{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9742520","patent":{"patent_number":"US-9742520","title":"Optical switching system with a colorless, directionless, and contentionless ROADM connected to unamplified drop channels","assignee":null,"inventors":[],"filing_date":"2015-09-18T00:00:00.000Z","publication_date":"2017-08-22T00:00:00.000Z","cpc_codes":["H04J","H04J","H04J","H04J","H04Q","H04Q","H04Q","H04Q","H04Q"],"num_claims":14,"abstract":"Components of an optical communications network are described at a node of the network providing switching from one or more degrees of received optical signal routed to a plurality of receivers. The switch at the node generally includes a passive reconfigurable optical add drop multiplexer (ROADM) having drop or output ports that connector to optical channels leading to optical receivers without optical amplifiers between the ROADM outputs and the receivers. Configurations of the node and corresponding parameters are described that provide for use of lower cost components due to the absence of an array of optical amplifiers connected to the ROADM outputs."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Optical switching system with a colorless, directionless, and contentionless ROADM connected to unamplified drop channels","description":"Components of an optical communications network are described at a node of the network providing switching from one or more degrees of received optical signal routed to a plurality of receivers. The s","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9742520","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-9742520","citation_suggestion":"Patentable. \"Optical switching system with a colorless, directionless, and contentionless ROADM connected to unamplified drop channels\" (US-9742520). https://patentable.app/patents/US-9742520","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9742520","json":"https://patentable.app/api/llm-context/US-9742520","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T06:24:41.073Z"}