Switchable wavelength router
CA 2276275 C · Owner: Wu, Kuang-Yi · Inventors: Wu, Kuang-Yi; Liu, Jian-Yu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A switchable wavelength router (999) having an input port (11) for the incoming WDM signal (500) and two output ports (13 14) for de-multiplexing , the WDM signals (500). The router (999) divides the received optical signals into divided optical signals (101, 102) comprising a subset of the channels and spatially positions the divided optical signals in response to a control signal applied to the router (999). For example the router (999) can divide a , received WDM signal (500) into two subsets that are either single channel or WDM signals. Multiple routers (999) can be cascaded to form a 2n switchable wavelength router, where n is the number of stages of wavelength routers.
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 January 5, 1998 and granted August 6, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 5, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 5, 2020.
- 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.