Regulating radiation component power in wavelength division multiplexed optical communication systems
CA 2438332 C · Owner: Ericsson Ab · Inventors: French, Graham Ronald; Fielding, John Richard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is provided a method of, and apparatus for regulating radiation , component , (wavelength channel) power in a wavelength division multiplexed (WDM) optical communications system. The system comprises a plurality of nodes interconnected , through optical waveguides (optical fibers). The method is characterised by: passing , one or more tokens around the system from node to node; adjusting nodal settings, such as optical attenuation, applied at each node to regulate the power of WDM radiation components at the node in response to receiving one or more tokens; and , repeating the method until WDM radiation component power within the system is substantially regulated.
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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 February 12, 2002 and granted May 1, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 12, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 12, 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
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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.