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About RIEC Introduction Message from the Director Principles, Missions, Objectives Institute Vision Organization People, Land and Buildings, Budgets History Chronology International Activities COE of International Research Collaboration How to study at RIEC Organization Computing System Platforms Division Solid State Electronics Dielectric Nano-Devices Materials Functionality Design Spintronics Nano-Integration Devices and Systems Quantum Devices Innovative Spintronic Device Computing Information Theory New Paradigm VLSI System Information Communication Platforms Division Ultrahigh-Speed Optical Communication Group Applied Quantum Optics Group Advanced Wireless Information Technology Information Storage Systems Ultra-Broadband Signal Processing Quantum-Optical Information Technology Network Architecture Environmentally Conscious Secure Information System Human and Bio Information Systems Division Electromagnetic Bioinformation Engineering Advanced Acoustic Information Systems Visual Cognition and Systems Realｰworld computing Nano-Bio Hybrid Molecular Devices Interactive Content Design Soft Computing Integrated System Research Facilities Laboratory for Nanoelectronics and Spintronics Laboratory for Brainware Systems Research Center for 21st Century Information Technology（IT-21 Center） Common Research Facilities Flexible Information System Center Fundamental Technology Center Management Office for Safety and Health Promotion Office Ad-hoc research groups Co-creation Research Center Furukawa Electric x Tohoku Univ. Co-creation Research Center for Photonics Integration Staff Cooperative Research About RIEC Cooperative Research Projects Public Invitation RIEC Nation-wide Application System List of Research Projects Description of acknowledgment RIEC Annual Meeting FY2023 RIEC Annual Meeting FY2022 RIEC Annual Meeting International Exchange International Activities COE of International Research Collaboration Information What’s New Award News Press Release Event RIEC Annual Meeting Projects Type-T (Study Groups on Electrical Communication) Lecture Symposiums Nation-wide Cooperative Study Group Archives RIEC NEWS WEB Latest version of the Archives RIEC, Tohoku University : Back number Annual Report of RIEC : Back Number RIEC NEWS Back Number Other Call For Proposals RIEC Administrative Office (Japanese Website) Educational Activities 日本語 English About RIEC Introduction Message from the Director Principles, Missions, Objectives Institute Vision Organization People, Land and Buildings, Budgets History Chronology International Activities COE of International Research Collaboration How to study at RIEC Organization Computing System Platforms Division Solid State Electronics Dielectric Nano-Devices Materials Functionality Design Spintronics Nano-Integration Devices and Systems Quantum Devices Innovative Spintronic Device Computing Information Theory New Paradigm VLSI System Information Communication Platforms Division Ultrahigh-Speed Optical Communication Group Applied Quantum Optics Group Advanced Wireless Information Technology Information Storage Systems Ultra-Broadband Signal Processing Quantum-Optical Information Technology Network Architecture Environmentally Conscious Secure Information System Human and Bio Information Systems Division Electromagnetic Bioinformation Engineering Advanced Acoustic Information Systems Visual Cognition and Systems Realｰworld computing Nano-Bio Hybrid Molecular Devices Interactive Content Design Soft Computing Integrated System Research Facilities Laboratory for Nanoelectronics and Spintronics Laboratory for Brainware Systems Research Center for 21st Century Information Technology（IT-21 Center） Common Research Facilities Flexible Information System Center Fundamental Technology Center Management Office for Safety and Health Promotion Office Ad-hoc research groups Co-creation Research Center Furukawa Electric x Tohoku Univ. Co-creation Research Center for Photonics Integration Staff Cooperative Research About RIEC Cooperative Research Projects Public Invitation RIEC Nation-wide Application System List of Research Projects Description of acknowledgment RIEC Annual Meeting FY2023 RIEC Annual Meeting FY2022 RIEC Annual Meeting International Exchange International Activities COE of International Research Collaboration Information What’s New Award News Press Release Event RIEC Annual Meeting Projects Type-T (Study Groups on Electrical