Optical amplifier
CA 2127486 C · Owner: Dugan, John Michael · Inventors: Dugan, John Michael; Maxham, Kenneth Yost
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Various optical amplifier configurations are disclosed. In one configuration, an optical amplifier provides an amplified output signal through use of a pumping device. The output signal is split to an output and a feedback input. The feedback signal is converted to a current which is sensed by a controller. The controller adjusts the amount of current to the pumping device in various instances. In one instance the, current is controlled to prevent overdriving the pumping device. In another instance, the current is controlled to maintain the output signal at a substantially constant level. In another configuration, the optical amplifier is coupled to a ratio computation block which measures …
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 July 6, 1994 and granted June 29, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 6, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 6, 2016.
- 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.