Photodetector with spectrally extended responsivity
CA 2269298 A1 · Owner: Bookham Technology Plc · Inventors: Svilans, Mikelis Nils
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A photodetector has an extended wavelength range combined with high responsivity and reliability. It includes an active region having alternating compressive and tensile strain layers arranged so that the total effective strain of the active region is balanced. The thickness of each layer is limited so that a product of a thickness by strain is not exceeding about 20%nm to avoid formation of crystalline defects. The layers with higher optical absorption constant are made thicker than the layers with lower absorption constant to provide the required responsivity of the detector. In one embodiment the active region is formed on InP substrate and includes alternating 0.25% compressive strain …
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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 April 16, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 16, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 16, 2021.
- 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.