Polarization-based sensor for secure fiber optic network and other security applications
First Claim
1. A method of sensing an attempted intrusion comprising:
- transmitting light of at least one known state of polarization within a first optical fiber, wherein said first optical fiber is in proximity to a secured element, and wherein said light originates from a polarized source;
receiving said light at a fiber optic polarizer, wherein said fiber optic polarizer is in line with said first optical fiber; and
identifying an attempted intrusion of said secured element from a change in the state of polarization of said light.
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Accused Products
Abstract
A system, method, and computer program product for sensing an attempted intrusion including measuring changes in the state of polarization (SOP) of light transmitting through an optical fiber. The sensing system including a optical fiber in proximity to a secured element, and a fiber optic polarizer coupled to the optical fiber. The system may also include a transmitter, a receiver, and an electronic component for measuring changes in the state of polarization of the light transmitted through the optical fiber, wherein the light supplies information adequate to determine one or more polarization traces, an averaged trace based on the one or more polarization traces, and an intrusion trace.
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Citations
25 Claims
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1. A method of sensing an attempted intrusion comprising:
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transmitting light of at least one known state of polarization within a first optical fiber, wherein said first optical fiber is in proximity to a secured element, and wherein said light originates from a polarized source;
receiving said light at a fiber optic polarizer, wherein said fiber optic polarizer is in line with said first optical fiber; and
identifying an attempted intrusion of said secured element from a change in the state of polarization of said light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system for sensing an attempted intrusion comprising:
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a first optical fiber in proximity to a secured element;
a transmitter, coupled to said first optical fiber, for sending polarized light of at least one known state of polarization through said first optical fiber;
a fiber optic polarizer coupled to said first optical fiber;
a receiver, coupled to said first optical fiber, for accepting said light within said first optical fiber; and
an electronic component, coupled to said receiver, for measuring changes in the state of polarization of said light, wherein said light supplies information adequate to determine one or more polarization traces, an averaged trace based on said one or more polarization traces, and an intrusion trace. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification