Optical waveguides – Optical waveguide sensor
Reexamination Certificate
2008-05-20
2008-05-20
Connelly-Cushwa, Michelle R. (Department: 2874)
Optical waveguides
Optical waveguide sensor
C385S013000, C385S029000, C398S020000, C398S028000, C398S033000
Reexamination Certificate
active
07376293
ABSTRACT:
Intrusion detection of one section only of a multimode fiber uses a light signal launched into the fiber at a location spaced from the source through a single mode fiber to establish a narrow spectral width, under-filled non-uniform mode field power distribution in the fiber. A small portion of the higher order signal modes at the a second location also spaced from the destination is sampled by a tap coupler and monitored for transient changes in the mode field power distribution which are characteristic of intrusion to activate an alarm. 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.
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Bridges Mark K.
Murphy Cary R.
Vokey David E.
Battison Adrian D.
Connelly-Cushwa Michelle R.
Dupuis Ryan W.
Network Intergrity Systems Inc.
Williams Michael R.
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