NDLI: Development of Japanese scientific cable technology

Content Provider	IEEE Xplore Digital Library
Author	Mikada, H. Asakawa, K.
Copyright Year	2008
Description	Author affiliation: Dept. Civil and Earth Resources Eng., Kyoto University, DaigakuKatsura, Nishikyoku, 6158540 Japan (Mikada, H.) \|\| Marine Technology Center, Japan Agency for MarineEarth Science and Technology (JAMSTEC), Natsushimacho, Yokosukashi, Kanagawa, 2370061 Japan (Asakawa, K.)
Abstract	Japanese ocean science community has installed eight cabled observatories in Japanese water in the past. Japan started installing cabled observatories in the middle of 1970's for disaster mitigation as countermeasure to possible megathrust earthquake in the Tokai region, about 100 km away from Tokyo. Their first system composed of metal wires used frequency modulated signal transmission for carrying data acquired on the seafloor to land. The first Japanese cabled observatory was installed in 1978, i.e., five years after the initiation of engineering development. Since 1990, all newly installed cabled observatories have used fiber optic communication lines following the technological development in the telecom industry. Obviously, the development of scientific cabled observations adjusted their stride with that in the industry. Since the major telecom cables have been installed in a pointtopoint configuration, scientific cabled observatories have been developed in the same way. In general, they have a land station and a line of cable along which observational instruments or junction boxes are connected inline in the place of repeaters. Recently, scientists started trying to expand their observations in a way to enhance observational capabilities using multidisciplinary sensors as the growth of their understanding to invisible processes in the sea. Cabled observatory projects are now underway to enable nextstep data acquisition on the seafloor with much wider spatial coverage and dense observational instruments. Technological development from a pointtopoint configuration to a network, whose topology could be either ring or star shape, has become necessary. Power supply and communication mechanisms to all of sensors attached to observatory need to be revisited as well.
Starting Page	1
Ending Page	4
File Size	1772161
Page Count	4
File Format	PDF
ISBN	9781424426195
DOI	10.1109/OCEANS.2008.5289426
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-09-15
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical fiber cables Observatories Communication cables Sea floor Telecommunications Instruments Marine technology Oceans Earthquakes Wires
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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