electric -----Original Message----- From: Amund Westin [mailto:am...@westin-emission.no] Sent: Monday, December 11, 2017 12:51 AM To: EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG> Subject: [PSES] Li-Fi I came over this video .... https://www.ted.com/talks/harald_haas_a_breakthrough_new_kind_of_wireless_internet#t-432451<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ted.com%2Ftalks%2Fharald_haas_a_breakthrough_new_kind_of_wireless_internet%23t-432451&data=04%7C01%7Cted.eckert%40microsoft.com%7C4d0b39f6f9484d19a7ba08d540b61122%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636486073080275097%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwifQ%3D%3D%7C-1&sdata=WGrkxJCV%2FDatgwud6JxgxKCUYaZWockEpMDDlA%2BpQm8%3D&reserved=0> Anyone who have studied this tech? Cheers, Amund - ---------------------------------------------------------------- - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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