光纤

Though there is no unrealizable technical difficulty for FTTH, its success shall highlight the following aspects and integrate efforts to solve the key points: develop new device and kernel control chip adapting to features of FTTH, reduce the cost of optoelectronic devices and passive devices; develop low cost, easy installation indoor optical fiber, cable and linker as well as matching construction equipments and tools; develop high density, easy operation optical fiber distribution frame; and develop concentrated remote monitor, management techniques and systems.

FTTH技术是未来宽带接入的主要模式，从长远来看也是其他技术无法取代的，FTTH虽然没有技术上不可实现的难点，但要使FTTH走向成功，以下方面值得重视并应集中力量攻关：开发适应FTTH特点的新型器件和核心控制芯片，降低光电器件和无源器件的成本；开发低成本、易安装的室内光纤、光缆和连接器及相配合的施工仪器工具；开发高密度、易操作的光纤配线架；开发集中的远程监视和管理技术及系统等（178）。

The dispersion properties of photonic crystal fibers are investigated using a fully vectorial effective index method that we proposed.

首次提出了研究光子晶体光纤色散特性的全矢量有效折射率模型，并研究了光子晶体光纤包层基模的分类。

A large mode area core erbium doped K9-glass single-mode photonic crystal fiber is designed by getting the pump and signal intensity profiles from plane wave expansion methodand solving propagation-rate equations.Its diameter is 20μm,limit ellipticity error is 94.7%,and limit offset of inner ventage is 0.1μm.Then we analyze its amplifier characteristics.

根据平面波展开法给出泵浦光和信号光本征模场分布，结合速率方程和功率传输方程设计一种大单模尺寸的实芯掺铒K9玻璃大模式面积单模光子晶体光纤，芯径为20μm；分析其椭圆度容差为94.7%，最内层小孔最大允许偏移量为0.1μm；分析了掺铒K9玻璃光子晶体光纤放大器的放大特性。

Based on the optoelectronics theory, the experiment device is designed, which is composed of pulse generator, LD light source, 1×3DQ, adjustable CTB, testing optic fiber, intervening light filters, fast micro-light watt-meter and data analysis system. The technology of optic fiber Raman scattering is analyzed for its application to temperature testing of railway engineering.

根据光电子理论，设计由脉冲发生器、LD光源、1×3路双工器、可控恒温槽、光纤、干涉型波分复用器、快速微光功率计和数据采集分析系统组成的实验装置，进行光纤喇曼散射技术用于铁道工程构筑物温度的监测研究。

So that it is impossible to look for some new theory to explain the character about energy deliver in hollow waveguide.

为了能更好地对这一类型的光纤进行分析，就需要有新的理论对空芯光纤的传输特性进行解释。

When the fiber is bent,the light ejects from the fundamental mode to form whispering gallery modes produced by reflection at the cladding-coating interface,or at the coating-air interface. On the synchronous coupling condition,the light from the WG modes will couple back and interfere with the fundamental mode,which leads to bending loss oscillations.

光纤弯曲时，从基模辐射出去的一部分能量在包层涂敷层或涂敷层空气界面处发生反射形成回音壁模，当满足同向耦合条件时，WG模又重新耦合回纤芯与基模发生干涉，使光纤的弯曲损耗产生振荡。

In the experiments, the output power of each ytterbium fiber amplifier is not less than 1 W and the total output power of the three amplifiers is not less than 3 W.

首次在国内用外差法实现了三路掺镱光纤放大器的相干合成输出，其中每路光纤放大器的输出功率≥1 W，三路总功率≥3 W。

The master oscillator-power amplifier scheme was used to realize phase control of three ytterbium fiber amplifiers, and the experimental results are presented.

最后采用主振荡并联放大器方案对三路掺镱光纤放大器进行实时相位探测与校正，实验给出了三路光纤放大器相干合成的结果。

At last, Master Oscillator-Power Amplifier scheme are used to realize phase controlling of three ytterbium fiber amplifiers. The experiment results of three fiber amplifiers are given.

最后采用主振荡并联放大器方案对三路掺镱光纤放大器进行实时相位探测与校正，实验给出了三路光纤放大器相干合成的实验结果。

The method of self-diagnose and self-repair of composite material using hollow-center opticalfiber to affuse agglutmant in smart structure is described in this paper.

介绍的是在机敏结构中利用空心光纤灌注胶液的方法来进行复合材料损伤、断裂的自诊断、自修复，对空心光纤的传光机理做了具体的研究和分析，运用这些特性对整个系统的总体方案作出了初步的分析。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。