Optical communication system with a fiber-optic amplifier
CA 2055274 C · Owner: Alcatel N.V. · Inventors: Heidemann, Rolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In an optical communication system with a fiber-optic amplifier (10) which includes a wavelength-selective fiber-optic coupler (12) for coupling pump light into the amplifying length of fiber (11), according to the invention, an additional optical signal e.g. a service-, channel signal, is transmitted from the location of the fiber-optic amplifier (10) in one direction or the other by being used to modulate the pump light. Since the pump light is not completely absorbed in the amplifying length of fiber (11), a sufficient portion is transferred from the length of fiber (11) into the optical waveguide (15) of the optical communication system and passes down the optical waveguide to the end …
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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 November 13, 1991 and granted January 27, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 13, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 13, 2013.
- 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.