{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9698914","patent":{"patent_number":"US-9698914","title":"Recovering data from quadrature phase shift keying modulated optical signals","assignee":null,"inventors":[],"filing_date":"2014-03-28T00:00:00.000Z","publication_date":"2017-07-04T00:00:00.000Z","cpc_codes":["H04B","H04B","H04B","H04L","H04L"],"num_claims":18,"abstract":"Systems, devices and techniques for processing received QPSK modulated optical signals include sampling the received signal at twice the baud rate, thereby producing samples that are then processed as 9-QAM symbols using a decision directed least squares optimization method. A third stage of channel equalization is filtering performs channel equalization to mitigate linear filtering effects along the transmission link. Data bits are then recovered from the resulting symbol estimates. The received optical signal may also include dual polarized signals for increased bandwidth capacity."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Recovering data from quadrature phase shift keying modulated optical signals","description":"Systems, devices and techniques for processing received QPSK modulated optical signals include sampling the received signal at twice the baud rate, thereby producing samples that are then processed as","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9698914","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-9698914","citation_suggestion":"Patentable. \"Recovering data from quadrature phase shift keying modulated optical signals\" (US-9698914). https://patentable.app/patents/US-9698914","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9698914","json":"https://patentable.app/api/llm-context/US-9698914","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T10:54:02.185Z"}