廣岡 俊彦教授光通信システムは、光源、伝送媒体、信号処理技術の発展に支えられ、その高速性・広帯域性を活用し、ICTインフラの中核的基盤技術として発展を遂げ社会に浸透している。今後、爆発的に増大し続ける情報を、いつでもどこへでも何にでも自在につなぐ柔軟な通信技術としてのさらなるイノベーションが求められている。本研究室は、光のコヒーレンスを極限まで活用し、無線通信との融合をも可能とする、超高速・超大容量でセキュア且つレジリエントな新世代光通信技術、およびそれらを極めて高いエネルギー効率で実現しうる光機能システムの開拓を目指している。本研究分野では、光時分割多重方式による1チャネルあたりTbit/s級の超高速光伝送、QAMと呼ばれるデジタルコヒーレント光伝送、ならびにそれらを融合した超高速・高効率光伝送技術の研究開発を進めている。また、5G、IoT等の新たなICTサービスの進展を見据えて、デジタルコヒーレント伝送のアクセスネットワークおよびモバイルフロントホールへの展開と、光通信と無線通信とを同じ電磁波として融合する新領域の開発、ならびにコヒーレンスを極限まで活用した計測応用と光機能システムの創出を目指している。本研究分野では光位相同期ループや光注入同期といった高精度な光波位相制御技術とこれを用いたデジタルコヒーレント多値光伝送技術の研究開発に取り組んでいる。また、波長1.5µm帯における絶対周波数安定化レーザとその高精度光干渉計測ヘの応用に関する研究を進めている。超高速光通信実験の様子Experiment on ultrahigh-speed optical transmission葛西 恵介准教授2048 QAMコヒーレント光信号（左）および19コアファイバの断面写真（右）2048 QAM coherent optical signal (left) and cross section of 19-core fiber (right)Optical communication systems have evolved as a core technol-ogy 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 process-ing, 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 lab-oratory, we aim at establishing ultrahigh-speed, large-capacity, highly secure and resilient optical communication technologies that can even be integrated with wireless communication by tak-ing 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.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 effi-cient 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 transmis-sion 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 co-herence.In this field, we are engaged in research on precise optical phase control technologies such as optical phase-locked loop and opti-cal injection-locking, and digital coherent multilevel optical trans-mission system by employing these technologies. Furthermore, we are studying an absolute frequency-stabilized laser at 1.5 μm and its application to high precision optical interferometric mea-surement systems.Toshihiko HirookaProfessor38Keisuke KasaiAssociate ProfessorsorResearch ActivitiesUltrahigh-Speed Optical Communication (Prof. Hirooka)Lightwave Control System (Assoc. Prof. Kasai)Staff超高速光通信研究室Ultrahigh-Speed Optical Communication研究活動超高速光通信研究分野｜廣岡教授光波制御システム研究分野｜葛西准教授
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