{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8494313","patent":{"patent_number":"US-8494313","title":"Monitoring eDC polarization inverse filter coefficients to identify real-time physical intrusion into a core or metro optical network","assignee":null,"inventors":[],"filing_date":"2009-04-06T00:00:00.000Z","publication_date":"2013-07-23T00:00:00.000Z","cpc_codes":["H04B"],"num_claims":9,"abstract":"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."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Monitoring eDC polarization inverse filter coefficients to identify real-time physical intrusion into a core or metro optical network","description":"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 ","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8494313","license":"CC-BY-4.0-like","license_terms":"AI-generated analysis on this page (summary, layman_explanation, technical_analysis, business_analysis, faqs) may be reused with attribution and a visible link back to the canonical URL above. Patent abstracts, claims, and bibliographic data are USPTO public domain.","required_link":"https://patentable.app/patents/US-8494313","citation_suggestion":"Patentable. \"Monitoring eDC polarization inverse filter coefficients to identify real-time physical intrusion into a core or metro optical network\" (US-8494313). https://patentable.app/patents/US-8494313","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8494313","json":"https://patentable.app/api/llm-context/US-8494313","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-31T05:14:14.444Z"}