Optical fiber amplifier
CA 2094732 A1 · Owner: Sumitomo Electric Industries, Ltd. · Inventors: Yokouchi, Jungo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to an optical fiber amplifier including an amplification optical fiber doped with an active material for the optical amplification for amplifying signal light by applying the signal light and pumping light to the amplification optical fiber to amplify the signal light. The optical fiber amplifier comprises optical coupling/dividing means for coupling pumping light emitted from a plurality of light sources for optical pumping, and branching the coupled light into output forward pumping light and backward pumping light a first, optical coupler for coupling the forward pumping light with signal light to apply the coupled light to the input terminal of the amplification …
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 April 23, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 23, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 23, 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
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.