Hi Ed, hope you are doing well.
You may be thinking of IrDA which was popular on PDAs at the time - https://en.wikipedia.org/wiki/Infrared_Data_Association. This didn't use different wavelengths for TX and RX (as I erroneously remembered) but instead it is half duplex and shares the time between the TX and RX. All the best James From: Edward Price [mailto:[email protected]] Sent: 11 December 2017 18:44 To: [email protected] Subject: Re: [PSES] Li-Fi I seem to recall HP was touting some kind of optical link system back in the 90's. (IIRC, it was omni-directional infrared.) I think they were suggesting it for sharing of a printer within a multi-computer office, or for linking test equipment into a lab's mini-computer. While I can see some uses where a modulated light source, powerful yet inexpensive, would be a good data link, I can also see a few problems, the first of which is bi-directionality and the second is data capacity ahead of the optical links. As for his hints of vehicular applications, we still haven't eliminated rain, smoke and fog. Call me cynical, but whenever somebody puts a box on stage and does magic engineering, I become skeptical. Whaddya mean, you don't want to get into the details? Altogether, Li-Fi is yet another path. Ubiquitous LED's make it more attractive, but not quite a standing ovation quality concept. Ed Price WB6WSN Chula Vista, CA USA -----Original Message----- From: Ralph McDiarmid [mailto:[email protected]] Sent: Monday, December 11, 2017 8:21 AM To: [email protected] <mailto:[email protected]> Subject: Re: [PSES] Li-Fi 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:[email protected]> mailto:[email protected]] Sent: Monday, December 11, 2017 12:51 AM To: <mailto:[email protected]> [email protected] Subject: [PSES] Li-Fi I came over this video .... <https://www.ted.com/talks/harald_haas_a_breakthrough_new_kind_of_wireless_i nternet#t-432451> https://www.ted.com/talks/harald_haas_a_breakthrough_new_kind_of_wireless_in ternet#t-432451 Anyone who have studied this tech? Cheers, Amund - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected] <mailto:[email protected]> > All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) <http://www.ieee-pses.org/list.html> List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected] <mailto:[email protected]> > Mike Cantwell <[email protected] <mailto:[email protected]> > For policy questions, send mail to: Jim Bacher <[email protected] <mailto:[email protected]> > David Heald <[email protected] <mailto:[email protected]> > - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
