Measurement of polarization dependent loss in an optical transmission system
CA 2399544 C · Owner: Jamal, Riyaz R. · Inventors: O'Sullivan, Maurice S.; Mcghan, Douglas D.; Jamal, Riyaz R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and system enables measurement of polarization dependent loss/gain (PDL) in an optical communications system including a plurality of cascaded optical components. An optical signal having a predetermined initial polarization state is launched into the optical communications system. A polarization state of the signal is detected at a selected detection point downstream of the launch point. The PDL is evaluated using the predetermined initial polarization state and the detected polarization state.
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 August 23, 2002 and granted February 21, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 23, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 23, 2024.
- 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.