Optical amplifier
CA 2048203 C · Owner: Koninklijke Philips Electronics N.V. · Inventors: Tiemeijer, Lukas Frederik; Thijs, Petrus Johannes Adrianus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to an optical amplifier with a semiconductor body comprising a layer structure grown on a substrate with an active layer, between two cladding layers a strip-shaped amplification region being bounded by two end faces of low reflection which form the input and output faces for the, radiation to be amplified. The active layer comprises a number of quantum well (QW) layers with direct band transition and separated by barrier layers of a, different semiconductor material a first portion of which QW layers is under tensile stress. Such amplifiers are used inter alia in optical glass fibre communication systems. The known amplifier is owing to the tensile stress less …
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 31, 1991 and granted January 22, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 31, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 31, 2013.
- 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.