Optical transmitter, and wavelength multiplexing optical transmission apparatus using the same
CA 2312150 A1 · Owner: Iwafuji, Takami · Inventors: Iwafuji, Takami
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In an optical transmitter, an oscillation wavelength of a semiconductor laser diode is controlled so as to stabilize the oscillation wavelength, while neither forward project light nor a beam splitter is employed. The optical transmitter is arranged by employing: an optical waveguide path into which forward projection light of the semiconductor laser diode is entered; a wavelength filter containing an oscillation wavelength of the semiconductor laser diode in a wavelength band where a transmission wavelength band is transferred to a reflection wavelength band and vice versa for causing a portion, of backward projection light of the semiconductor laser diode to pass therethrough to output …
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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 June 23, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 23, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 23, 2022.
- 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.