Communication) Lecture Symposiums Nation-wide Cooperative Study Group Archives RIEC NEWS WEB Latest version of the Archives RIEC, Tohoku University : Back number Annual Report of RIEC : Back Number RIEC NEWS Back Number Other Call For Proposals RIEC Administrative Office (Japanese Website) Educational Activities 日本語 English Ultrahigh-Speed Optical Communication Group HOME > Research Activities > Information Communication Platforms Division > Ultrahigh-Speed Optical Communication Group &＃62;&＃62; Information Communication Platforms Division Ultrahigh-Speed Optical Communication Group Researcher [ Professor ]Toshihiko Hirooka [ Associate Professorsor ]Keisuke Kasai Group Web Site http://www.hikari.riec.tohoku.ac.jp/index-en.html Research Activities Optical communication systems have evolved as a core technology of the ICT infrastructure and become widely used in society. This widespread deployment has been enabled by the progress made on light sources, transmission media, and signal processing, and by taking advantage of their high-speed and broadband operation. In the future, further innovation is expected that will realize flexible communication links capable of accommodating massive increases in the amount of information at any time, and transmitting it anywhere, and between any devices. In this laboratory, we aim at establishing ultrahigh-speed, large-capacity, highly secure and resilient optical communication technologies that can even be integrated with wireless communication by taking ultimate advantage of the coherence of lightwaves. We also intend to develop functional optical systems capable of handling such transmissions with extremely high energy efficiency. Optical Signal Processing (Assoc. Prof. Hirooka) Research topics Ultrahigh-speed and highly efficient optical transmission and signal processing Digital coherent optical communication and its application to optical mobile fronthaul In this group, we are engaged in research on ultrahigh-speed optical transmission using optical time division multiplexing with a single-channel Tbit/s-class capacity, digital coherent QAM optical transmission, and high-speed and spectrally efficient optical transmission by combining these two approaches. With a view to supporting innovative new ICT services such as 5G and IoT, our goal is also to apply digital coherent transmission to access networks and mobile fronthaul, and to develop novel transmission schemes integrating optical and wireless communications through an electromagnetic wave, and optical measurements and functionalities taking full advantage of coherence. Experiment on ultrahigh-speed optical transmission Lightwave Control System (Assoc. Prof. Kasai) Research topics Optical phase control techniques and their application to digital coherent optical communication Frequency-stabilized lasers and their application to precise optical interferometric measurement systems In this field, we are engaged in research on precise optical phase control technologies such as optical phase-locked loop and optical injection-locking, and digital coherent multilevel optical transmission system by employing these technologies. Furthermore, we are studying an absolute frequency-stabilized laser at 1.5 ?m and its application to high precision optical interferometric measurement systems. 2048 QAM coherent optical signal (left) and cross section of 19-core fiber (right) Related Videos 研究室のようすThe state of the research About RIEC Message from the Director Principles, Missions, Objectives Institute Vision Organization People, Land and Buildings, Budgets Chronology How to study at RIEC Cooperative Research About RIEC Cooperative Research Projects Public Invitation RIEC Nation-wide Cooperative Research Projects System Description of acknowledgment Information What’s New Archives Link Call For Proposals Link Access Contact Us Sitemap Organization Computing System Platforms Division Information Communication Platforms Division Human and Bio Information Systems Division Research Facilities Common Research Facilities Ad-hoc research groups International Exchange International Activities COE of International Research Collaboration RIEC public relations RIEC Newsweb RIEC Youtube Channel RIEC People 東北大学電気通信研究所Research Institute of Electrical Communication Tohoku University 〒980-8577 宮城県仙台市青葉区片平２丁目１−１2-1-1 Katahira, Aoba-ku, Sendai 980-8577, JAPAN © 2019 Research Institute of Electrical Communication Tohoku University All Rights Reserved.