GREAT JOB Jim - $$$$$$$$$$$$$$$$$$$$$$$ -------- Original Message -------- On Sep 12, 2019, 9:47 AM, jim bell wrote:
> Jim Bell meets Sumitomo Electric at Seattle. > > I am driving to Seattle today to meet executives from Sumitomo Electric. > https://global-sei.com/ They are one of the major manufacturers of > optical waveguides. (fiber optics). > https://global-sei.com/products/optical-fiber/ > > Sumitomo Electric has the distinction of having achieved the world record for > optical waveguide loss, currently about 0.1419 dB/kilometer at 1560 > nanometers. (This is apparently a laboratory result, not production.) > https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=8267035 > > It beats one of its biggest competitors, Corning > https://www.corning.com/worldwide/en/products/communication-networks/products/fiber/optical-fiber-resource-center/fiber-matters-videos-and-tutorials.html > primarily because Sumitomo employs a pure-silica fiber core, with a > fluorine-doped cladding, whereas Corning has long employed a pure-silica > cladding, with the core doped with germanium. One of Sumitomo's fibers, > Z+150 has a production loss of 0.152 dB/km > > One of Corning's fibers, has a specified loss of less than 0.17 dB/km at > 1550 nanometers wavelength. (A production result, not laboratory.) > > Into this 30 year+ competition I come, like a veritable bull in the technical > china-shop. I got the attention of Sumitomo by using LinkedIn to send about > 100 of their employees on Monday (as well as a couple thousand others at > Corning, YOFC, OFS, Prysmian, ZTT, Hengtong, Nokia, Fujikura, Furukawa, > Futong, Fiberhome, Ciena, Huawei Marine, and SubCom) a statement: > > "Your company should be selling a silica single-mode optical waveguide with a > loss of 0.001 dB/kilometer. You'll think that's impossible but I know how to > do it. > https://www.linkedin.com/pulse/optical-waveguide-0001-dbkm-loss-even-10x-less-jim-bellhttps://daltonium.com/optical-fiber/ > > (What I have not yet mentioned is my belief that rather than the usual > silica-fiber transmission "sweet spot" being about 1500-1600 nanometers, > useful transmission will likely occur from 600-2000+ nanometer wavelength. > This will keep fiber transmitter and receiver manufacturers busy for years!) > > Well, THAT got Sumitomo's attention !!! What I proposed amounted to, in > their industry, a leprechaun saddled on a unicorn, itself standing on the > back of a winged-pig. Flying. > > Jim Bell
