Using gain tilt for local compensation of unwanted power gradients
CA 2433486 C · Owner: Nortel Networks Limited · Inventors: Peeters, Bram; Bragg, Nigel L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A compensator for optical transmission systems exploits gain tilt inherent in optical , amplifiers. The amount of SRS induced spectral power gradient is determined and , the amplifier gain is changed to cause a compensating gain gradient in the optical , amplifier to compensate for the SRS induced spectral power gradient. Fewer components are needed, and so it can be less expensive. It can be implemented as , a simple software upgrade to existing systems. Many such compensators can be distributed through the system, without requiring a large inventory of individually , specified filters. More accurate compensation can be achieved by making it dependent on the distribution of …
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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 June 25, 2003 and granted November 13, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 25, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 25, 2025.
- 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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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.