发明名称 |
Monitoring individual fibers of an optical cable for intrusion |
摘要 |
Some or all of the optical fibers of a single-mode or multi-mode cable are monitored for intrusion by transmitting through the fibers a signal which can be analyzed for changes in its characteristics which are indicative of movement as a prelude to an intrusion event. To avoid independent monitors of all of the fibers, in some cases the same light signal is looped through a plurality of the fibers in series by passive jumpers. Switches can be used to disconnect out those fibers which are compromised. As an alternative a plurality of separate monitoring signals can be provided each associated with its own sensor where unique combinations of the signals are transmitted through separate fibers allowing a higher number of fibers to be monitored than the number of signals.
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申请公布号 |
US7706641(B2) |
申请公布日期 |
2010.04.27 |
申请号 |
US20060461917 |
申请日期 |
2006.08.02 |
申请人 |
NETWORK INTEGRITY SYSTEMS, INC. |
发明人 |
MURPHY CARY R.;BRIDGES MARK K.;GIOVANNI JOSEPH;VOKEY DAVID E.;GOERTZEN DANIEL M. |
分类号 |
G02B6/00 |
主分类号 |
G02B6/00 |
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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