Optical dispersion compensation
CA 2248477 C · Owner: Moeller, Lothar Benedict Erhard Josef · Inventors: Moeller, Lothar Benedict Erhard Josef
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates generally to the field of optical communications and particularly to optical communication techniques which compensate for dispersionsuch as that in optical fibers. Compensation of optical dispersion is achieved with a polarisation beam splitter with first, second and third ports, a dispersion compensation fiber a first return means, that changes the mode of polarisation of a returned signal and a second return means. One end of the dispersion compensation means is connected to the third port of the polarisation beam splitter the other end is connected to the first return means. The second return means is connected with the second port of the polarisation beam …
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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 September 28, 1998 and granted May 13, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 28, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 28, 2020.
- 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.