Optical transmission system
CA 2277409 C · Owner: Murakami, Makoto · Inventors: Maeda, Hideki; Murakami, Makoto; Imai, Takamasa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
It is the objective of the present invention to resolve the limitations on transmission capacity and distance in a system by means of a simple design through the provision of a means for restraining the deterioration in transmission characteristics that is the result of accumulation over the entire system of third order dispersion in the optical fiber. In the present invention there is provided an optical fiber transmission path in which positive dispersion fibers 40,46,52,and 54 and negative dispersion fibers 42,48 (referred to as optical fibers hereinafter) which have at least second and third order dispersion of mutually opposite signs are combined. In addition, the optical fiber is …
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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 July 8, 1999 and granted February 11, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 8, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 8, 2021.
- 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.