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Investigation of all-optical regeneration based on self-phase modulation in microstructured fibers

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Optoelectronics Letters 2007年第1期3卷 18-21页

作者： WEI Yan-fen XU yong-zhao Zhang Xia huang yong-qing REN Xiao-min Optical Communication Center Beijing University of Posts and Telecommunications Beijing 100876 China

All-optical regeneration based on self-phase modulation in microstructured fibers is studied. The effects of pulse peak power into the fiber, pulse width and filter parameters on the performance of the regenerator are investigated. The effects of normal dispersion and anomalous dispersion of the microstructured fiber on optical regeneration are compared. The nu- merical results show that optical regeneration can be achieved by using microstructured fibers with normal dispersion or anomalous dispersion, but the normal dispersion decreases the oscillatory structure in the broadened spectra and obtain a better regenerator transfer function. In order to achieve optical regeneration, the input peak power into the microstructured fiber and the filter parameters need to meet certain requirements. By optimizing those parameters, a better regeneration result can be obtained.

关键词：微结构光纤全光再生自相位调制滤波器参数

Design and study of a long-wavelength monolithic high-contrast grating resonant-cavity-enhanced photodetector

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Optoelectronics Letters 2019年第4期15卷 250-254页

作者： ZENG Kun DUAN Xiao-feng huang yong-qing LIU Kai REN Xiao-min State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications

Novel construction of a resonant-cavity-enhanced photodetector(RCE-PD) with monolithic high-contrast grating(HCG)is proposed to overcome the difficulty of fabricating a high reflective mirror of RCE-PD at 1 550 nm. In this structure,HCG serves as the top mirror of the RCE-PD, whereas InGaAs serves as a sacrificial layer to achieve monolithic *** the bandwidth optimization, the ratio of the thickness of the total intrinsic region and the absorption layer is introduced to realize the simultaneous optimization of the thickness of spacing layers and absorption layer. After structural optimization, the quantum efficiency of the device with diameter of 20 μm is 82% at 1 550 nm, and the 3-dB bandwidth is 34 GHz at a bias of 3 V.

关键词： Novel construction resonant-cavity-enhanced photodetector(RCE-PD) high-contrast grating(HCG)

Growth of Zinc Blende GaAs/AlGaAs Radial Heterostructure Nanowires by a Two-Temperature Process

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Chinese Physics Letters 2011年第3期28卷 140-143页

作者： GUO Jing-Wei huang Hui REN Xiao-Min YAN Xin CAI Shi-Wei GUO Xin huang yong-qing WANG Qi ZHANG Xia WANG Wei Key Laboratory of Information Photonics and Optical Communications(Ministry of Education) Beijing University of Posts and TelecommunicationsBeijing 100876

Zinc blende structure GaAs/AlGaAs core-multishell nanowires(NWs)are grown on a GaAs(111)B substrate by a two-temperature process using an Au-catalyzed vapor-liquid-solid mechanism and metal organic chemical vapor deposition,***-free radial heterostructure NWs are *** can be concluded that the NWs are grown with the main contributions from the direct impingement of the precursors onto the alloy droplets and little from adatom *** results indicate that the droplet acts as a catalyst rather than an adatom *** photoluminescence spectra reveal that the grown NWs have much higher optical efficiency than bare GaAs NWs.

关键词： GaAs/AlGaAs nanowires Zinc

Unintentional Doping Mechanisms in GaAs/Si Films Grown by Metalorganic Chemical Vapor Deposition

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Chinese Physics Letters 2013年第11期30卷 140-143页

作者： WANG Jun DENG Can JIA Zhi-Gang WANG Yi-Fan WANG Qi huang yong-qing REN Xiao-Min State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876

To explain different doping effects in a buffer layer,thermally annealed interface,and upper epilayers of GaAs/Si films grown by Metalorganic Chemical Vapor Deposition(MOCVD),the behaviors of unintentional doping in GaAs/Si films are investigated in detail.A third doping mechanism of arsine impurity incorporation during the growth process of GaAs/Si films,apart from conventional mechanisms of gas phase reaction and diffusion from the silicon substrate,is *** experimental results reveal that the doping behavior in the buffer layer studied is determined by the three types of doping mechanisms *** in the thermally annealed interface and upper epilayers,the third doping mechanism is *** to the third mechanism,the background carrier concentration in GaAs/Si films grown by MOCVD could be properly controlled through the arsine flow rate.

关键词： GaAs/Si MOCVD doping

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基于混合型评价矩阵的多属性群决策方法

系统工程理论与实践 2013年第2期33卷 473-481页

作者：戚筱雯梁昌勇黄永青丁勇合肥工业大学管理学院合肥230009 过程优化与智能决策教育部重点实验室合肥230009 铜陵学院计算机科学系铜陵244000

本文针对具有语言型、直觉模糊数和区间直觉模糊数三种评价信息的混合型多属性群决策问题,提出一种基于属性权重和专家权重均未知的决策方法.首先,定义新的转换函数,可将不同粒度的语言评价信息统一成区间直觉模糊数;然后,基于支持度确... 详细信息

本文针对具有语言型、直觉模糊数和区间直觉模糊数三种评价信息的混合型多属性群决策问题,提出一种基于属性权重和专家权重均未知的决策方法.首先,定义新的转换函数,可将不同粒度的语言评价信息统一成区间直觉模糊数;然后,基于支持度确定未知属性权重,并在综合考虑区间直觉模糊数熵值和相似度的基础上,建立了一种新的专家权重确定模型;在将混合型决策矩阵转换成区间直觉模糊决策矩阵后,利用IIFWA算子依次集结个体决策矩阵,从而得出方案集的排序.最后,应用在ERP选优问题中,验证了方法的有效性.

