Apparatus and method for controlling an extinction ratio of a laser diode over temperature
CA 2126323 A1 · Owner: Geller, William L. · Inventors: Geller, William L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A circuit for controlling an extinction ratio of a laser whose temperature can change over time includes first and second feedback loops which monitor a LOW output power of the laser during a first frame training pulse and a HIGH laser output power during a second frame training pulse. The LOW power output is compared to a preset dynamic LOW power reference, and a LOW bias current applied to be laser is incrementally increased or decreased so as to keep this LOW power output toggling about this LOW reference. Similarly the HIGH, power output is compared to a HIGH power reference and a, modulation current for the laser is incrementally increased or decreased to keep the HIGH laser output …
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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 December 21, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 21, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 21, 2014.
- 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.