{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9780903","patent":{"patent_number":"US-9780903","title":"Optical wavelength demultiplexer having optical interference filters connected in cascade","assignee":null,"inventors":[],"filing_date":"2015-01-27T00:00:00.000Z","publication_date":"2017-10-03T00:00:00.000Z","cpc_codes":["H04J"],"num_claims":2,"abstract":"An optical wavelength demultiplexer includes a wavelength demultiplexing device, a first wavelength filter and a first- and second-stage wavelength sub-filters. The wavelength demultiplexing device demultiplexes an input light into a first wavelength band including wavelengths λ1 and λ2 in the vicinity of 1310 nm and a second wavelength band including a wavelength λ3 of 1490 nm and a wavelength λ4 of 1550 nm to output. The first-stage wavelength sub-filter removes the wavelength λ2 longer than 1310 nm from the second wavelength band and transmits the wavelength λ3 of 1490 nm. The second-stage wavelength sub-filter removes the wavelength λ4 of 1550 nm and outputs the wavelength λ3 of 1490 nm, which is the remainder of the selected lights, with a sufficient wavelength spectral purity."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Optical wavelength demultiplexer having optical interference filters connected in cascade","description":"An optical wavelength demultiplexer includes a wavelength demultiplexing device, a first wavelength filter and a first- and second-stage wavelength sub-filters. The wavelength demultiplexing device de","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9780903","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-9780903","citation_suggestion":"Patentable. \"Optical wavelength demultiplexer having optical interference filters connected in cascade\" (US-9780903). https://patentable.app/patents/US-9780903","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9780903","json":"https://patentable.app/api/llm-context/US-9780903","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T07:14:16.631Z"}