Cross-connection of wavelength-division-multiplexed high speed optical channels
CA 2209762 C · Owner: Nec Corporation · Inventors: Nishino, Masaru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cross-connection device has two three-port optical circulators for being supplied with wavelength-division-multiplexed optical signals each having a plurality of wavelengths from respective input ports, a fiber grating mirror inserted between the three-port optical circulators, for reflecting only an optical signal having a certain wavelength and passing optical signals having other wavelengths a fiber, grating mirror controller for controlling the wavelength reflected by the fiber grating mirror and, two output ports for outputting cross-connected wavelength-division-multiplexed optical signals from the optical circulators. The fiber grating mirror controller controls the temperature and …
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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 4, 1997 and granted March 27, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 4, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 4, 2019.
- 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.