发明名称 |
MONITORING EDC POLARIZATION INVERSE FILTER COEFFICIENTS TO IDENTIFY REAL-TIME PHYSICAL INTRUSION INTO A CORE OR METRO OPTICAL NETWORK |
摘要 |
<p>A fiber network is monitored in order to detect physical intrusion. The state of polarization of an optical fiber is monitored. A fiber tap is determined to have occurred if the state of polarization of the fiber changes beyond a predetermined amount found to be associated with all types of fiber taps. Alternately, it may be determined that a fiber tap has occurred if the state of polarization changes beyond a second predetermined amount and in a predetermined direction. Monitoring of the state of polarization occurs before and after a time period chosen to be less than a time during which the state of polarization of the optical fiber is expected to drift. This step eliminates false positives due to natural fiber PMD drift.</p> |
申请公布号 |
WO2010117989(A1) |
申请公布日期 |
2010.10.14 |
申请号 |
WO2010US30051 |
申请日期 |
2010.04.06 |
申请人 |
NORTEL NETWORKS LIMITED;SCHOFIELD, BRUCE |
发明人 |
SCHOFIELD, BRUCE |
分类号 |
G08B13/00 |
主分类号 |
G08B13/00 |
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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