Technique for improving performance in an optical transmission system
CA 2133132 A1 · Owner: Jopson, Robert Meachem · Inventors: Jopson, Robert Meachem; Nyman, Bruce Mitchell; Homsey, Glen M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The effects of polarization dependent hole burning are reduced by simultaneouslylaunching a first optical signal carrying information and having a first characteristic wavelength and a second optical signal carrying different information and having a second characteristic wavelength, where the first and second optical signals have substantially orthogonal relative polarizations, into the same transmission path as a combined optical signal. The launched optical signals have equal optical power levels. Thus the noise, associated with one optical signal cannot be preferentially enhanced with respect to the information carried by the other optical signal. Furthermore because the combined, …
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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 September 28, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 28, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 28, 2016.
- 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.