Optical fiber with large effective area and low dispersion slope for submarine applications
CA 2382976 A1 · Owner: Li, Ming-Jun · Inventors: Li, Ming-Jun
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 relatively large effective area, a negative total dispersion at 1560 nm and a low dispersion slope has a segmented core having a central segment (10) a first annular segment (12), a , second annular segment (14) and a third annular segment (16). Each segment has a relative refractive index percent, and an inner and outer radius. The relative refractive index percent and the radii of each core segment are chosen from the following ranges: the relative index of the central segment within the range of about 0.4 % to about 0.9 %; the relative index of the first annular segment within the range of about -0.2 % to about 0.1%; the relative …
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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 August 25, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 25, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 25, 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.