光纤

A semi-analytical calculation method of bit-error ratio and Q-factor is proposed. Numerical algorithm of WDM signal propagation in a nonlinear, dispersive fiber is carefully improved, resulting in greatly reduced computing time.

将解析模型和计算机模拟结合在一起，对用正色散传输光纤和大负色散补偿光纤的10Gb/s WDM系统，在不同的色散管理条件下光纤非线性对系统性能的影响作了较全面的分析。

Through the research on quintuplicate DCF, some parameters about the performance of the dispersion compensation fiber are analyzed, only in some range of drawbench radius, a big negative dispersive slope can be achieved at the expense of the negative dispersive value.

对五包层色散补偿光纤进行了研究，分析了各个参量对色散补偿光纤性能的影响，发现色散补偿光纤只有在一定范围的拉丝芯径内，以牺牲负色散数值为代价才能获得较大的负色散斜率。

Through the research on quintuplicate DCE some parameters about the performance of the dispersion compensation fiber are analyzed, only in some range of drawbench radius, a big negative dispersive slope can be achieved at the expense of the negative dispersive value.

对五包层色散补偿光纤进行了研究，分析了各个参量对色散补偿光纤性能的影响，发现色散补偿光纤只有在一定范围的拉丝芯径内，以牺牲负色散数值为代价才能获得较大的负色散斜率。

Lost and cost are two problems which are difficult to be resolved coinstantaneous in Fiber Bragg grating reflection signal pickup. We analyzed the spectra transmission characteristics of FBG Sagnac loop with coupled mode theory , and discussed the affection of optical path difference to its transmission.

论文利用模式耦合理论，对光纤Bragg光栅Sagnac环的传输特性进行细致的讨论，分析了光程差对其传输特性的影响，并提出了光纤光栅Sagnac环包络带通滤波器的概念，指出其在光纤光栅反射信号提取中的低损耗和低代价的特性，最后通过实验研究验证了理论上的分析和构想。

We got the simple and high accurate eigenvalue equations and cutoff frequency formulae of all propagation modes. Second, to the optical fiber with homogeneous cladding, we defined the "permittivity ratio", and we got the simple and high accurate connection of cutoff frequency to the ratio. Third, to the fiber with inhomogeneous cladding, we analyzed the dispersive and power-frequency characteristics.

第二，对于具有各向同性包层的弱渐变光纤，引入了介电比，找到了精度高且形式简洁的截止频率对折射率参数的依赖关系；第三，对于具有各向异性包层的弱渐变光纤，首次通过包层的轴向与横向的介电常数比分析了该类光纤的色散和功率特性。

Tunable laser is the key devices in WDM fiber communication system, and is used in the fields of optical sensing system and high resolution spectroscope as well.

可调谐光纤激光器不仅是波分复用光纤通讯系统中的关键器件，而且还可以运用于光纤传感器和光谱分析等领域。

In engineering construction company owns the world's most advanced cable testing and splicing of the instruments and meters, of which the United States and the United States Tektronix PK company Optical Time Domain Reflectometer 3 sets, Sweden, Ericsson is one of the Optical Fiber Fusion Splicer Units and Japan Proton Optical Fiber Fusion Splicer¨Units 3 domestic Kuala Optical Fiber Fusion Splicer sets of 6, as well as the United Kingdom York's 3 sets of fiber optic cable construction tools; companies not only pay attention to construction equipment and service equipment is equipped with resources and more emphasis on continuously improve enterprise management level and advanced technology sexual.

在工程施工方面公司拥有世界先进的光缆测试和熔接的仪器仪表，其中美国泰克公司和美国 PK 公司光时域反射仪 3 套，瑞典爱立信公司的光纤熔接机 1 台和日本腾仺光纤熔接机 3 台，国产吉隆光纤熔接机 6 套以及英国约克公司的光缆施工工具 3 套；公司不仅注重施工设备和服务设备资源的配备，而且更为强调不断提高企业管理水平和技术先进性。

This includes the surface mounted and embedded optical fibre damage detection system, the use of fiber optic strain sensors for monitoring acoustic emission from within composite specimens , and a fiber optic strain rosette for maping the strain tensor within a composite structure.

介绍了光纤传感器在飞行器结构上的应用，包括表面贴装与内埋光纤损伤探测系统，内埋的监测复合材料内部声波辐射的光纤应变传感器及测量复合材料内应变张量的应变计。

With given parameters of the fiber grating, the transmission spectrum of the long-period fiber grating was obtained by simulation with Matlab. As a result, the position of the resonant wavelength of the long-period fiber grating is decided by the grating′s period. The attenuation changes with the length and refractive index of the grating.

在设定的光纤光栅参数条件下，通过Matlab进行模拟得到了最终需要的长周期光纤光栅透射谱，并由此得出：长周期光纤光栅谐振波长出现的位置主要由光栅的周期决定，损耗大小可以通过调节光栅长度和折射率来实现。

If long lifetime and reliability need to be obtained, the antifatigue factor nd must be increased and the stress of the fiber in cable must be reduced.

实验还表明，提高光纤的抗疲劳因子nd和减小光缆中光纤的应变，可以更好地保持光缆中光纤的使用寿命和可靠性。

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。