Two-dimensional photonic crystal multiplexer/demultiplexer
CA 2537206 C · Owner: Noda, Susumu · Inventors: Akahane, Yoshihiro; Noda, Susumu; Asano, Takashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An object of the present invention is to provide a multiplexer/demultiplexer capable , of preventing a decrease in multiplexing/demultiplexing efficiency due to an error in , wavelength or due to a crosstalk with other wavelengths. A two-dimensional photonic crystal , having holes 22 cyclically arranged is provided with an input waveguide 23 and an output , waveguide 24. Located between the two waveguides are two point-like defects 25 and 26, each consisting of a region devoid of the holes 22. From the light including various , wavelengths and propagating through the input waveguide 23 the two point-like , defects , extract a ray of light having a wavelength determined by the shape of …
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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 August 24, 2004 and granted May 15, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 24, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 24, 2026.
- 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.