关键词：群决策混合决策矩阵语言评价直觉模糊数区间直觉模糊数熵

Spectrally Sliced Pulse Source Based on Supercontinuum Generation in Dispersion-Flattened Photonic Crystal Fiber

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Semiconductor Photonics and Technology 2008年第3期14卷 162-166,206页

作者： XU yong-zhao ZHANG Xia huang yong-qing REN Xiao-min Department of Electronic Engineering Dongguan University of Technology Dongguan 523808 CHN Key Laboratory of Optical Communication and Lightwave Technologies Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 CHN

Designed is dispersion-flattened photonic crystal fiber（PCF） with small normal dispersion for generating flat wideband supercontinuum （SC）, and demonstrated is spectrally sliced pulse source which utilizes supereontinuum generated in dispersion-flattened photonic crystal fiber. The results show that the fiber characterized by flattened dispersion with small normal dispersion is suitable for flat wideband supercontinuum generation. In the process of spectral broadening, self-phase modulation plays a dominant role. By filtering the supercontinuum, multi-wavelength pulses can be obtained over a wide spectral range.

关键词： supercontinuum dispersion photonic crystal fiber

Growth of Self-Catalyzed InP Nanowires by Metalorganic Chemical Vapour Deposition

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Chinese Physics Letters 2012年第12期29卷 145-147页

作者： LV Xiao-Long ZHANG Xia YAN Xin LIU Xiao-Long CUI Jian-Gong LI Jun-Shuai huang yong-qing REN Xiao-Min State Key Laboratory of Information Photonics&Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876

The fabrication of self-catalyzed InP nanowires(NWs)is investigated under different growth *** droplets induced by surface reconstruction act as nucleation sites for NW *** standing NWs with uniform cross sections are obtained under optimized *** is confirmed that the growth rate of NWs is strongly affected by the surface diffusion adatoms while contributions from the direct impingement of vapor species onto the In droplets can be *** results indicate that the droplet acts as an adatom collector rather than a ***,the diffusion flow rate of adatoms increases with time at the beginning of growth and stabilizes as the growth proceeds.

关键词： nanowires diffusion negligible

磷酸三丁酯萃取分离磷-电感耦合等离子体原子发射光谱法测定高纯黄磷中铁锌硅铝

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冶金分析 2017年第11期37卷 52-58页

作者：李佳黄永庆江西省安全生产科学技术研究中心安全科研标准所江西省工业安全工程技术研究中心江西省化学工业设计院工艺设计所

将2g黄磷经硝酸回流冷凝消解后,采用磷酸三丁酯(TBP)萃取分离高纯黄磷消解液中的磷酸,从而降低磷酸与铁、锌、硅和铝的络合作用,同时降低待测消解液的黏度,使用电感耦合等离子体原子发射光谱法(ICP-AES)测定其中的铁、锌、硅和铝,从而... 详细信息

将2g黄磷经硝酸回流冷凝消解后,采用磷酸三丁酯(TBP)萃取分离高纯黄磷消解液中的磷酸,从而降低磷酸与铁、锌、硅和铝的络合作用,同时降低待测消解液的黏度,使用电感耦合等离子体原子发射光谱法(ICP-AES)测定其中的铁、锌、硅和铝,从而建立了磷酸三丁酯萃取分离磷-电感耦合等离子体原子发射光谱法测定高纯黄磷中铁、锌、硅和铝的方法。方法以样品溶液和TBP的体积比为1∶1、振荡时间为1min、静置时间30min为萃取条件。各元素质量浓度为0.50~50μg/mL范围内与其发射强度呈线性,校准曲线相关系数r均大于0.999 5,方法中各元素检出限均低于0.093μg/g。按照实验方法测定黄磷样品中铁、锌、硅和铝,结果的相对标准偏差(RSD,n=5)均小于0.80%,结果与火焰原子吸收光谱法(FAAS)测定铁、锌、铝,重量法测定硅的结果相吻合。

关键词：磷酸三丁酯(TBP) 萃取分离电感耦合等离子体原子发射光谱法(ICP-AES) 高纯黄磷铁锌硅铝

Comparison Study on Three Different Reconfigurable Optical Add Drop Multiplexer Architectures

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Semiconductor Photonics and Technology 2007年第4期13卷 268-271页

作者： ZHOU Bin ZHANG Yang-an huang yong-qing REN Xiao-min Key Laboratory of Optical Communication and Lightwave Technologies Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 CHN

In this paper, we present the evolution of reconfigurable optical add drop multiplexer（ROADM） technologies, and compare three main ROADM architectures available on the market today. Three archhectures include broadcast-select and demux-switch-mux[and the integrated version planar lightwave circuit（PLC）] and wavelengths-selective switch.

关键词： ROADM broadcast-and-select demux-switeh-mux PLC wavelengths-selective switch