Optical wavelength multiplexer/demultiplexer
CA 2212975 C · Owner: Inaba, Kimio · Inventors: Akiba, Kenji; Inaba, Kimio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical wavelength multiplexer/demultiplexer has an input channel waveguide, an input slab waveguide an arrayed-waveguide, grating having N channel waveguides an output slab waveguide, and N, output channel waveguides. Each output channel waveguide is provided with an outwardly tapered end. Each tapered end has a width at its end surface which becomes larger as the output channel waveguide becomes distant from the symmetrical axis of the output slab waveguide. The loss differences suffered by each separated signal may be substantially reduced.
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 August 13, 1997 and granted June 19, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 13, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 13, 2019.
- 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.