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International Conference on computer Application and System Modeling (ICCASM)

作者： Baoguo Meng Shuping Peng Yucheng Zhong Zhengbin Li Yongqi He Lixin Zhu Anshi Xu Zhenrong Zhang Yanmei Zhang State Key Laboratory of Advanced Optical Communication Systems & Networks Peking University Beijing China School of Computer Electronics and Information Guangxi University Nanning China School of information engineering China University of Geoscience Beijing China

ISBN: (纸本)9781424472352

Based on a multi-channel unidirectional ring network test bed, a data transmission model is established and tested. The settings and the implementation of the model are introduced in detail. Finally, the model is tested based on the test bed. The results from both the sending and the receiving transmission platforms show the data transmission model can work effectively.

关键词： IP networks Computational modeling computers

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Single-shot optical-path-length-shifting color digital holography

Single-shot optical-path-length-shifting color digital holog...

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Digital Holography and Three-Dimensional Imaging, DH 2010

作者： Kakue, Takashi Kuwamura, Mitsuo Shimozato, Yuki Tahara, Tatsuki Awatsuji, Yasuhiro Ura, Shogo Nishio, Kenzo Kubota, Toshihiro Matoba, Osamu Graduate School of Science and Technology Kyoto Institute of Technology Matsugasaki Sakyo-ku Kyoto 606-8585 Japan Advanced Technology Center Kyoto Institute of Technology Matsugasaki Sakyo-ku Kyoto 606-8585 Japan Kubota Holography Laboratory Corporation Nishihata 34-1-609 Ogura-cho Uji 611-0042 Japan Department of Computer and Systems Engineering Kobe University Rokkodai 1-1 Nada-ku Kobe 657-8501 Japan

We propose an optical-path-length-shifting digital holography with single-shot exposure for capturing three-dimensional images of color object. The proposed technique was numerically simulated and its validity was con... 详细信息

ISBN: (纸本)9781557528872

关键词： Mean square error

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Image compression emphasizing pixel size objects in midwave infrared persistent surveillance systems

Image compression emphasizing pixel size objects in midwave ...

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IEEE National Conference on Aerospace and Electronics (NAECON)

作者： Patrick C. Hytla Joseph C. French Nicholas P. Vicen Russell C. Hardie Eric J. Balster Frank O. Baxley Kenneth J. Barnard Mark A. Bicknell Sensor Systems Division University of Dayton Research Institute Dayton OH USA Department of Electrical and Computer Engineering University of Dayton Dayton OH USA General Dynamics Advanced Information Systems Corporation Dayton OH USA Air Force Research Laboratory EO Threat and Target Detection Branch Dayton OH USA

Midwave infrared (MWIR) persistent surveillance systems typically attempt to maximize coverage area leading to designs that push the limits of resolution. This places few pixels on target and can lead to performance challenges related to high spatial frequency content. This is especially true of pixel sized objects in the imagery and the potential for small apparent temperature differences between these objects and local background causing low contrast. Further complicating the issue is the need to compress the imagery during transmission. Lossy compression effects from JPEG 2000 compression were examined to determine the effects on pixel sized objects in the imagery. Furthermore, the optimum order of operations within the image processing chain necessary to preserve pixel sized object information in compressed imagery is investigated. Applying unsharp masking prior to 14-bit JPEG 2000 compression followed by decompression produced the best results at maintaining the integrity of pixel sized objects at compression ratios up to 40:1 based on visual interpretation of the imagery.

关键词： Image coding Pixel Transform coding Measurement Clutter Thyristors Surveillance

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Single-shot optical-path-length-shifting color digital holography

Single-shot optical-path-length-shifting color digital holog...

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Biomedical Optics, BIOMED 2010

作者： Kakue, Takashi Kuwamura, Mitsuo Shimozato, Yuki Tahara, Tatsuki Awatsuji, Yasuhiro Ura, Shogo Nishio, Kenzo Kubota, Toshihiro Matoba, Osamu Graduate School of Science and Technology Kyoto Institute of Technology Matsugasaki akyo-ku Kyoto 606-8585 Japan Advanced Technology Center Kyoto Institute of Technology Matsugasaki Sakyo-ku Kyoto 606-8585 Japan Kubota Holography Laboratory Corporation Nishihata 34-1-609 Ogura-cho Uji 611-0042 Japan Department of Computer and Systems Engineering Kobe University Rokkodai 1-1 Nada-ku Kobe 657-8501 Japan

ISBN: (纸本)9781557528872

关键词： Mean square error

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A new family of two-dimensional triple-codeweight asymmetric optical orthogonal code for OCDMA networks

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Chinese Optics Letters 2009年第2期7卷 102-105页

作者：殷洪玺梁巍马乐覃丽巧 School of Electronic and Information Engineering Dalian University of Technology State Key Laboratory on Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University

A new generation algorithm of two-dimensional triple-codeweight asymmetric optical orthogonal codes for optical code division multiple access （OCDMA） networks is proposed. The code cardinality is obtained and the error-probability performance for corresponding OCDMA system is analyzed. The codes with two constraints （i.e., auto- and cross-correlation properties） being unequal are taken into account. On the premise of fixed system resources, the code of the error-probability performance, it is shown cardinality can be significantly improved. By analysis that the codes with different parameters have different performances. Therefore, this type of codes can be applied to support diverse quality of service （QoS） and satisfy the quality requirement of different multimedia or distinct users, and simultaneously make the better use of bandwidth resources in oDtical networks.

