The Birth of Japanese Optical Transmission System and Evolution Thereafter
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Accession number;04A0345739
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| Title;The Birth of Japanese Optical Transmission System and Evolution Thereafter |
| Author;
TAKASHIMA SEIJI
(Kyowa Exeo Corp., JPN)
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Journal Title;ITU Janaru
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Journal Code:L0766A
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ISSN:0916-7544
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VOL.34;NO.5;PAGE.46-49(2004)
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| Figure&Table&Reference; |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;The author has been involved in development of Japanese optical communication technology since its beginning. While millimeter wavelength waveguide, super conductive coaxial cable etc. were studied as the new generation communication lines, optical communication emerged as another candidate. But in early '70s, both laser diodes and optical fibers were not reliable. It was in 1977 that NTT decided to develop optical communications truly and after that, the world entered international development competition era. The NTT's direction of development for practical application changed from technology piling-up to purpose preceding. Since then, starting with FR-1 system (with 20.8km experimental transmission length, multimode fiber and 32Mbps transmission rate), FR-400 system realized traveling through Japan islands. Then, NTT moved to INS framework, B-ISDN framework, and YI&P framework, and now is engaged in FTTH. |
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