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Recent Research and Development of Optical Fiber Monitoring in Communication systems

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Photonic Sensors 2013年第4期3卷 304-313页

作者： Kunihiro TOGE Fumihiko ITO ntt Access network service systems laboratories NTT Corporation Tsukuba Ibaraki 305-0805 Japan

Recent progress on optical fiber monitoring in the optical communication systems is reviewed along with current optical fiber monitoring and diagnosing problems in deployed access, trunk and submarine communication sy... 详细信息

关键词： Optical fiber monitoring diagnosis PON monitoring OFDR OTDR

Proposal of Rip-up &Re-allocate Algorithm for Optical Layer-2 Switch network

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光子学报 2014年第7期43卷 34-41页

作者： Masahiro NAKAGAWA Kyota HATTORI Naoki KIMISHIMA Masaru KATAYAMA Akira MISAWA ntt network service systems laboratories NTT Corporation

We are developing an optical layer-2s witch network that uses both wavelength-division multiplexing and time-division multiplexing technologies for efficient traffic aggregation in metro *** efficient traffic aggregation,path bandwidth control is key because it strongly affects bandwidth *** this paper,we propose a dynamic time-slot allocation method that uses periodic information of difference values of traffic *** method can derive near-optimal allocation with lower computational cost,which enlarges the maximum available network size compared with conventional time-slot allocation *** results show that the proposed method enables dynamic path control in 1K-node-scale optical layer-2s witch network,which leads to cost-effective metro networks.

关键词：交通聚集技术地铁网络成本效益交通管理

Recent Research Progress in λ-Tunable WDM/TDM-PON

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光子学报 2014年第3期43卷 1-8页

作者： Tomoaki YOSHIDA ntt Access network service systems laboratories NTT Corporation

This paper describes the current research status of theλ-tunable Wavelength-Division Multiplexing/Time-Division-Multiplexing-Passive Optical network(WDM/TDM-PON). This optical access system realizes new cost-effective operations from the network operator′s point of *** main feature of the proposed system is that it aggressively exploits wavelength *** classify the system configurations and ***,we describe key technologies,namely newly developedλ-tuning burst-mode transceivers and a widely applicable Dynamic Wavelength and Bandwith Allocation(DWBA)***,we summarize our research and discuss several issues related to the λ-tunable Wavelength-Division Multiplexing/Time-Division-MultiplexingPassive Optical network(WDM/TDM-PON).

关键词：摘要编辑部编辑工作读者

A Simplified Numerical Simulation Method Considering Active Devices for Opto-Electronic Mixed Modules

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光学学报 2003年第S1期23卷 321-322页

作者： Tomoaki Yoshida Hideaki Kimura Shuichiro Asakawa Akira Ohki Kiyomi Kumozaki ntt Access network service systems laboratories NTT CorporationNTT Access Network Service Systems Laboratories NTT CorporationNTT Photonics Laboratories NTT Corporation. 11-6 Nakase Mihamaku Chiba-shi Chiba Japan 261-0023.NTT Photonics Laboratories NTT Corporation. 11-6 Nakase Mihamaku Chiba-shi Chiba Japan 261-0023.NTT Access Network Service Systems Laboratories NTT Corporation

A simplified simulation method based on the FDTD technique that can handle active devices is proposed. This method well suits the electrical crosstalk analysis of multi-channel integrated, opto-electronic mixed modules. We apply this method to an 8-channel integrated super-compact high-sensitivity optical module. The results show good agreement between simulations and measurements.

