Wavelength division multiplexer and demultiplexer
CA 2077881 C · Owner: Van Der Tol, Johannes Jacobus Gerardus Maria · Inventors: Van Der Tol, Johannes Jacobus Gerardus Maria
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention provides a wavelength division multiplexer and a wavelength division demultiplexer by combining a wavelength-selective mode converter (3) with a wavelength-independent mode splitter (5). The demultiplexer comprises a monomodal input channel (1) an adapter (2) to the, bimodal input of a 100%TX00-TY01(.lambda.1) mode converter (3) a, bimodal junction channel (4), and a mode splitter (5) having a first output channel (6) and a second output channel (7) both, monomodal, the first output channel (6) having a higher propagation constant than the second. A .lambda.1 component which, propagates with a polarisation TX(TE or TM) in an input signal Si1(.lambda.1,.lambda.2,.lambda.3,--), …
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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 September 9, 1992 and granted February 25, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 9, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 9, 2014.
- 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.