Intrusion detection system for secure fiber optics
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United States of America Patent
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Nov 16, 2004
Issued Date -
N/A
app pub date -
Jul 29, 1988
filing date -
Oct 25, 1985
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Abstract
Methods and apparatus are disclosed for an intrusion detection system for secure fiber optic communication systems. A guard signal is transmitted over the optical fiber communication link and both the modal power and modal phase delay of this signal are monitored. Intrusions into the link for the purpose of intercepting information being transmitted, cause changes in the modal phase delay and power of the guard signal. These changes, when detected by the monitoring system, indicate the presence of an intruder. A fiber profile which is optimal for both transmission and intrusion detection purposes is described.
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