Integrated optical mach zehnder structures
CA 2299794 A1 · Owner: Nortel Networks Corporation · Inventors: Thompson, George Horace Brook
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An integrated optical Mach Zehnder structure has an optical path length modifying heater (phase-shifter) associated with a portion of the length of each interference arm of the Mach Zehnder. The portion of the length of the interference arm associated with one of the heaters is flanked with trenches that provide that portion with a temperature coefficient of birefringence different from that of the corresponding portion of the other interference arm. The invention is applicable not only to stand-alone Mach Zehnders but also to, more complex Mach Zehnder structures having a series combination of two or more component Mach Zehnders that are close coupled by having the two outputs of one …
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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 February 28, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 28, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 28, 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.