{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8478125","patent":{"patent_number":"US-8478125","title":"Optical PON network using passive DPSK demodulation","assignee":null,"inventors":[],"filing_date":"2008-04-24T00:00:00.000Z","publication_date":"2013-07-02T00:00:00.000Z","cpc_codes":["H04J","H04B","H04J","H04J","H04J","H04J","H04J","H04Q","H04J","H04Q","H04Q"],"num_claims":15,"abstract":"An optical PON network comprises a central office which generates N DPSK modulated optical signals, where N is an integer greater than 1, an optical coupling which connects the N signals to at least one optical fiber, a passive distribution node located remotely from the central office which has at least one input port that is coupled to the fiber and a plurality of output ports, the node being arranged to transmit a first wavelength of the N signals to at least one of its output ports, and at least one optical network unit connected through a respective optical fiber to the first output port of the passive distribution node. The passive distribution node comprises an arrayed waveguide grating which provides a passive optical connection between its input port and the first output port and which for that connection functions as a bandpass filter having a profile and bandwidth selected such that the DPSK optical signal passed to the input node is converted to an intensity modulated signal at the output port."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Optical PON network using passive DPSK demodulation","description":"An optical PON network comprises a central office which generates N DPSK modulated optical signals, where N is an integer greater than 1, an optical coupling which connects the N signals to at least o","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8478125","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-8478125","citation_suggestion":"Patentable. \"Optical PON network using passive DPSK demodulation\" (US-8478125). https://patentable.app/patents/US-8478125","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8478125","json":"https://patentable.app/api/llm-context/US-8478125","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-30T15:39:33.253Z"}