Method and apparatus for writing a bragg grating in a waveguide
CA 2402535 A1 · Owner: Tormen, Maurizio · Inventors: Tormen, Maurizio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In order to create a diffraction grating in an optical fiber with a predetermined pattern of the refractive index an ultraviolet radiation beam , (3) is scanned (5 8) along a photosensitive portion (F') of the fiber through a phase mask (9) and, during the scan, the beam intensity (4) and the maskfiber distance (10) are controlled moment by moment in such a way as to obtain the desired patterns of the mean value and of the envelope of the refractive index, respectively.
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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 26, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 26, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 26, 2023.
- 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.