Large effective area fiber having a low total dispersion slope
CA 2371087 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
Disclosed is a single mode optical waveguide fiber having a relatively large effective area and good bend resistance. The waveguide fiber is characterized by a segmented core having a central segment (30) and at least one annular segment (32, 34, 36) surrounding the central segment. At least one segment has a negative relative refractive index where the reference refractive index is taken as the index of the cladding. The total dispersion of the fiber is positive for wavelengths above about 1500 nm dispersion slope is typically , less than about 0.08 ps/nm2-km and induced attenuation under pin array bend testing is typically less than 5 dB/km.
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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 March 23, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 23, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 23, 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.