Interferometer
CA 2089871 C · Owner: Ipg Photonics Corporation · Inventors: Webb, Roderick Peter; O'Neill, Alan William
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A Sagnac interferometer (19) is defined by four port 50:50 optical fibre coupler (20) two output ports (38, 40) of which are coupled together by a non-linear semiconductor laser amplifier (3) in series between a pair of optical fibres (22 24). The coupling, losses between the ports (38 40) and the amplifier (30) are different. An input pulse coupled to port (34) of the coupler (20) is split into two portions which counterpropagate from one of the output ports (38 40) to the other. The portions return to the coupler (20) with an intensity dependent relative phase shift. This provides switching of an input pulse at the input port (34) between the input ports (34 and 36) dependent on the …
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 August 30, 1991 and granted August 12, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 30, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 30, 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.