![]() ![]() M.Nakahara, N.Ingaki, K.Yoshida, M.Yoshida, O.Fukuda, “Fabrication of 100-km graded-index fiber from a continuously consolidated VAD perform,” Proc. T.Edahiro, S.Takahashi, K.Yoshida, M.Yoshida, and T.Shioda, “Long single-mode fiber made by vapor-phase axial deposition,” Proc. Inagaki, “Materials and Processes for Fiber Preform Fabrication-Vapor-Phase Axial Deposition,” Proc. Kawachi, and M.Nakahara, “Fabrication of Completely OH-FREE V.A.D Fibre,” Electon. Hanawa, “Continuous Fabrication Process for High-Silica Fiber Preforms,” IECE of Japan, Vol.E-62, No.11, 1980. Takeda, “Optical attenuation in pure and doped fused silica in the IR wavelength region,” Applied Phys. Integrated Optics and Optical Fiber Commun., 375, 1977. Hanawa, “Continuous fabrication of high silica fiber preform”, Int. The fact that the VAD method does not need a collapsing process enables the continuous fabrication of a glass preform, which is preferable for the low cost mass production of optical fiber. By contrast, other glass preform fabrication methods such as modified chemical vapor deposition (MCVD) and outside vapor deposition (OVD) require a collapsing process before they can prepare a transparent glass preform for fiber drawing. The porous glass is successively consolidated into a transparent glass preform for the fiber drawing process by arranging the melting zone region at the upper position in the axial direction. The starting rod is pulled upward, and the porous preform is grown in the axial direction. With the VAD method, the porous glass preform is fabricated by the deposition of fine glass material via flame hydrolysis onto the end surface of a starting silica glass rod used as a seed. ![]() The VAD method has contributed to the building of optical telecommunication networks that support our advanced information and communication society.įeatures that set this work apart from similar achievements The VAD method is currently the most used optical fiber fabrication method and accounts for more than 50% of the optical fiber used for telecommunications. The invention of the VAD method and the collaborative work to improve the process undertaken by NTT and the three electric wire and cable manufacturers established the basis for the low-cost mass production of high-quality low-loss optical fiber. Tatsuo Izawa invented the vapor-phase axial deposition (VAD) method for fabricating optical fiber preforms that were highly suitable for the mass production of optical fiber. All visitors have free access to this hall.įrom 1975 to 1983, NTT and three Japanese electric wire and cable manufacturers (Furukawa Electric, Sumitomo Electric, and Fujikura) worked collaboratively on the research and development of optical fiber for telecommunication. The plaque will be placed near the reception area at the floor entrance hall. NTT’s receptionists are always near the plaque. How the intended plaque site is protected/secured It will be displayed in a transparent hard case. Street address(es) and GPS coordinates of the Milestone Plaque Sitesģ-1 Morinosato Wakamiya, Atsugi-shi, Kanagawa, 243-0198 Japan.ĭetails of the physical location of the plaque The VAD method contributed greatly to the construction of optical-fiber networks. The technology successfully shifted from research and development to commercialization. NTT, Furukawa Electric, Sumitomo Electric, and Fujikura collaboratively investigated the fabrication process. (NTT) invented the vapor-phase axial deposition (VAD) method suitable for the mass production of optical fiber. Tatsuo Izawa of Nippon Telegraph and Telephone Corp. Vapor-phase Axial Deposition Method for Mass Production of High-quality Optical Fiber, 1977-1983 7 Features that set this work apart from similar achievements.5 How the intended plaque site is protected/secured. ![]() 4 Details of the physical location of the plaque.3 Street address(es) and GPS coordinates of the Milestone Plaque Sites. ![]()
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