Large effective area single mode optical waveguide
CA 2246445 A1 · Owner: Corning Incorporated · Inventors: Liu, Yanming
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A single mode optical waveguide fiber having a core refractive index profile of at least four segments (26, 28, 30, 36 38, 40, 42) is disclosed. The main , features of the core design are at least two non-adjacent core profile segments (26, 30, 36, 40) have positive .DELTA. %; are at least two non-, adjacent segments (28 32, 38, 42) have negative .DELTA. %. The novel waveguide core design provides a single mode waveguide which is suitable for high rate, long regenerator spacing systems which incorporate optical amplifiers. The waveguide core structure also lends itself to the manufacture of dispersion managed waveguide fiber.
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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 February 19, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 19, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 19, 2019.
- 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.