Chromatic dispersion compensation
CA 2312463 A1 · Owner: Collar, Andrew J. · Inventors: Fells, Julian A.; Rourke, Howard N.; Collar, Andrew J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical waveguide provided with a linearly chirped Bragg reflective grating can be employed as a device that provides linear dispersion compensation. The amount of the linear dispersion thereby provided can be rendered adjustable by adjustment of the magnitude of axial strain imposed upon the grating. If the chirp is purely linear and if also, the strain is at all , times uniform along the length of the grating adjustment of the strain magnitude, will have no such effect. This requires the presence of a quadratic chirp term, but such a term introduces its own transmission penalty. This penalty is compensated at least in part by causing the light to make a reflection in a further Bragg …
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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 June 20, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 20, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 20, 2022.
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Timeline
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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.