Reflection monitor optical fiber coupler manufacturing system and method
CA 2070215 C · Owner: Suganuma, Hiroshi · Inventors: Yokota, Hiroshi; Fukuma, Masumi; Suganuma, Hiroshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In an optical fiber coupler fabricating process where couplers are successively formed by heating elongating and, cutting a plurality of long optical fibers light is led into, the first end of the fiber reflected at the second end of, the coupler and the reflected light is monitored by photodetectors. In this manner, an exact splitting ratio can be obtained. Techniques for inimi zing measuring errors caused by the inter-reflected-light interference the, inter-Rayleigh-scattering-light interference and the interference, between the reflected light and the Rayleigh scattering light, while exploiting the advantageous feature of the reflection monitor method that the fiber connection work for …
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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 June 2, 1992 and granted February 10, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 2, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 2, 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.