Active fiber loss monitor and method
First Claim
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8. In a system having at least two nodes connected by a fiber path, a method for detecting a fiber condition along the fiber path, the method comprising the steps of:
- providing a feedback path to couple with the fiber path to form a feedback loop; and
measuring the fiber condition on the fiber path in response to a detected change along the feedback path.
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Abstract
A system (10) for detecting a small fiber loss (102) on a fiber (104) includes a first channel (106) having a first wavelength coupled to the fiber (104). A second channel (108) having a second wavelength different than the first wavelength is also coupled to the fiber (104). At least one photodetector circuitry (110) is coupled to the fiber (104) at a monitor point (112) for detecting a change in the power ratio between the first and second channels for detecting the small fiber communication loss (102) at any location along the fiber (104).
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20 Claims
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8. In a system having at least two nodes connected by a fiber path, a method for detecting a fiber condition along the fiber path, the method comprising the steps of:
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providing a feedback path to couple with the fiber path to form a feedback loop; and
measuring the fiber condition on the fiber path in response to a detected change along the feedback path. - View Dependent Claims (9, 10)
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11. A method for detecting fiber integrity, the method comprising the steps of:
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monitoring two out-of-signal-band wavelengths;
determining the power ratio of the two out-of-signal-band wavelengths, and alarming a fiber integrity tampered condition when the power ratio of the two out-of-signal-band wavelengths changes significantly. - View Dependent Claims (1, 2, 3, 4, 5, 6, 7, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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15-1. The method of claim 14 further comprising disconnecting the fiber for minimizing the fiber security breach.
Specification