Optical switching device having recirculating structure and optical switching method therefor
CA 2229683 C · Owner: Kang, Woo-Shik · Inventors: Kang, Woo-Shik; Zhang, Er-Ping
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical switching network is provided. The optical switching network has N input couplers each having a cell input port and a recursive input port N output, couplers each having a cell output port and a recursive output port N/2 switch, couplers connected between the input couplers and the output couplers and a, controller having a routing table for generating control signals for the respective input, output, and switch couplers upon input of cells. The optical switching network has a single-stage optical recursive loop in which an x-numbered recursive output port is connected to a 2x-numbered recursive input port if 0 ~ x ( N/2 and the, x-numbered recursive output port is connected to a …
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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 16, 1998 and granted June 25, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 16, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 16, 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.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.