Optical intrusion detection system using mode coupling
First Claim
1. An optical intrusion detection system comprising:
- a light source;
an optical splitter for splitting light emitted from the light source and transmitted via an optical fiber;
a plurality of detectors for detecting light power values split by the optical splitter; and
a determiner for determining intrusion or non-intrusion by performing a predetermined operation on the output of each of the detectors.
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Accused Products
Abstract
An optical intrusion detection system including a light source, an optical splitter for splitting light emitted from the light source and transmitted via an optical fiber, a plurality of detectors for detecting light power values split by the optical splitter, and a determiner for determining intrusion or non-intrusion by performing a predetermined operation on the output of each of the detectors. According to this system, light having mode coupling while traveling through a multi-mode optical fiber is split, and the split light power values are measured and compared to each other, so that a dynamic change of an optical signal and a static change in light loss due to the physical disturbance from an intruder can be simultaneously measured. Also, an optical splitter can be designed in consideration of the external environment.
11 Citations
5 Claims
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1. An optical intrusion detection system comprising:
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a light source;
an optical splitter for splitting light emitted from the light source and transmitted via an optical fiber;
a plurality of detectors for detecting light power values split by the optical splitter; and
a determiner for determining intrusion or non-intrusion by performing a predetermined operation on the output of each of the detectors. - View Dependent Claims (2, 3, 4, 5)
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Specification