Secured fiber link system
US-2024137133-A1 · Apr 25, 2024 · US
Monitoring eDC polarization inverse filter coefficients to identify real-time physical intrusion into a core or metro optical network
US9002148B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9002148-B2 |
| Application number | US-201313783710-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 4, 2013 |
| Priority date | Apr 6, 2009 |
| Publication date | Apr 7, 2015 |
| Grant date | Apr 7, 2015 |
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Abstract
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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.
First claim
Opening claim text (preview).
What is claimed is: 1. A method of monitoring a physical condition of an optical waveguide, the method comprising: monitoring, at a state of polarization logic module, dispersion compensation coefficients to determine changes in a state of polarization of an optical signal propagating on the optical waveguide during a time interval; and when the state of polarization is determined to change by more than an amount of drift expected during the time interval, generating a signal at…
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Classifications
- H04B10/85Primary
Electricity · mapped topic
- G02B6/278Primary
Physics · mapped topic
Physics · mapped topic
- G08B13/186Primary
Physics · mapped topic
Physics · mapped topic
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Frequently asked questions
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- What does patent US9002148B2 cover?
- 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 …
- Who is the assignee on this patent?
- Rockstar Consortium Us Lp, RPX Clearing House LLC
- What technology area does this patent fall under?
- Primary CPC classification H04B10/85. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Apr 07 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).