Intrusion Detecting System With Polarization Dependent Sensing Elements
First Claim
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1. A detection system comprising:
- (i) a length of optical fiber; and
(iii) an OTDR coupled to said fiber, said OTDR comprising (a) a radiation source providing pulsed radiation to said fiber, (b) a detector detecting radiation that is backscattered through the fiber, and (c) a processor capable of analyzing the variation of the radiation that is backscattered through the fiber;
wherein at least two polarization dependent sensing elements are positioned along the length of optical fiber.
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Abstract
A detection system includes a length of optical fiber and an OTDR coupled to the optical fiber. The OTDR includes a radiation source providing pulsed radiation to the fiber, a detector detecting radiation that is backscattered through the fiber, and a processor capable of analyzing the variation of the radiation that is backscattered through the fiber. At least two polarization dependent sensing elements are positioned along the length of optical fiber.
12 Citations
20 Claims
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1. A detection system comprising:
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(i) a length of optical fiber; and (iii) an OTDR coupled to said fiber, said OTDR comprising (a) a radiation source providing pulsed radiation to said fiber, (b) a detector detecting radiation that is backscattered through the fiber, and (c) a processor capable of analyzing the variation of the radiation that is backscattered through the fiber; wherein at least two polarization dependent sensing elements are positioned along the length of optical fiber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for detecting a disturbance along a length of optical fiber comprising the steps of:
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(i) emitting pulsed radiation into a length of optical fiber; (ii) measuring radiation that is backscattered through the optical fiber; and (iii) analyzing the variation of said measured radiation to produce information related to change in said measured radiation over time along the length of the fiber;
wherein at least two polarization dependent sensing elements are positioned along the length of optical fiber. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification