Dispersion shift optical fiber and wavelength division multiplex transmission system using the same
CA 2201061 A1 · Owner: The Furukawa Electric Co. Ltd. · Inventors: Akasaka, Youichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a dispersion shift optical fiber which is capable of a zero dispersion wavelength division multiplex optical transmission in the wavelength band of 1550nm and a wavelength division multiplex transmission using the optical fiber. With the dispersion shift optical fiber according to the invention, the relationship between the relative refractive index difference .DELTA. 1 of a core of an optical fiber the relative refractive index difference .DELTA. 2 of the first clad covering the core, and the relative refractive index difference .DELTA. 3 of the second clad covering the outer circumferential side thereof is .DELTA. 1 > .DELTA. 3 > .DELTA. 2 the mean dispersion slope …
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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 March 26, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 26, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 26, 2019.
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Timeline
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.