{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8467687","patent":{"patent_number":"US-8467687","title":"Optical transmitter and optical OFDM communication system","assignee":null,"inventors":[],"filing_date":"2009-12-18T00:00:00.000Z","publication_date":"2013-06-18T00:00:00.000Z","cpc_codes":["H04B","H04L","H04L","H04L","H04L"],"num_claims":10,"abstract":"Distortion of a reception signal which is attributable to interference between subcarriers during photoelectric conversion is reduced in an optical OFDM communication system without broadening the signal band. A transmission signal processing unit (100) in a transmitter is provided with a distortion generating circuit (distortion generating unit) (170). A subcarrier signal is utilized as an input signal for the circuit. The distortion generating circuit (170) generates a baseband OFDM signal by means of inverse FFT calculation using the input signal, computes the square of the absolute value of the signal, and restores the subcarrier signal by mean of FFT calculation. Because interference between subcarriers is also included in the signal, the distortion element generated by the interference between the subcarriers can be extracted when the difference from the input signal is found. The signal obtained by subtracting the distortion element from the subcarrier signal, which has been modulated using the original data to be communicated, is used as the transmission signal. The transmission signal is photoelectrically converted with a receiver. The interference between subcarriers generated at this time is smaller than when the aforementioned processing is not performed."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Optical transmitter and optical OFDM communication system","description":"Distortion of a reception signal which is attributable to interference between subcarriers during photoelectric conversion is reduced in an optical OFDM communication system without broadening the sig","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8467687","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-8467687","citation_suggestion":"Patentable. \"Optical transmitter and optical OFDM communication system\" (US-8467687). https://patentable.app/patents/US-8467687","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8467687","json":"https://patentable.app/api/llm-context/US-8467687","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-31T11:55:45.296Z"}