Bidirectional dispersion compensation system
CA 2333412 A1 · Owner: Mci Worldcom, Inc. · Inventors: Robinson, Andrew Niall
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A bidirectional chromatic dispersion system includes an optical circulator that includes four ports (33). A first port (35) is coupled to a first optical transmission medium (43) and a third port (39) is coupled to the second transmission medium (45). A first dispersion compensating grating (49) which reflects wavelengths in a first optical band is coupled to the second port through a dispersion compensating fiber and a second dispersion compensating , grating (47) which reflects wavelengths in a second optical band is coupled to the forth port through a dispersion compensating fiber. The first dispersion compensating grating is substantially transparent to wavelengths in the second …
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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 May 13, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 13, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 13, 2021.
- 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.