Optical switching device with passive input and output stages and activeamplifier in a matrix stage
CA 2118511 C · Owner: Fiddyment, Philip John · Inventors: Fiddyment, Philip John; Robertson, Michael James; Burton, Julie
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A semiconductor optical switching device comprises a passive optical input stage (1), a matrix stage (2) and a passive optical output stage (3). The matrix stage incorporates active amplifiers (6) the , switch as a whole being therefore part passive and part active. Control over the switching configuration is provided by electrical inputs to the amplifiers (6). The matrix stage (2) guides optical signals in a direction transverse to optical signals propagating in the input or output stages (1 3). With this , configuration, fixed change in direction of the optical paths available to optical signals propagating through the device are provided by splitters (4), combiners (5) and total …
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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 May 5, 1993 and granted October 5, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 5, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 5, 2015.
- 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.