一种具有新型光电探光的光纤传感器

本文作者首次提出了一种可用于光纤传感器技术的、性能优越的新型金属包层光波导。     

一种新型光波导及其在光衰耗器中的应用

本文介绍一种能用于可调谐光衰耗器的新型光波导,其包层为金属汞,包层长度灵活可变。理论分析和实验均表明,这种光波导的光功率衰耗与包层长度成正比,在１．３μｍ光波长,当芯径为４００～６２μｍ时,应对光功率的衰减为０．０４～０．１６ｄＢ／ｍｍ,。以此光波导为基础的可调谐光衰耗器具有结构简单、性能优越等特点,其测量精度可达０．３ｄＢ。     

塑料光纤泄漏传感器的设计和性能

介绍了一种塑料光纤（POF）传感器的设计和操作，该传感器以从一根光纤到另一根光纤产生强度调制的非常规光泄漏为基础。人们已发现，主要损耗机理是渐逝损耗，并基于此现象设计出该光纤传感器。计算渐逝波的有效肤深与不同包层折射率之间的关系。将这种传感器作为不同液体的液位传感器，对其进行了试验并比较了试验结果。测量了用于这种探头的一系列测量的干输出（空气界面层）和湿输出（液体界面层）信号，并叙述了涉及传感器工作的重要因素。此外还报道了测量值的精度、结果的再现性（误差1.35％）和传感器工作的稳定性与不同入射功率下的时间之间的关系（误差0．85％）。报道的这种设计具有应用前景，并证实了这种器件作为液位探头以及双位开关的成功运行。     

光纤测量地面和建筑物变形

日本电报电话公司（NTT）的研究人员新近开发了一种被动式光纤传感器技术，用来测量地面和建筑物的形变．光纤安装简单，可连续测量，其花费也比以前的形变测量仪大大降低．当1.55μm的光脉冲在光纤中传输时，利用变形／损耗积分光学时域反射测量仪（OTD）可以测出来自形变或损坏部分的反射信号．根据反射信号的返回时间，这种仪器可以在整个光纤长度内探测到形变或损耗的位置和程度．NTT已经应用这项技术检查光纤网络的工作情况和辨别故障原因．一旦出现故障，有问题的光纤很容易被识别出来，因为来自二向色反射器（装在光纤末端）的O…     

折射率温度敏感式医用光纤温度传感器的研究

基于温敏探头包层折射率随温度变化引起其传输损耗变化的基本原理，本文提出一种温敏光传输模型，运用该传输模型分析温敏探头有关参数对传感器灵敏度的影响，并设计了传感器，实验表明，在35－45℃范围内，传感器温度分辨率△T≤0．1℃，最佳分辨率可达0．04℃。     

单模光纤设计和性能的进展

本文对近年来长波长单模光纤设计和性能的进展作了综合评述。常规单模光纤的零色散波长在1．3μm有匹配包层和压低包层两种折射率分布，设计和选择芯径d、折射率差△、归一化频率V、截止波长λε、建模直径dp等参数时，要使1．3μm的损耗、色散和抗弯能力等性能最佳化。于是考虑波导色散抵消材料色散，使零色散波长移至最低损耗波长1．55μm及其附近窗口。这类光纤称为色散移位和色散平坦单模光纤，其折射率分布有三角形、分隔纤芯和四包层等几种设计。将MCVD、OVD、VAD、PCVD四种工艺的设计和性能列表相互比较。最后总结光纤通信所用单模光纤的现状和前景。     

纯石英芯掺氟玻璃包层光纤的数值孔径

纯石英芯掺氟玻璃包层光纤是一种新结构的大芯径光纤,纤芯材料是纯石英玻璃,包层材料是掺氟石英玻璃,由于氟杂质可以降低石英玻璃的折射率,故纤芯材料与低折射率的包层材料可以组成传光波导。国外是采用POD（等离子体外相沉积）技术生产这种光纤,我们采用的是国内首创的管棒熔融套装法,制成了相同结构的光纤,为了提高光纤的性能,我们对该光纤进行了低、高折射率双层涂料涂覆,在测试中发现光纤的数值孔径参数随着光纤测试样品涂覆长度的变化而变化,变化范围为0.1889～0.3152。     

传感器及传感器数据融合、变送器

0618001金属薄膜/波导薄膜包覆光纤端面SPR生物传感器的研究〔刊,中〕/饶丰//海南师范学院学报(自然科学版).—2006,19(1).—38-41(D)提出了一种由高折射率纤芯/波导层/金属薄膜包覆层/被检测物层构成的四层结构表面等离子共振光纤生物传感器。对其研究发现:这种传感器能够很好地感应待测物的折射率,与三层薄膜结构光纤SPR传感器相比其衰减峰非常尖锐,这说明其损耗小且分辨力高,适合长距离、高精度、高分辨力场合的测量,对生物医学中的免疫反应实时检测及表面显微技术的研究具有重要的意义。参40618002无线传感器网络路由协议的研究与展…     

先进的光纤光缆技术：光缆网络的革新动向

一种采用１６纤带的高密度光缆目前已经被研制出来，光纤带由涂覆很薄的２００μｍ外径的光纤组成。对于１６芯和８０芯单模光纤连接器而言，平均光损耗分别达到０．２和０．３５ｄＢ。光缆接续时间已减少到目前需要的１／５。通过对纤芯和包层材料的粘度匹配，减少了光纤的结构不完整性损耗。经过改变沿长缆长度方向的布里渊频移，光缆的有效输入功率提高了７ｄＢ。     

单模光纤渐逝波传输分析

基于光波导理论，分析了单模光纤的渐逝波传输特性，在光纤包层介质具有吸收特性的情况下，导出了渐逝波传输的透入深度公式，得出了单模光纤在轴向上的功率传输情况；讨论了在不同的折射率或消光系数下，渐逝波的透入深度和功率损耗变化特性。研究结果可用来实现高精度、高灵敏茺的单模渐逝波传感器，并应用于医学诊断，环境检测，生物和化学分析等方面。     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first     

JOURNAL OF ELECTRONICS(CHINA)

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NOTICE OF CHANGING JOURNAL OF ELECTRONICS （CHINA） TO MICROSYSTEMS ＆ NANOENGINEERING

正Journal of Electronics(China)(JE)was founded in 1984,sponsored by the Institute of Electronics,Chinese Academy of Sciences.JE is one of the first English academic journals in China in the field of Electronics and Information technology.The journal was published quarterly since it was launched in 1984 to 2003,then it is published bimonthly till now.During