The Experts below are selected from a list of 474 Experts worldwide ranked by ideXlab platform
W C Marra - One of the best experts on this subject based on the ideXlab platform.
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applying wdm technology to Undersea Cable networks
IEEE Communications Magazine, 1998Co-Authors: Patrick R Trischitta, W C MarraAbstract:WDM technology is now being applied to international Undersea fiber optic Cable networks in order to provide enhancements such as increased network capacity and greater network flexibility. This article looks at what WDM technology can provide, the progress being made, and the special challenges in its application in Undersea networks. We then describe several international Undersea networks that, when completed by the end of 1999, will use WDM technology and will serve as a major part of the global Undersea fiber optic infrastructure connecting the world.
Patrick R Trischitta - One of the best experts on this subject based on the ideXlab platform.
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applying wdm technology to Undersea Cable networks
IEEE Communications Magazine, 1998Co-Authors: Patrick R Trischitta, W C MarraAbstract:WDM technology is now being applied to international Undersea fiber optic Cable networks in order to provide enhancements such as increased network capacity and greater network flexibility. This article looks at what WDM technology can provide, the progress being made, and the special challenges in its application in Undersea networks. We then describe several international Undersea networks that, when completed by the end of 1999, will use WDM technology and will serve as a major part of the global Undersea fiber optic infrastructure connecting the world.
J B Thomine - One of the best experts on this subject based on the ideXlab platform.
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optical Undersea Cable systems trends
Proceedings of the IEEE, 1993Co-Authors: J Thiennot, F Pirio, J B ThomineAbstract:This paper reviews the evolution of Undersea Cable technology from the telegraph Cables of the mid-nineteenth century to the optical Undersea Cables of today. Future systems will use optical fiber amplifiers which offer significant technical and economic advantages. Consequently, emphasis is placed on problems associated with the accumulation of small, second-order effects in long lengths of optical fiber and, specifically, their impact on the 5-Gb/s optically amplified transoceanic Undersea systems scheduled to be deployed in 1995. Technology options for achieving further capacity increases, among them the use of optical solitons, and trends toward networked Undersea Cable systems with automatic restoration features are described. >
Yuichi Shirasaki - One of the best experts on this subject based on the ideXlab platform.
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Installation of the multi-disciplinary VENUS observatory at the Ryukyu Trench using Guam-Okinawa geophysical submarine Cable
2015Co-Authors: J Kasahara, Ryoichi Iwase, Katsuyoshi Kawaguchi, Yuichi ShirasakiAbstract:Abstract. A multi-disciplinary VENUS (Versatile Eco-monitoring Network by Undersea-Cable System) observatory was installed at the depth of 2,170 meters on the slope of the Ryukyu Trench. It equips seven geophysical instrument groups. Prior to the installation of the VENUS multi-disciplinary ocean bottom (MDOBO) observatory, an ocean-bottom telemetry system, which has functions to supply electrical power to the MDOBO, and the submarine coaxial Cable were installed at ocean bottom. The installation of the multi-disciplinary ocean bottom observatory was done by use of deep-towing unit and ROV Kaiko-10K. During the period of August- September 1999, seven instrument groups of MDOBO were deployed at the target position, at 80-1000 meter distances from the telemetry system, with several meters allowances using a deep-towing unit. To install the instrument at the exact location, the mother ship of deep-towing unit was precisely navigated. The extension Cables were also dropped from the deep-towing unit. The ROV Kaiko-10K extended multi-conductor extension Cables from instrument units towards the ocean-bottom telemetry system and connected them to Undersea mateable connectors on the junction box. The MDOBO collected one and half month records. Some useful data were observed since the installation. 1
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an experimental multi disciplinary observatory venus at the ryukyu trench using the guam okinawa geophysical submarine Cable
Annals of Geophysics, 2006Co-Authors: J Kasahara, Ryoichi Iwase, Tadashi Nakatsuka, Y Nagaya, Yuichi Shirasaki, Katsuyoshi Kawaguchi, J KojimaAbstract:A MultiDisciplinary Ocean Bottom Observatory (MDOBO) was installed on VENUS (Versatile Eco-monitor- ing Network by Undersea-Cable System) at a depth of 2170 m on the slope of the Ryukyu Trench. In this con- text, «Eco-»refers to both economic (e.g., earthquake hazard mitigation) and ecological motivation. The first step in this instillation was to insert a telemetry/power system into the submarine coaxial Cable; this system could then service the MDOBO, which consists of seven major bottom sensor packages. During August-Sep- tember 1999, using a deep-towed unit and both manned and unmanned submersibles coupled with precise ship navigation, the MDOBO system and its attendant Cables were deployed over a range of distances from 80 m to 1 km from the telemetry system, with several meters allowance for navigational uncertainty in positioning. The unmanned submersible then extended the multi-conductor extension Cables from the instrument units toward the telemetry system and connected them to Undersea mateable connectors on a junction box installed on the submarine Cable. The MDOBO collected one and half months of continuous records. Several kinds of useful data were collected after installation, including an aftershock (Ms= 6.1) of the 1999 Chi-Chi earthquake (Ms= 7.7) in Taiwan.
