Add/drop node for an optical communications network
CA 2475858 A1 · Owner: Ericsson Ab · Inventors: Claringburn, Harry Richard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A 1550nm DWDM optical communications network has a 1300nm remote node added to which a small number of channels can be added or dropped. The additional node includes dual wavelength couplers to enable 1300nm wavelength signals to be added or dropped. The 1300nm signals are demultiplexed using a WDM filter and connected into the transponders of the 1550nm nodes for transportation around the node. Signals for the remote network are converted to 1300nm signals at the 1550nm node transponders and multiplexed onto the network to be dropped to the network node transponder.
Read the whole patent
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 March 14, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 14, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 14, 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
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.