关键词： Code division multiple access Data communication systems Distributed computer systems Multimedia systems Quality of service Two dimensional

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Numerical analysis of four-wave-mixing based multichannel wavelength conversion techniques in fibers

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Journal of Semiconductors 2009年第5期30卷 55-59页

作者：贾亮张帆李明刘育梁陈章渊 Optoelectronic System Laboratory Institute of SemiconductorsChinese Academy of Sciences State Key Laboratory of Advanced Optical Communication Systems & Networks School of Electronics Engineering and Computer SciencePeking University

We numerically investigate four-wave-mixing （FWM） based multichannel wavelength conversion for amplitude-modulated signals, phase-modulated signals, together with mixed amplitude and phase modulated signals. This paper also discusses the influence of stimulated Brillouin scattering （SBS） effects on high-efficiency FWM-based wavelength conversion applications. Our simulation results show that DPSK signals are more suitable for FWM-based multichannel wavelength conversion because the OOK signals will suffer from the inevitable data- pattern-dependent pump depletion. In future applications, when the modulation format is partially upgraded from OOK to DPSK, the influence of OOK signals on the updated DPSK signals must be considered when using multi-channel wavelength conversion. This influence becomes severe with the increase of OOK channel number. It can be concluded that DPSK signals are more appropriate for both transmission and multichannel wavelength conversion, especially in long haul and high bit-rate system.

关键词： stimulated Brillouin scattering wavelength conversion four-wave mixing nonlinear optics

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Numerical analysis for four-wave mixing based wavelength conversion of differential phase-shift keying signals

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Chinese Optics Letters 2009年第7期7卷 617-620页

作者：贾亮张帆李明刘育梁陈章渊 State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University Optoelectronic System Laboratory Institute of Semiconductors Chinese Academy of Sciences

We numerically investigate the main constrains for high efficiency wavelength conversion of differential phase-shift keying （DPSK） signals based on four-wave mixing （FWM） in highly nonlinear fiber （HNLF）. Using multi-tone pump phase modulation techniques, high efficiency wavelength conversion of DPSK signals is achieved with the stimulated BriIlouin scattering （SBS） effects effectively suppressed. Our analysis shows that there is a compromise between conversion efficiency and converted idler degradation. By optimizing the pump phase modulation configuration, the converted DPSK idler＇s degradation can be dramatically decreased through balancing SBS suppression and pump phase modulation degradation. Our simulation results also show that these multi-tone pump phase modulation techniques are more appropriate for the future high bit rate systems.

关键词： Conversion efficiency Degradation Frequency modulation Optical frequency conversion Phase shift Phase shift keying Pumps Stimulated Brillouin scattering

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Study of the photonic crystal waveguide based on 2D compound lattice structure

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Optoelectronics Letters 2009年第5期5卷 321-323页

作者：吴朝军李艳萍王子宇 State Key Laboratory on Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University

By employing 2D plane wave expansion (PWE) and finite difference time domain (FDTD) methods,a photonic crystal waveguide (PCW) based on the compound square lattice structure is presented. Band-gap can be observed for TM polarization and compared with the simple lattice structure based on the same material,the band-gap is increased by 62.7%. Byoptimizing the parameters we get the PCW with the propagation only near the wavelength of 1.55 μm and a flat group indexcurve in a wide wavelength range of 40 nm. And the group velocity dispersion compensation can be realized by thestructure optimization. The results provide a reference for the study and application of photonic crystal waveguide based on the compound lattice structure.

关键词：二维光子晶体光子晶体波导晶格结构基础复合时域有限差分法平面波展开波长范围

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Nanotaper mode converter based on silicon pillar waveguide

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Chinese Optics Letters 2009年第4期7卷 312-314页

作者：易华祥祝阳周治平 Wuhan National Laboratory for Optoelectronics College of Science and EngineeringHuazhong University of Science and Technology State Key Laboratory on Advanced Optical Communication Systems and Networks Peking University School of Electrical and Computer Engineering Georgia Institute of Technology

A two-dimensional （2D） optimized nanotaper mode converter is presented and analyzed using the finite- difference time-domain （FDTD） method. It can convert the mode size in a silicon pillar waveguide （PWG） from 4 μm to 1 μm over a length of 7 μm and achieve a transmission efficiency of 83.6% at a wavelength of 1.55 μm. The dual directional mode conversion of the nanotaper and its ability to perform mode compression and expansion are also demonstrated. The broadband with high transmittance is satisfied in this structure. Using this silicon-based nanotaper, mode conversion between integrated photonic devices can be more compact and efficient.

关键词： Finite difference time domain method Method of moments Plants (botany) Waveguides

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Silicon electro-optic modulator with high-permittivity gate dielectric layer

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Chinese Optics Letters 2009年第10期7卷 924-925页

作者：朱梦霞周治平郜定山 Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology State Key Laboratory on Advanced Optical Communication Systems and Networks Peking University School of Electrical and Computer Engineering Georgia Institute of Technology

A high-permittivity （high-k） material is applied as the gate dielectric layer in a silicon metal-oxide- semiconductor （MOS） capacitor to form a special electro-optic （EO） modulator. Both induced charge density and modulation efficiency in the proposed modulator are improved due to the special structure design and the application of the high-k material. The device has an ultra-compact dimension of 691 μm in length.

关键词： Electrooptical devices Gate dielectrics Gates (transistor) Modulation Permittivity Semiconducting silicon compounds

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