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(a) subcarrier multicast and data aggregation with coherent detections; (b) synthesis of high-order quadrature-amplitude modulation (QAM) subcarrier from input low-order QAM twin-SSBs by coherent superposition with direct detection. In addition, a specific algorithm named hierarchical blind phase search was proposed and developed to cope with the imperfect phase rotation in the coherent superposition process. In both cases, error-free operations and clear constellations were experimentally demonstrated for the synthesized high-order subcarrier with either coherent or direct detection, verifying the proposed scheme."}]},{"type":"significance_of_research_achievement","notation":[{"@language":"ja","@value":"The proposed processing schemes would be helpful for effectively managing the subcarrier granularity in subcarrier multiplexing systems, offering a flexible and efficient spectrum management, enabling the adaptive cross-connection in in-band level, and eventually realizing agile optical networks."}]}],"researcher":[{"@id":"https://cir.nii.ac.jp/crid/1420001326219694720","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"30599709"},{"@type":"NRID","@value":"1000030599709"},{"@type":"ORCID","@value":"0000-0002-0739-1556"},{"@type":"NRID","@value":"9000021439948"},{"@type":"NRID","@value":"9000021470838"},{"@type":"NRID","@value":"9000307257069"},{"@type":"NRID","@value":"9000307256523"},{"@type":"NRID","@value":"9000014593577"},{"@type":"NRID","@value":"9000409988291"},{"@type":"NRID","@value":"9000107322914"},{"@type":"NRID","@value":"9000006817729"},{"@type":"NRID","@value":"9000307256917"},{"@type":"NRID","@value":"9000006802816"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/Guo-WeiLu"}],"foaf:name":[{"@language":"ja","@value":"呂 国偉"},{"@language":"en","@value":"Lu 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