Simplified wdm fused fiber coupler design
CA 2022367 C · Owner: Johnson, Derwyn C. · Inventors: Johnson, Derwyn C.; Bilodeau, Francois C.; Hill, Kenneth O.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A two-channel optical fiber fused coupler comprising two optical fibers, each with a core and cladding, fused together at a narrow tapered waist. The first channel is at a wavelength of .lambda.1 and the second channel is at, a wavelength of .lambda.2 where .lambda.2 is longer than .lambda.1. The coupler is fabricated to, have a characteristic wavelength .lambda.0 such that for wavelengths .lambda.2 longer than, .lambda.0 coupling occurs and for wavelengths .lambda.1 shorter that .lambda.0 the light at .lambda.1 is, core guided throughout the coupler and thus does not couple across.
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, 1990 and granted December 17, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 31, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 31, 2012.
- 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.