Optical waveguide cross-point switch
CA 2207175 C · Owner: Bell-Northern Research Ltd. · Inventors: Wu, Chi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical waveguide cross-point switch capable of full broadcast and strictly non-blocking operation. The device has a matrix of a plurality of input waveguides and a plurality of output waveguides (MxN). A reflecting surface associated with each intersection may be selectively activated to direct an optical signal on the input line to the associated output line. The reflecting surface may also be employed so as to convert an MxN matrix into a 2(MxN) rearrangeable cross-point switch. Each waveguide is capable of switching a data rate of 10 Gb/s or more. For example with eight wavelength channels used , to impart optical signals to a 16x16 switch a data rate of 1.28 Terabits/second …
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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 November 24, 1995 and granted April 17, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 24, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 24, 2017.
- 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.