Chemical compositions and optical properties of HfOxNy thin films at different substrate temperatures

High-k HfO_xN_y thin films have been grown by radio frequency (rf) reactive sputtering of metal Hf target in N₂/Ar/O₂ ambient at different substrate temperatures. The chemical compositions of the films have been investigated as a function of substrate temperature by X-ray photoelectron spectroscopy (XPS). XPS measurements showed that nitrogen concentration increases with an increase in substrate temperature. Room-temperature spectroscopic ellipsometry (SE) with photon energy 0.75–6.5 eV was used to investigate the optical properties of the films. SE results demonstrated that refractive index n increases with an increase in substrate temperature. Based on TL parameters which were obtained from the best fit results used in a simulation of the measured spectra, meanwhile, we conclude that the energy band gap (E_g) decreases with an increase in substrate temperature.     

光纤接入网步入快速发展期

光纤接入一直是多年来人们不断追求的梦想和探索的技术方向，但由于成本、技术、需求等方面的障碍，至今还没有得到大规模推广与发展。然而，这种局面最近有了很大的改观，出现可迅速发展的势头。主要是因为一些国家政策的扶持、运营商竞争的需要、对收入的追求，以及设备本身价格的下降，光纤接入技术由于各种原因，至今尚未在全球广泛应用，但在日本、美国、瑞典和意大利等国都获得了较多的应用。在中国，光纤接入也有了良好的开端，将在大城市广泛应用，并逐渐推广到全国。     

弹性分组环技术

弹性分组环技术是一种新兴的城域网技术。作者主要讨论了弹性分组环技术的特点和优势,并且简要介绍了弹性分组环技术目前在国内城域网建设中的一些应用。弹性分组环技术集以太网的经济性、IP的智能化、光纤环网的丰富带宽和可靠性于一体,是目前宽带IP城域网运营商的最佳组网方案。     

Characterization of ZnS:Cu, Br electroluminescent phosphor prepared by new route

Synthesis of electroluminescent ZnS:Cu, Br phosphor by a number of routes has been presented along with their brightness-voltage, brightness-frequency, brightness-waveform and spectral energy distribution studies. The sample fired in N₂ atmosphere with aluminum and bromine shows predominantly green emission with a peak around 530 nm whereas the sample prepared under H₂S and HBr shows the broadest emission spectrum with multiple peaks. These peaks may arise out of different possible bands of copper, self-activated luminescence of ZnS and association of copper with some of the donor levels formed because of the higher reactivity of HBr. All the samples have been found to obey the relation B=B₀ exp.(−b/V^0.5) which has been discussed using bipolar tunnel emission model. The frequency variation of brightness is linear. Samples containing bromine show multiple secondary peaks indicating that bromine helps in formation of multiple shallow traps.     

钒酸钇晶体及其在光纤通信中的应用

钒酸钇（YVO4）晶体具有良好的机械和物理特性，近年在光纤通信器件制造生产中得到了广泛的应用。本文介绍了基于YVO4晶体为材料的隔离器、环行器和交叉波分复用的功能及其原理结构。     

Walk－off型光隔离器的隔离度和插入损耗分析

本文介绍了与偏振无关的ｗａｌｋ－ｏｆｆ型光隔离器的原理和结构，从理论和实验两方面分析了影响隔离度和插入损耗的因素，定量计算了加工、调整误差、消光比等对隔离度和插损的限制，给光隔离器的选材、加工和调整提供了依据。     

计算机自动绘制光学零件图的软件系统的研制

介绍了计算机光学零件图自动绘制软件系统的功能，给出了用该软件完成的光学零件图图样，对程序设计过程中的难点及处理方法也进行了详细阐述。     

HS－2000型双反射镜补偿式高速摄影系统研究

介绍ＨＳ─２０００双反射镜补偿式高速摄影系统的补偿原理、结构及其试验结果。     

一种新型的光纤位移传感器

测量平动物体位移的光纤传感器已有许多报导,而测量转动物体位移的光纤传感器却很少,从原理和实验两方面对后一问题作了研究。     

光纤式机器人触觉传感器静态特性的实验研究

介绍了一种光纤式机器人触觉传感器，分析了这种传感器的静态特性，并通过理论分析和实验研究提出了一种消除干扰的方法。实验结果证明，传感器的最大绝对误差为０．０５３ｋｇ，相对误差为０．６２％。