镨掺杂分布对1.3μm光纤放大器特性影响

对掺氟化镨玻璃光纤放大器的小信号增益，用广义的高斯近似公式可获得精确的分析表达。文中研究了限制光纤芯层中央部分的镨掺杂对光纤放大器特性的影响，结果发现限制镨掺杂分布能改进光纤放大器的工作效率，且截止波长比芯层全部均匀掺镨的光纤更长。     

Development of cable fault location method using fiber optic distributed temperature sensor

When ground-fault problems occur on a cable line, immediate fault location and restoration are required. Therefore, various new methods to locate the fault point instantaneously have been investigated to replace such conventional methods as the Murray loop method and the pulse radar method [1]. These methods require a long time to locate the fault point. One possible fault location method is to sense the temperature rise following a ground fault using a fiber optic distributed temperature sensor. Application of this method was found feasible through sensing the temperature rise at a ground-fault test using a thermocouple as a temperature sensor with test cables [4]. A power/optical composite cable was prepared experimentally and after verifying its thermal mechanical performance, the temperature rise at an incidence of a fault was determined and the anticipated performance was demonstrated in a ground-fault test. This article describes the outline of the test.     

OPGW应用问题的探讨

根据多年的光纤复合架空地线(0PGW)应用经验与实践，从0PGW结构及组成、光纤余长、线路配合、金具配套、0PGW安装等方面，对0PGW应用中的若干问题进行详细的探讨。     

Morphology of conducting polymeric coatings: quantitative comparison between theory and experiment

The density profile of electrosynthesized polymeric layers on carbon fibers is obtained from gravimetric and scanning electron microscopy (SEM) data. The coating density ρ is found to decrease with increasing radial distance, r, subject to the power law . Based on a modified diffusion-limited aggregation (DLA) model, it is shown that lattice Monte Carlo simulation of the coating process predicts the experimentally observed power law exponent.     

一种改进的快速相位相关算法在FBG测温系统中的应用

分析了LFPC算法、FPC算法、CCA算法对光纤布拉格光栅原始信号寻峰,比较了误差均值和标准偏差。在改变波长分辨率、信噪比的情况下比较了三种算法的误差,并进行了仿真验证。证明了对快速相位相关算法的改进在精度方面有了一定的提高。     

浅谈涤纶FDY生产新技术──TCS一步法的特点

ＴＣＳ系指德国巴马格公司最新推出的细旦涤纶纺丝技术，该技术突破了热辊拉伸这一传统的涤纶纺丝模式，以甬道中的热空气为传热媒体，使丝条在稳定均一的热环境中完成拉伸过程。ＴＣＳ与ＣＷ６超高速卷绕机配合使用，可在极高的纺速下一次形成比较完善的纤维结构，从而获得条干和染色性能优异的成品纤维。该文介绍了该技术的工艺流程、设备结构和产品特点等。     

光纤电磁场传感器中调制与解调电路的设计及实现

文［１］提出光纤电磁场传感器中的光调制与电解调技术。本文针对光纤电磁场传感器中的一些特殊问题，着重讨论光调制与电解调电路的设计原理。并将实现的电路应用于单光路检测的光纤电磁场传感器中，实验测试取得满意的结果。     

光纤的总剂量效应分析研究

对光纤的总剂量效应进行了研究.介绍了光纤结构及传输特性,分析了光纤的总剂量效应.讨论了60Co-γ射线辐照条件下的试验结果.分析表明,在空间辐射环境中,光纤的传输性能在长波段受影响较小.对光纤在空间的应用有参考意义.     

In-fiber liquid-level probe based on Michelson interferometer via dual-mode elliptical multilayer-core fiber

Abstract

An in-fiber liquid-level probe fabricated from homemade dual-mode elliptical multilayer-core fiber (EMCF) was proposed and experimentally demonstrated. The proposed sensor simply consists of a segment of the EMCF with one end coated with silver film, and a Michelson interferometer is roughly established when light from single-mode fiber incident from the other end. The detected interference patterns, rather clean due to the few-mode property, shift as the liquid level due to strong interaction between high-order modes and measurands through evanescent waves. Both the propagation characteristics and operation principle of such a sensor were demonstrated in detail, and sensitivities of 33.48, 43.35, and 48.93 pm/mm corresponding to liquid indices of 1.333, 1.353, and 1.373 were successfully achieved with a 50-mm EMCF probe, respectively. Moreover, the proposed sensor had the potential to discriminate measurand index after proper calibration.     

五阶非线性作用下光纤中类明孤子的演化特性

根据含五阶非线性微扰修正项的非线性薛定谔方程,采用变分法,导出了光纤中类明孤子各参数随传输距离演化的方程组,研究了脉宽与距离、啁啾与脉宽之间的关系,并对描述相位和频率的方程组用龙格-库塔算法进行了数值求解.结果表明:五阶非线性使类明孤子的脉宽压缩,可在一定程度上抵消初始啁啾和三阶色散对脉宽的展宽作用;五阶非线性对类明孤子的相位和频率演化特性的影响不明显,因而适度的五阶非线性(γ在0.0001到0.1之间)有利于类明孤子的稳定传输.