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8Integrated ICTNetwork System Research Institute The Photonic Network System Labora-tory performs research into ultrahigh-ca-pacity multi-core fiber transmission tech-nologies and optical integrated network technologies to meet the increased de-mand for data services, which is predicted to increase by three orders of magnitude beyond current levels. The Network Science and Convergence Device Technology Laboratory performs research into (i) automation of dynamic, on-demand network configuration and control technology, and (ii) information dissemination and sharing based on infor-mation-centric networking concepts. In addition, its laboratory studies are geared towards realizing the seamless conver-gence of core networks, optical access and wireless, to provide end users with high-capacity communications.83.3 Tbit/s: a new world record in optical switchingRegarding the research and develop-ment of multi-core all-optical switching tech-nologies, we have developed a high-speed parallel switching system equipped with a controller that simultaneously drives multiple elements according to the destination signals (Fig.1), enabled by a parallel configuration of high-speed electro-absorption (EA) optical switches with a switching speed on the order of nanoseconds. Using this testbed, we have successfully tested 7-core-multiplexed optical packet switching with a world record switch-ing capacity of 53.3 Tbit/s. This result was chosen for a special session of outstanding papers (commonly referred to as Post-dead-line Papers) at the European Conference and Exhibition on Optical Communication (ECOC2017), the top conference in the field of optical communications. Later on, we made further improvements to this technology and achieved a new record switching capacity of 83.3 Tbit/s, which is 6.5 times higher than the previous record set just three years ago.159 Tbit/s Transmission over 1,045 km using standard diameter mul-timode optical fiberWe successfully demonstrated transmis-sion of 159 Tbit/s data over 1,045 km using a 3-mode optical fiber with a standard cladding diameter (0.125 mm) that is compatible with standard optical fiber infrastructure (Fig.2). Using the common metric of the product of transmission capacity and distance, this ex-periment gives a value of 166 Pbit/s·km (peta-bit kilometers), which is approximately double the existing world record for standard diam-eter optical fibers for spatial multiplexing. This result was selected for the Post-deadline spe-cial session of the Optical Fiber Communica-tion Conference (OFC2018), which is the top conference in the field of optical communica-tions.Highly integrated two-dimen-sional photodetector array We have developed a highly integrated photodetector device (Fig.3) that can de-tect and convert a large number of high-speed optical signals to the electrical sig-nals simultaneously. This device integrates 32 photodetector units in an area of ap-The Network System Research Institute promotes fundamental research and development of global and advanced network system technologies to meet the recent explosive growth in data traic and for the diversification of commu-nication quality and network service. This research aims to create a “connected society” that provides its citizens with new opportunities and revolutionizes business and social interactions.Fig.1 : Developed 7-core-joint optical switch systemResearch and Development