Multimode fiber optic intrusion detection system
CA 2529654 C · Owner: Network Integrity Systems Inc. · Inventors: Murphy, Cary R.; Bridges, Mark K.; Vokey, David E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and system of intrusion detection system for a multimode fiber optic cable. A light signal is launched into the cable fiber to establish a narrow , spectral width, under-filled non-uniform mode field power distribution in the cable. A , small portion of the higher order signal modes arriving at the remote end of the cable , is sampled and monitored for transient changes in the mode field power distribution. , The power distribution changes with physical disturbance of the cable. When those , changes are detected as being characteristic of fiber intrusion the system , activates , an alarm. This method can sense and alarm any attempt to access the optical fibers , in a fiber …
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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 2, 2004 and granted April 3, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 2, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 2, 2026.
- 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
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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.