光纤

The frequency shifts and relative intensity configuration of multidegree stokes spectrum were measured and a simple analysis of spectrum characteristics using the concepts of effective scattering cross-section and differences of vibrational e...

测试了两类光纤的多级Stokes谱的频移分布与相对强度分布，并从等效散射截面的相对大小和赈动能级差的相对大小对话的特征进行了初步的分析。目的是在实验研究的基础上探索刊用这两类常用光纤构成光纤拉曼激光器以及利用光纤拉曼散射谱的可能性。

Its wave propagation properties in symmetry and asymmetry structure are analyzed by 3-D EBPM including the analysis and study of the influence of refractive index to wave propagation. The bend fiber-slab is also studied in this paper and point that the influence of the refractive index of the substrate to wave propagation in fiber-slab is very important. The calculating results agree with the results of the test.

本论文利用三维显式光束传播法很方便地分析了对称、非对称光纤—光波导复合结构中光波的传输问题，包括光纤折射率的大小、光波导折射率的大小对光波传输的影响等在内的主要内容；随后又研究了光纤弯曲时光波导包层折射率对光纤内能量功率大小的影响，计算结果和实验结果吻合。

FOG is one kind of laser gyroscopes. IT is based on the interferential theory of Sagnac. And its lamp-house is used with laser. A photic loop is made by fiber. There are clockwise and withershins sheaveses of lights transfer in the circle. With the turn of the circle ,the two lights introduce phasic difference ,so the angle velocity is measured.

光纤陀螺仪是激光陀螺的一种，它采用的是Sagnac干涉原理，以激光作为光源，用光纤构成环形光路并检测出由正反时针沿光纤传输的两束光，随光纤环转动而产生的两路激光束之间的相位差，由此计算出旋转的角速度。

Fiber Bragg Grating is a fiber optic device that is expected to be of great applicative prospect in fiber communication.

光纤布拉格光栅是国际上新兴的一种在光纤通讯、光纤传感等光电子处理领域有着广泛应用前景的基础性光纤器件。

It is found from experiment that when pumped by skew light along the fibre's axis, both transverse electric wave and transverse magnetic wave exist in WGM lasing emission simultaneitly. With the increase of refractive index of cladding dye solution, the wavelength spacing between TE and TM waves of which the radial mode number and angular mode number are the same value decreases, and the central lasing wavelength of WGM bluely shifts to short wavelength direction.

实验发现，在抽运光以偏斜光线方式沿光纤的近轴向抽运时，回音壁模式的光纤激光辐射中，既存在光电矢量和光纤径向垂直的横电波，也存在光电矢量和光纤径向平行的横磁波；随增益包层染料溶液折射率的增加，径向模式数和角模式数相同的TE波和TM波之间的波长差单调减小，回音壁模式激光辐射的中心波长向短波方向移动，辐射的波长范围变窄。

In addition, analytic expression of the waist spot size and working distance of output Gaussian beam were derived, and the influence of coreless fiber and GRIN fiber's length upon fiber-lens parameter was discussed by numerical simulation results.

推导了出射高斯光束的束腰半径和工作距离的解析表达式，进而对该光纤透镜做了数值模拟，讨论了无芯光纤和GRIN多模光纤的长度对光纤透镜参数的影响。

TEC part affected Gaussian beam waist radius,Coreless part worked on the space between beam waist and thin lens,and GRIN part acted as thin lens,in which focal length was determined by fiber index distribution parameter g.

推导了出射高斯光束的束腰半径和工作距离的解析表达式，进而对该光纤透镜做了数值模拟，讨论了无芯光纤和GRIN多模光纤的长度对光纤透镜参数的影响。

The dispersion-compensation fiber can be manufactured by MCVD, and with the use of the technology about the rolling fiber performing bars on drawbench, the polarization-mode dispersion of the fiber is reduced.

采用在光纤拉丝时旋转预制棒的工艺减小了光纤的偏振模色散，并采用化学汽相沉积光纤生产工艺，研制出了性能较好的色散补偿光纤。

FBG sensing technology and its recent progress in applications isintroduced systematically;the coupled-mode theory and the sensing principleof FBG are expatiated and the Bragg formula and reflectivity formula arededuced;the work principle, variety and essential characteristic of PZT areexpatiated in detail, and the configuration of PZT parts of an apparatus issummarized. The mechanism of piezoelectric electrostriction is analyzeddeeply, and the normalized control model is introduced aiming at analyzinghysteresis characteristic, and an electrical polarization intensity control methodbased on the aforementioned model which can effectively reduce the hysteresischaracteristic is discussed.

论文系统地介绍了光纤光栅传感技术及其应用的研究进展状况；详细地阐述了光纤光栅的耦合模理论及光纤布喇格光栅的传感机理；推导出了光纤布喇格光栅的布喇格公式和反射率公式；详细地阐述了压电陶瓷的工作原理、种类和基本特性，总结了压电陶瓷器件的结构形式，深入地分析研究了压电陶瓷逆压电效应及电致伸缩机理，并针对其迟滞特性给出了压电陶瓷归一化控制模型，在此模型基础上采用电极化强度控制方法有效地降低了压电陶瓷的迟滞特性。

The factors include the material, the structure, the refractive index distributing, the length, the diameter, the num erical aperture,thermal effect and the coupling of optical fiber.

这些因素主要包括光纤材料、构造、光纤的折射率分布、光纤的长度和芯径、光纤的数值孔径和热效应以及耦合等。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。