Optical waveguides – Optical waveguide sensor – Including physical deformation or movement of waveguide
Reexamination Certificate
2006-11-28
2006-11-28
Lee, John D. (Department: 2874)
Optical waveguides
Optical waveguide sensor
Including physical deformation or movement of waveguide
C340S541000, C340S555000, C385S011000, C385S012000
Reexamination Certificate
active
07142737
ABSTRACT:
A telecommunications optical fiber is secured against intrusion by detecting manipulation of the optical fiber prior to an intrusion event. This can be used in a non-locating system where the detection end is opposite the transmit end or in a locating system which uses Fresnel reflections and Rayleigh backscattering to the transmit end to detect and then locate the motion. The Rayleigh backscattering time sliced data can be stored in a register until an intrusion event is detected. The detection is carried out by a polarization detection system which includes an optical splitter which is manufactured in simplified form for economic construction. This uses a non-calibrated splitter and less than all four of the Stokes parameters. It can use a polarimeter type function limited to linear and circular polarization or two linear polarizers at 90 degrees.
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Bridges Mark K.
Murphy Cary R.
Vokey David E.
Battison Adrian D.
Dupuis Ryan W.
Lee John D.
Network Integrity Systems Inc.
Peace Rhonda S.
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