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Growth and low-energy electron microscopy characteri- zation of monolayer hexagonal boron nitride on epitaxial cobalt

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Nano Research 2013年第5期6卷 335-347页

作者： Carlo M. Orofeo Satoru Suzuki Hiroyuki Kageshima Hiroki Hibino ntt Basic Research Laboratories NTT Corporation A tsugi Kanagawa 243-0198 Japan

Low-energy electron microscopy （LEEM） has been used to study the structure, initial growth orientation, growth progression, and the number of layers of atomically thin hexagonal boron nitride （h-BN） films. The h-BN films are grown on heteroepitaxial Co using chemical vapor deposition （CVD） at low pressure. Our findings from LEEM studies include the growth of monolayer film having two, oppositely oriented, triangular BN domains commensurate with the Co lattice. The growth of h-BN appears to be self-limiting at a monolayer, with thicker domains only appearing in patches, presumably initiated between domain boundaries. Reflectivity measurements of the thicker h-BN films show oscillations resulting from the resonant electron transmission through quantized electronic states of the h-BN films, with the number of minima scaling up with the number of h-BN layers. First principles density functional theory （DFT） calculations show that the positions of oscillations are related to the electronic band structure of h-BN.

关键词： chemical vapor deposition cobalt domain boundaries hexagonal boron nitride low-energy electronmicroscopy (LEEM)

New Test Light Spectrum Design for L/U-Band Extended Optical Fiber Line Testing System

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光学学报 2003年第S1期23卷 57-58页

作者： Nazuki Honda Noriyuki Araki Hisashi Izumita Minoru Nakamura ntt Access Network Service Systems Laboratories NTT Corporation JapanNTT Access Network Service Systems Laboratories NTT Corporation JapanNTT Access Network Service Systems Laboratories NTT Corporation JapanNTT Access Network Service Systems Laboratories NTT Corporation Japan

This paper describes a new design for the test light source of an L/U-band extended optical fiber line testing system and the side-band suppresser ratio of the test light should be more than 70 dB.

关键词： FBG nm test New Test Light Spectrum Design for L/U-Band Extended Optical Fiber Line Testing System for

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

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

Influence of Zn Diffusion on Bandwidth and Extinction in MQW Electroabsorption Modulators Buried with Semi-Insulating InP

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光学学报 2003年第S1期23卷 439-440页

作者： Takayuki Yamanaka Hideki Fukano Ken Tsuzuki Munehisa Tamura Ryuzo Iga Matsuyuki Ogasawara Yasuhiro Kondo Tadashi Saitoh ntt Photonics Laboratories NTT Corporation 3-1 Morinosato Wakamiya Atsugi Kanagawa 243-0198 JAPANNTT Photonics Laboratories NTT Corporation 3-1 Morinosato Wakamiya Atsugi Kanagawa 243-0198 JAPANNTT Photonics Laboratories NTT Corporation 3-1 Morinosato Wakamiya Atsugi Kanagawa 243-0198 JAPANNTT Photonics Laboratories NTT Corporation 3-1 Morinosato Wakamiya Atsugi Kanagawa 243-0198 JAPANNTT Photonics Laboratories NTT Corporation 3-1 Morinosato Wakamiya Atsugi Kanagawa 243-0198 JAPANNTT Photonics Laboratories NTT Corporation 3-1 Morinosato Wakamiya Atsugi Kanagawa 243-0198 JAPANNTT Photonics Laboratories NTT Corporation 3-1 Morinosato Wakamiya Atsugi Kanagawa 243-0198 JAPANNTT Photonics Laboratories NTT Corporation 3-1 Morinosato Wakamiya Atsugi Kanagawa 243-0198 JAPAN

A comprehensive analysis of multi-quantum-well electroabsorption modulators buried with semi-insulating (SI)-InP is presented. We quantitatively demonstrate that suppression of Zn diffusion into the burying and optica... 详细信息

关键词： MQW Influence of Zn Diffusion on Bandwidth and Extinction in MQW Electroabsorption Modulators Buried with Semi-Insulating InP Zn EAM in with of on

FDNet:A Deep Learning Approach with Two Parallel Cross Encoding Pathways for Precipitation Nowcasting

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Journal of Computer Science & Technology 2023年第5期38卷 1002-1020页

作者：闫碧莹杨超陈峰 Kohei Takeda Changjun Wang University of Chinese Academy of Sciences Beijing 100049China Institute of Software Chinese Academy of SciencesBeijing 100190China School of Mathematical Sciences Peking UniversityBeijing 100871China Peng Cheng Laboratory Shenzhen 518052China Guiyang Academy of Information Technology Guiyang 550081China ntt data corporation Tokyo 163-8001Japan ntt data Institute of Management Consulting Inc. Tokyo 163-8001Japan

With the goal of predicting the future rainfall intensity in a local region over a relatively short period time,precipitation nowcasting has been a long-time scientific challenge with great social and economic *** radar echo extrapolation approaches for precipitation nowcasting take radar echo images as input,aiming to generate future radar echo images by learning from the historical *** effectively handle complex and high non-stationary evolution of radar echoes,we propose to decompose the movement into optical flow field motion and morphologic *** this idea,we introduce Flow-Deformation Network(FDNet),a neural network that models flow and deformation in two parallel cross *** flow encoder captures the optical flow field motion between consecutive images and the deformation encoder distinguishes the change of shape from the translational motion of radar *** evaluate the proposed network architecture on two real-world radar echo *** model achieves state-of-the-art prediction results compared with recent *** the best of our knowledge,this is the first network architecture with flow and deformation separation to model the evolution of radar echoes for precipitation *** believe that the general idea of this work could not only inspire much more effective approaches but also be applied to other similar spatio-temporal prediction tasks.

关键词： spatio-temporal predictive learning precipitation nowcasting neural network

A Spectral-Mode-Splitting Scheme for CSRZ and CSRZ-DPSK Signal Transmission

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光学学报 2003年第S1期23卷 595-596页

作者： Akira Hirano Yutaka Miyamoto Shoichiro Kuwahara ntt Network Innovation Labs. NTT Corporation Hikarino-oka 1-1 Yokosuka Kanagawa JAPANNTT Network Innovation Labs. NTT Corporation Hikarino-oka 1-1 Yokosuka Kanagawa JAPANNTT Network Innovation Labs. NTT Corporation Hikarino-oka 1-1 Yokosuka Kanagawa JAPAN

We propose a spectral-mode-splitting scheme and how it can be applied to CSRZ and CSRZ-DPSK signal formats, and show that it provides both accurate chromatic dispersion detection in CSRZ application and robustness aga... 详细信息

关键词： CSRZ it DPSK NRZ for

Strictly Transparent Wavelength Conversion Using Multi-Wavelength Signal Generation

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光学学报 2003年第S1期23卷 351-352页

作者： Eiichi Yamada Hiroaki Sanjoh Yuzo Yoshikuni ntt Photonics Laboratories NTT Corporation 3-1 Morinosato Wakamiya Atsugi Kanagawa 243-0198 JapanNTT Photonics Laboratories NTT Corporation 3-1 Morinosato Wakamiya Atsugi Kanagawa 243-0198 JapanNTT Photonics Laboratories NTT Corporation 3-1 Morinosato Wakamiya Atsugi Kanagawa 243-0198 Japan

We succeeded in strictly transparent wavelength conversion by means of channel selection from multi-wavelength signals generated by sinusoidal modulation of input signal. Modulation-format-independent and bit-rate-ind... 详细信息

关键词： that in rate were mode of NRZ from AWG Figure

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