J Kasahara - One of the best experts on this subject based on the ideXlab platform.
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Installation of the multi-disciplinary VENUS observatory at the Ryukyu Trench using Guam-Okinawa geophysical submarine Cable
2015Co-Authors: J Kasahara, Ryoichi Iwase, Katsuyoshi Kawaguchi, Yuichi ShirasakiAbstract:Abstract. A multi-disciplinary VENUS (Versatile Eco-monitoring Network by Undersea-Cable System) observatory was installed at the depth of 2,170 meters on the slope of the Ryukyu Trench. It equips seven geophysical instrument groups. Prior to the installation of the VENUS multi-disciplinary ocean bottom (MDOBO) observatory, an ocean-bottom telemetry system, which has functions to supply electrical power to the MDOBO, and the submarine coaxial Cable were installed at ocean bottom. The installation of the multi-disciplinary ocean bottom observatory was done by use of deep-towing unit and ROV Kaiko-10K. During the period of August- September 1999, seven instrument groups of MDOBO were deployed at the target position, at 80-1000 meter distances from the telemetry system, with several meters allowances using a deep-towing unit. To install the instrument at the exact location, the mother ship of deep-towing unit was precisely navigated. The extension Cables were also dropped from the deep-towing unit. The ROV Kaiko-10K extended multi-conductor extension Cables from instrument units towards the ocean-bottom telemetry system and connected them to Undersea mateable connectors on the junction box. The MDOBO collected one and half month records. Some useful data were observed since the installation. 1
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an experimental multi disciplinary observatory venus at the ryukyu trench using the guam okinawa geophysical submarine Cable
Annals of Geophysics, 2006Co-Authors: J Kasahara, Ryoichi Iwase, Tadashi Nakatsuka, Y Nagaya, Yuichi Shirasaki, Katsuyoshi Kawaguchi, J KojimaAbstract:A MultiDisciplinary Ocean Bottom Observatory (MDOBO) was installed on VENUS (Versatile Eco-monitor- ing Network by Undersea-Cable System) at a depth of 2170 m on the slope of the Ryukyu Trench. In this con- text, «Eco-»refers to both economic (e.g., earthquake hazard mitigation) and ecological motivation. The first step in this instillation was to insert a telemetry/power system into the submarine coaxial Cable; this system could then service the MDOBO, which consists of seven major bottom sensor packages. During August-Sep- tember 1999, using a deep-towed unit and both manned and unmanned submersibles coupled with precise ship navigation, the MDOBO system and its attendant Cables were deployed over a range of distances from 80 m to 1 km from the telemetry system, with several meters allowance for navigational uncertainty in positioning. The unmanned submersible then extended the multi-conductor extension Cables from the instrument units toward the telemetry system and connected them to Undersea mateable connectors on a junction box installed on the submarine Cable. The MDOBO collected one and half months of continuous records. Several kinds of useful data were collected after installation, including an aftershock (Ms= 6.1) of the 1999 Chi-Chi earthquake (Ms= 7.7) in Taiwan.
