Light amplifying optical fiber
CA 2348645 A1 · Owner: Aiso, Keiichi · Inventors: Aiso, Keiichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical fiber for optical amplifying capable of amplifying optical signals at least in the vicinity of wavelengths of 1.57 to 1.62 µm with a high gain in optical communication or the like. A clad (5) lower in refractive index than a core (1) is formed on the outer peripheral side of the erbium-added core (1), with the relative refractive index difference .DELTA. of the core (1) with respect to the clad (5) set to at least 0.3% and up to 1%. The core has a composition Er-Al2O3-GeO2-SiO2, and the clad has a composition SiO2 with erbium added to the entire region of the core at a concentration of 1000 wtppm and with the cutoff wavelength of the optical fiber set to 1400 nm. A …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed November 21, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 21, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 21, 2022.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.