-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ On Wednesday, June 23rd, 2021 at 3:41 AM, grarpamp <grarpamp@gmail.com> wrote:
On 6/23/21, Steven Schear schear.steve@gmail.com wrote:
The problem with IR laser comms is its only p2p, LoS
Cheap, works. Use whatever works.
But for moving bandwidth, digging or stringing fiber and copper, or mounting laser... seems hard to beat on cost X speed basis. Maybe source simple IR laser module kit from China if it's still too high at retail due to fancy targeted-to-business-user remarketing bullshit...
Aren't [the rest of] free space optics solutions still big $$$? ...
the big expense with FSO is compensating gimbal stabilizers for alignment - all the commercial offerings seem to consider this a requirement. as you say, cheap works - and you might be able to compensate manually with modern electronics. i still love the idea of FSO links in a p2p mesh network. AODV with multi-radio (FSO among wireless in this case) benefits from asymmetric links and capacities.
Is this UV / freespace tech at consumer production and price level, links?
would be great to see a crowd funded effort! the pureLiFi device looks interesting, but proprietary :/ [ https://purelifi.com/lifi-products-2/ ] there are some research works on FSO for VR headsets, and such an open source effort might be adapted to long range. here's an interesting system using fiber optics on each end to achieve higher throughput: """ “In urban [settings], due to the influence of factories, automobile exhaust, and other factors, there are more particles, molecules, dust, and so on in the atmospheric channel than in other places, such as mountains,” said Zhan. “These factors lead to serious attenuation of optical signals, resulting in very low received power.” The group used standard single-mode optical fibers on the transmitter side of the system to launch 16 ultrahigh-definition video streams as free-space optical signals. The key upgrade they made to the system for it to work was at the receiver, where they used an OM4 multimode fiber rather than single-mode fiber, resulting in a 10-decibel improvement to the signal coupling efficiency. Video transmission with few errors was demonstrated in different parts of the day, different seasons, and different weather conditions. The test range was limited to 2.1 kilometers because of obstructions in the high-density urban setting. From the high power margin in the 2.1 km link demonstration, the researchers expect to be able to easily extend this distance. """ - - https://www.ofcconference.org/en-us/home/news-and-press/press-releases/impro... i am having trouble finding more detail on this system, -----BEGIN PGP SIGNATURE----- iNUEAREKAH0WIQRBwSuMMH1+IZiqV4FlqEfnwrk4DAUCYOYOjl8UgAAAAAAuAChp c3N1ZXItZnByQG5vdGF0aW9ucy5vcGVucGdwLmZpZnRoaG9yc2VtYW4ubmV0NDFD MTJCOEMzMDdEN0UyMTk4QUE1NzgxNjVBODQ3RTdDMkI5MzgwQwAKCRBlqEfnwrk4 DGnCAPwPSWqGbK1LEJXcydBNJ55mmTylnVP06Laij4ahIUfWDAD+I/U4F1O9zBUA pqIsHP3J9ouBMHHkHA14Pf+8jgFJCUA= =8hjw -----END PGP SIGNATURE-----