Optical amplifier and a method of controlling the optical amplifier
CA 2337183 C · Owner: Sumitomo Electric Industries, Ltd. · Inventors: Kakui, Motoki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In the optical amplifier (200) of the present invention a part of signal , light inputted to an input connector (201) is branched out by an optical coupler (211), whereby its power is detected by a light-receiving device (241). According to the power of input signal light detected by the lightreceiving device, the temperature of an amplification optical fiber (231) is controlled by a temperature control section (261) by way of a Peltier device (233). On the other hand, a part of the signal light outputted from an output connector (202) is branched out by an optical coupler (214) whereby its power , is detected by a light-receiving device (242). A gain is determined from the ratio …
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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 16, 2000 and granted February 11, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 16, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 16, 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.