Optical fiber grating is a kind of passive photonic device formed by ultraviolet light into the core of a photosensitive fiber . the advantages of fiber gratings include low insertion loss , insensitive to polarization , and simply spliced into fiber systems 光纤光栅是利用石英光纤的紫外光敏特性将光栅直接做在光纤上而形成的无源光子器件，它具有插入损耗低、对偏振不敏感、与普通光纤连接简单等优点。
( 6 ) the study of electroplating ni ~ co coating on silica fiber showed that a special pretreatment must be preformed before electroless nickel because of the smooth surface of silica fiber . ( 7 ) a ni - co coating was acquired by means of eletroless and electroplating ( 6 )石英光纤表面电沉积ni - co合金镀层的研究表明，石英光纤化学性质稳定，表面光滑，化学镀前必须经过特殊的预处理工艺：脱脂，粗化，敏化，活化，烤烘等。
In modified fiber - optic sensing system , quantitative analysis of the interaction of the analytes with the cladding is the theoretical foundation of fiber - optic mode - filtered light chemo - and bio - sensing . in our study , we took example for the fused silica fiber that we used , to deduce a mathematical expression for mfld 在修饰光纤体系定量获取模式滤光信号的理论研究中，我们以我们所用的石英光纤为例，推导了光纤模式滤光信号的理论表达式。
Although a lot of study on fiber photosensitivity is established , the mechanism of germanosilicate fiber and the dependence of photosensitivity on hydrogen loading condition is not studied systematically , the photosensitivity data through experimental measurement is used in this paper 虽然目前有众多的光纤光敏性的研究，但是没有系统的分析掺锗石英光纤增敏的机理，也没有系统的研究载氢条件对光致折射率变化的影响，也没有进行实验测量光致折射率的改变。
Because the plastic optic fiber ( pof ) have many advantage in short distance communication , such as fine flexibility , connect easy , cost low and so on . in the field of sensing , compared with the silicca optical fiber ( sof ) , the pofs have high sensitivity , the range of measurement is big . so the plastic optical fiber more and more is valued by people , it has the quite considerable potential market and the application prospect 由于塑料光纤( pof )在短距离通信中所显示出来的可挠性好、对接容易、成本低等优势及其在传感领域较石英光纤( sof )有灵敏度高、动态测量范围大等优点,塑料光纤越来越受到人们的重视,具有相当可观的潜在市场和应用前景。
3 . because traditional coupling system composed with cylinder lens and focus lens has the disadvantages of difficult to encapsulation and modulate , a new practical method brings forward : the output light from laser diode is collimated using a section of optical fiber with the diameter of 600 m instead of cylinder lens , and a sphere ? end lens 3 .针对由柱透镜和聚焦透镜组成的组合透镜耦合系统中存在的封装和调试困难等问题,提出了:用一段直径为600 m的裸石英光纤代替柱透镜,对半导体激光器输出光束进行准直整形;用球透镜光纤对准直后的光束进行聚焦,直接实现和光纤耦合,来代替聚焦透镜和光纤耦合的环节。
2 . the pressure - and time - dependent fiber photosensitivity was studied in this paper and the uv - induced index changes were measured . the results show : while hydrogen pressure was increased , the photosensitivity gradually increases ; while hydrogen - loading time prolongs , the change of photosensitivity is consistent with the evolution of hydrogen concentration 二、研究了不同载氢压力下和不同载氢时间下的掺锗石英光纤的紫外光敏性，结果表明：掺锗石英光纤的光敏性随着载氢压力的增大，光纤的光敏性逐渐提高；随着载氢时间的延长，光纤光敏性的变化规律符合载氢模型。
As a result of the plastic optical fiber itself characteristic , the pof is used as the transmission material in short distance communication , has demonstrated the huge superiority in the recent years , thereupon the plastic optical fibre access network is an important developing direction of optical access network of future . the second chapter first to make the comparison among the copper wire , the silica fiber and the plastic optical fiber , pointed out the plastic optical fiber is better in the short distance communication , then introduced the development course of pof in the communication filed , finally proposed the plan scheme of the plastic optic fibre access network of a kind of building 塑料光纤本身的特点使得其作为短距离通信用传输媒质在近些年内已展示出巨大的优势,于是塑料光纤接入网是未来光接入网一个重要的发展方向。本论文第二章首先对主要的接入网媒质铜线、石英光纤和塑料光纤进行比较,指出塑料光纤在短距离通信方面的优势,接着介绍了塑料光纤在通信方面的发展历程,最后提出了一种楼宇塑料光纤接入网的计划方案。
Optical code division multiple access ( ocdma ) is a communication mode which introduces the code division multiple access ( cdma ) technology into optical fiber communication system . besides providing asynchronous communications access , ocdma system has many advantages , such as high capacity , security against interception , suppression of narrow band disturbances , capability in forming variable bit rate networks and multi - rate networks . it implies a great challenge for the development of future communication networks , especially all optical networks 光码分多址( ocdma )是将码分多址( cdma )技术与大容量的光纤通信技术相结合的一种通信方式，其主要优点表现在如下几个方面：允许多个用户随机地接入同一信道：可构成真正“透明”的全光通信网络；具有良好的安全性；允许可变速率或多速率传输，并可同时提供多种业务支持；具有优良好的抗干扰能力，并能够充分地利用石英光纤的可用带宽。
Ytterbium ( yb ) - doped silica fibers have a broad - gain bandwidth ( 850 ~ 1050nm ) , excellent power conversion efficiency , and a broad - absorption bandwidth ( 900 ~ 1200nm ) . their ability to provide amplification over the very broad wavelength range from ~ 975nm to ~ 1200nm is expected to generate increasing interest in the near future . they offer an almost ideal gain medium for the fiber lasers and fiber amplifiers that work at the wavelength around 1 m 掺镱石英光纤具有几个方面的优点,如能级结构简单,与掺er3 + 、 nd3 +等稀土离子的光纤相比,不存在对泵浦光或信号光的激发态吸收( esa ) ,可以有更高的掺杂浓度;有较宽的吸收光谱( 850 ~ 1050nm ) ,可以利用多种泵浦光源来设计泵浦方案;辐射光谱宽( 900 ~ 1200nm ) ,激光输出波长可以有很宽的可调谐范围。
