Method and circuit for demultiplexing an optical signal
CA 2203729 C · Owner: Abe, Koichi · Inventors: Farries, Mark; Colbourne, Paul; Duck, Gary Stephen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A system and method are disclosed for demultiplexing closely spaced channels carrying, optically encoded data. A composite optical signal having data channels corresponding to, centre wavelengths .lambda.1 .lambda.2, .lambda.3, .lambda.4, ... .lambda.n are separated into two composite optical signals of first of which comprises data channels corresponding to centre wavelengths .lambda.1, .lambda.3, ... .lambda.n and a second which comprises data channels corresponding to centre wavelengths .lambda.2, .lambda.4, ... , .lambda.n-1 wherein adjacent channels centre wavelengths are separated from one another by a, distance "d". A periodic multi-cavity Fabry-Perôt etalon having a free …
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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 April 25, 1997 and granted April 17, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 25, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 25, 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
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.