Diffraction grating with reduced polarization sensitivity
CA 2230580 A1 · Owner: Chowdhury, Dipakbin Q. · Inventors: Chowdhury, Dipakbin Q.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A multiplexer/demultiplexer (10) for routing different wavelength signals between a common pathway (12) for conveying a plurality of the signals and , individual pathways (14a-14b) for separately conveying the signals includes a , reflective diffraction grating (16) with reduced polarization sensitivity for dispersing the signals. The grating (16) includes facets (20) that are oriented for reducing efficiency variations within a transmission bandwidth and that are shaped for reducing differences between the diffraction efficiencies in two orthogonal directions of polarization.
Read the whole patent
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 27, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 27, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 27, 2019.
- 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.