发明名称 |
Method and apparatus for determining the optical distance of a threat on an optical fiber |
摘要 |
<p>The optical distance along a buried optical fiber (12) from a particular location (13) therealong to a central facility (10) is measured by first applying an intentional stress to the fiber in the form of a vibration signal (35) transmitted into the ground. A timing signal (36) is transmitted to the central facility (10) in synchronism with the application of the stress. Using the timing signal as a reference, the central facility can determine the time difference between when the stress was applied, and when the central facility detected the stress. From the time difference, and a knowledge of the propagation rate of the timing signal, the central facility can establish the optical distance to the particular location at which the stress was applied. <IMAGE></p> |
申请公布号 |
EP1037410(A2) |
申请公布日期 |
2000.09.20 |
申请号 |
EP20000300496 |
申请日期 |
2000.01.24 |
申请人 |
AT&T CORP. |
发明人 |
ESLAMBOICHI, HOSSEIN;HUFFMAN, JOHN SINCLAIR |
分类号 |
H04B10/08;(IPC1-7):H04B10/08 |
主分类号 |
H04B10/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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