{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8483574","patent":{"patent_number":"US-8483574","title":"Correlation-control QPSK transmitter","assignee":null,"inventors":[],"filing_date":"2010-10-15T00:00:00.000Z","publication_date":"2013-07-09T00:00:00.000Z","cpc_codes":["H04B","H04L","H04L","H04J","H04L"],"num_claims":20,"abstract":"An optical transmitter utilizing a multi-level data modulator to produce a PDM-QPSK signal, a one-bit delay interferometer configured to correlate the multi-level data modulated signal and an optical filter configured to combine the correlated multi-level data modulated signal with one or more neighboring signals prior to transmitting over one of a plurality of optical channels. The PDM-QPSK correlated signal is configured to reduce the signal spectrum thereby increasing spectral efficiency of the transmitted signal."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Correlation-control QPSK transmitter","description":"An optical transmitter utilizing a multi-level data modulator to produce a PDM-QPSK signal, a one-bit delay interferometer configured to correlate the multi-level data modulated signal and an optical ","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8483574","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-8483574","citation_suggestion":"Patentable. \"Correlation-control QPSK transmitter\" (US-8483574). https://patentable.app/patents/US-8483574","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8483574","json":"https://patentable.app/api/llm-context/US-8483574","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-31T01:54:55.182Z"}