关键词：口口 of In FDTD as be by for A Simplified Numerical Simulation Method Considering Active Devices for Opto-Electronic Mixed Modules

Low-Driving-Voltage Optical Modulation Utilizing FWM for High-Speed Transmission systems

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光学学报 2003年第S1期23卷 562-563页

作者： Akihiko Matsuura Toshiya Matsuda Tomoyoshi Kataoka ntt network service systems laboratories 1-1 Hikarinooka Yokosuka-Shi Kanagawa 239-0847 JapanNTT Network Service Systems Laboratories 1-1 Hikarinooka Yokosuka-Shi Kanagawa 239-0847 JapanNTT Network Service Systems Laboratories 1-1 Hikarinooka Yokosuka-Shi Kanagawa 239-0847 Japan

We propose an optical transmitter with reduced modulator driving voltage. This reduction is achieved through an on-off ratio improvement technique based on FWM. We confirmed the feasibility of the method in a 43-Gbit/... 详细信息

关键词： FWM on in for Low-Driving-Voltage Optical Modulation Utilizing FWM for High-Speed Transmission systems

Recent Progress of Photonic Crystal Fibers

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光学学报 2003年第S1期23卷 29-30页

作者： Katsusuke Tajima ntt Access network service systems laboratories 1 -7-1 Hanabatake Tsukuba Ibaraki Japan

Photonic crystal fibers are attractive since we can realize a wide variety of unique features in the PCFs, which cannot be realized in conventional single-mode fibers. We describe recent progress in the PCF.

关键词： PCF mode of Recent Progress of Photonic Crystal Fibers

Safety Guide-Line and Requirements for Distributed Raman Amplification and its Applications to WDM Transmission systems

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光学学报 2003年第S1期23卷 556-557页

作者： Masahito Tomizawa Akira Hirano Yutaka Miyamoto ntt network Innovation laboratories NTT Corporation 1-1 Hikari-no-oka Yokosuka 239-0847 JapanNTT Network Innovation Laboratories NTT Corporation 1-1 Hikari-no-oka Yokosuka 239-0847 JapanNTT Network Innovation Laboratories NTT Corporation 1-1 Hikari-no-oka Yokosuka 239-0847 Japan

This paper discusses optical safety issues in distributed Raman amplification systems. Given the extremely high pump powers, network service operators have critical issues for safety. This paper focuses on both " eye-... 详细信息

关键词： for it on high In be of Safety Guide-Line and Requirements for Distributed Raman Amplification and its Applications to WDM Transmission systems APR into

Broadband IP Stream Transmission Experiments over Global and Long Distance networks

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光学学报 2003年第S1期23卷 527-528页

作者： Kimio Oguchi Tetsuro Fujii Atsushi Takahara Toshiaki Miyazaki Kazuo Hagimoto Sadayasu Ono ntt network Innovation laboratories 1-1 Hikari-no-oka Yokosuka 239-0847 JapanNTT Network Innovation Laboratories 1-1 Hikari-no-oka Yokosuka 239-0847 JapanNTT Network Innovation Laboratories 1-1 Hikari-no-oka Yokosuka 239-0847 JapanNTT Network Innovation Laboratories 1-1 Hikari-no-oka Yokosuka 239-0847 JapanNTT Network Innovation Laboratories 1-1 Hikari-no-oka Yokosuka 239-0847 JapanNTT Network Innovation Laboratories 1-1 Hikari-no-oka Yokosuka 239-0847 Japan

Super High Definition (SHD) movies were successfully transmitted as streaming contents at about 300 Mbps for the first time over a long distance IP network (more than 3,000 km), in conjunction with the experimental ve... 详细信息

关键词： IP on over Broadband IP Stream Transmission Experiments over Global and Long Distance networks

Photonic MPLS network Technologies to Create Bandwidth-Abundant IP networks

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光学学报 2003年第S1期23卷 665-666页

作者： Atsushi Watanabe ntt network Innovation laboratories NTT Corporation 1-1 Hikari-no-oka Yokosuka Kanagawa Japan.

This paper describes the prototypes of the Photonic MPLS router that can create bandwidth-abundant IP networks in a cost-effective manner. The characteristics of and recent advances in these prototypes are also descri... 详细信息

关键词： MPLS on et in OLSP Photonic MPLS network Technologies to Create Bandwidth-Abundant IP networks IP