Optical waveguides – Optical waveguide sensor
Reexamination Certificate
2006-08-15
2006-08-15
Connelly-Cushwa, Michelle (Department: 2874)
Optical waveguides
Optical waveguide sensor
C385S013000, C385S029000
Reexamination Certificate
active
07092586
ABSTRACT:
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 by use of a coupler 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 optic communication cable. In preferred embodiments, the active signal of a multimode optical fiber is monitored for both signal degradation and transient power disturbance patterns that could indicate fiber damage or physical intrusion. A translator can be provided in an existing optical fiber system in which the data signals are translated in wavelength and/or launch conditions to optimize the monitoring signals in an otherwise non-optimized system.
REFERENCES:
patent: 6819849 (2004-11-01), Tangonan et al.
patent: WO 96/08695 (1996-03-01), None
patent: WO 00/37925 (2000-06-01), None
patent: WO 00/67400 (2000-11-01), None
Bridges Mark K.
Murphy Cary R.
Vokey David E.
Battison Adrian D.
Connelly-Cushwa Michelle
Dupuis Ryan W.
Network Integrity Systems Inc.
Williams Michael R.
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