{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8503887","patent":{"patent_number":"US-8503887","title":"Pre-equalized optical transmitter and pre-equalized optical transmission system","assignee":null,"inventors":[],"filing_date":"2009-02-27T00:00:00.000Z","publication_date":"2013-08-06T00:00:00.000Z","cpc_codes":["H04B","H04B","H04B"],"num_claims":17,"abstract":"A pre-equalized optical transmitter includes, a laser source; a duo-binary pre-coder circuit; a pre-equalization circuit for applying an inverse function of chromatic dispersion; at least two D/A converters; and an optical field modulator comprising at least two input terminals for an electric signal. The pre-equalized optical transmitter: converts, by the duo-binary pre-coder circuit, a digital information signal of a predetermined symbol time to be transmitted into a digital complex signal including one sampling point per symbol; equalizes, by the pre-equalization circuit, degradation in transmission of the digital complex signal; converts, by the D/A converters, the equalized digital complex signal into an analog signal; suppresses an analog signal leaking outside a Nyquist bandwidth by at least 23 dB; modulates, by the optical field modulator, light output from the laser source with the analog signal to generate a modulated optical field signal; and transmits the modulated optical field signal."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Pre-equalized optical transmitter and pre-equalized optical transmission system","description":"A pre-equalized optical transmitter includes, a laser source; a duo-binary pre-coder circuit; a pre-equalization circuit for applying an inverse function of chromatic dispersion; at least two D/A conv","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8503887","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-8503887","citation_suggestion":"Patentable. \"Pre-equalized optical transmitter and pre-equalized optical transmission system\" (US-8503887). https://patentable.app/patents/US-8503887","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8503887","json":"https://patentable.app/api/llm-context/US-8503887","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-30T15:34:42.706Z"}