Erbium-doped fiber amplifier coupling device
CA 2020759 C · Owner: Desurvire, Emmanuel · Inventors: Desurvire, Emmanuel; Giles, Randy C.; Whalen, Matthew S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention is directed toward reducing substantially the loss incurred when two optical fibers of different mode diameters are coupled together. In this invention the coupling of one fiber to that of another where the fibers are of different mode diameters is not with a tapered fusion core-to-core splice, but with an, evanescent field fiber coupler. Briefly to achieve amplification of a weak optical signal, an amplifying fiber is inserted into the system at one or a plurality oflocations. More specifically at a desired location, the transmission fiber is severed to provide two sections and the severed sections are transversely coupled to theamplifying fiber. The weak signal from the …
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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 July 9, 1990 and granted February 15, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 9, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 9, 2012.
- 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.