Wavelength-flattened 2x2 splitter for single-mode optical waveguides
CA 2107778 C · Owner: Gonthier, Francois · Inventors: Ricard, Denis; Bures, Jacques; Gonthier, Francois
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The optical waveguide coupler device (1) is formed on two laterally adjacent optical fibers (4, 5) for splitting with wavelength-flattened ratios an incident light intensity (6) into the two fibers. Adjacent sections of the two fibers (4, 5) are fused together and first and second concatenated tapered portions are formed. These two tapered portions are separated by a central optical waveguide portion (10) including two parallel branches of slightly different lengths, each capable of propagating a light signal from either tapered portion to the other. The first and second tapered portions define optical waveguide couplers (2, 3) presenting coupling ratios varying with optical wavelength in …
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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 April 2, 1992 and granted November 20, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 2, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 2, 2014.
- 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.