{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9825698","patent":{"patent_number":"US-9825698","title":"Determining in-band optical signal-to-noise ratio in polarization-multiplexed optical signals using signal correlations","assignee":null,"inventors":[],"filing_date":"2014-12-09T00:00:00.000Z","publication_date":"2017-11-21T00:00:00.000Z","cpc_codes":["H04B","H04B","H04B"],"num_claims":21,"abstract":"A method and apparatus for determining in-band OSNR in optical information signals, e.g. in polarization-multiplexed QPSK and higher-order M-ary QAM signals, are disclosed. A correlation measurement of the signal amplitude or power at two distinct optical frequencies of the signal may be used to determine the in-band optical noise in the signal. A measurement of the signal power may be used to determine the OSNR based on the determined in-band noise."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Determining in-band optical signal-to-noise ratio in polarization-multiplexed optical signals using signal correlations","description":"A method and apparatus for determining in-band OSNR in optical information signals, e.g. in polarization-multiplexed QPSK and higher-order M-ary QAM signals, are disclosed. A correlation measurement o","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9825698","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-9825698","citation_suggestion":"Patentable. \"Determining in-band optical signal-to-noise ratio in polarization-multiplexed optical signals using signal correlations\" (US-9825698). https://patentable.app/patents/US-9825698","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9825698","json":"https://patentable.app/api/llm-context/US-9825698","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T15:59:44.557Z"}