浅析减少光纤接续熔接损耗的措施

光纤接头熔接损耗是光纤熔接后光线传到接头处产生的损耗。在光纤熔接中要减少光纤线路损耗首先要降低光纤接头熔接损耗；本文从理论上分析了影响光纤熔接损耗的一些主要因素，根据理论分析和实践提出了减小熔接损耗的方法。     

光纤接续施工中减小光纤接头熔接损耗的方法

光纤接头熔接损耗是光纤熔接后光线传到接头处产生的损耗。在光纤熔接中要减小光纤线路损耗首先要降低光纤接头熔接损耗 ;从理论上分析了影响熔接损耗的一些主要因素 ,如光纤的模场直径不一致等 ,根据理论分析和实践提出了减小熔接损耗的方法就是消除这些影响因素 ;介绍了测量熔接损耗所采用的远端环回双向测量法。     

浅析降低光纤熔接损耗的方法

分析光纤熔接损耗产生的机理,论述降低光纤熔接损耗的几种措施和测量光纤熔接损耗的方法。     

光纤熔接技术

光在光纤中传输时会产生损耗,这种损耗主要由光纤自身的传输损耗和光纤接头处的熔接损耗组成。光纤自身的传输损耗是一个确定值,而光纤接头处的熔接损耗则与光纤的本身及现场施工有关。努力降低光纤接头处的熔接损耗,则可增大光纤中继放大传输距离和提高光纤链路的衰减裕量。     

单模光纤的熔接损耗与测量

论述了光纤熔接损耗产生的原因及如何降低光纤的熔接损耗 ;如何使用 OTDR测量光纤熔接损耗和怎样对测试曲线进行分析     

影响光纤熔接损耗的因素及解决方法

本文重点介绍了光纤熔接的基本步骤,分析熔接损耗产生的原因,并阐述了影响熔接损耗的主要因素及降低熔接损耗的方法,为进一步研究光纤的熔接损耗提供了理论依据。     

浅谈如何降低光纤的熔接损耗

详细介绍了光纤熔接的过程和步骤、光纤熔接损耗的影响因素及降低光纤熔接损耗的措施。     

降低光纤接头熔接损耗的方法

讲述了光纤熔接损耗的概念，如何测量。通过分析光纤接头熔接损耗的主要原因，提出了降低光纤接头熔接损耗的方法。     

减少光纤接头熔接损耗技术研究

光纤通信网络中光信号传输到光缆线路的光纤熔接接头位置处会产生极大的信号传输损耗,研究降低光纤接头熔接损耗技术具有现实意义.本文介绍了光纤接头熔接损耗的定义以及测量损耗值的方法.并且本文依据接头熔接损耗产生因素,对减少接头熔接损耗的具体措施进行了详细阐述,对光纤通信实际应用起到一定的参考价值.     

如何降低光纤熔接的损耗

光信号在光纤中传输产生的损耗主要是由光纤 自身的传输损耗和光纤接头处的熔接损耗组成的。光 纤自身的传输损耗与光纤的种类和成缆质量有关,而 光纤接头处的熔接损耗则与光纤的本身及现场施工 息息相关。熔接损耗过大势必会影响传输质量。     

Fusion splices for single-mode optical fibers

A practical low loss splicing method based on the discharge fusion for single-mode fibers was developed. Average splice losses of 0.4, 0.2, and 0.1 dB for fibers with 5.2, 7, and 10 μm core diameters, respectively, are obtained by a simple apparatus utilizing the self-alignment effect due to the surface tension of melted fiber ends. The surface tension effect is analyzed both experimentally and theoretically. Experimental splice losses, both after and during heating, coincide with the theoretical estimated values. It was found that the optimum heating temperature for low loss splices is near 2000°C at 8.5 W electric discharge power. Splicing loss causes are examined. The main cause of the practical splice loss is the residual core axis misalignment caused by an insufficient surface tension effect and core eccentricity with respect to cladding.     

影响光纤熔接损耗的因素及解决方法

针对造成光纤熔接损耗的各种本征和非本征因素,进行了详细的分析和总结.说明了各个损耗因素的取值范围;并以模场直径为例,分析了光纤模场直径不同时引起的连接损耗的变化.即举例介绍了光纤熔接损耗的计算方法;最后提出了降低光纤熔接损耗的解决方法,为进一步研究先纤的熔接损耗提供了理论依据.     

Theory and experiments on birefringent optical fibers embedded inconcrete structures

Theoretical and experimental results on birefringent optical fibers embedded in concrete are presented and discussed. We study the effect of strain on the propagation of light in birefringent fibers embedded in a host material loaded under uniform compression. Both longitudinal and transverse deformations are considered in the analysis since the fiber is embedded along a direction perpendicular to the strain load. The effects of the strain on the birefringence of the fiber and the rotation of the optical axis are studied. The theoretical model is used to determine the best polarimetric system configuration to detect strain. Our experimental work was performed by embedding optical fibers in standard concrete cylinders, attaching resistive electric strain gauges on the surface, and testing the specimens under uniform compressive stress. Optical transmission data from the fiber and readings from the electric strain gauges were simultaneously recorded     

Unusual fault detection and loss analysis in optical fiber connections with refractive index matching material

We investigated and analyzed an unusual fault that occurs in optical access fiber networks, which is caused by a defective fiber connection. We developed a fault-detection system to locate such a fault by using both optical power level and optical pulse measurement methods. We investigated a defective mechanical splice in three laboratory tests: outward appearance, non-destructive, and dismantled. As a result, we confirmed that the defective mechanical splice had large gaps of more than 10 μm. We also analyzed the unusual fault that occurs from such a defective mechanical splice in mechanically transferrable (MT) connector experiments. The experimental results revealed that the optical performance of fiber connections with a mixture of refractive index matching material and air-filled gaps was extremely unstable and varied widely. In the worst case, the insertion loss worsened to more than 30 dB. The case of the fault caused by a mixture of refractive index matching material and air-filled gaps between the ends of optical fibers is thought to occur independently of the sorts or structures of optical fiber connectors and could be a characteristic peculiar to optical fiber connections using refractive index matching material. These findings can be applied to optical fiber connections that use refractive index matching material, such as MT connectors in outside underground facilities, mechanical splices, or field assembly connectors at aerial and home sites in optical access networks. These findings also support the practical construction and operation of optical network systems.     

模场直径对单模光纤接续损耗的影响

模场直径描述了单模光纤所传输的光能在光纤中的分布情况,对于单模光纤耦合和接续是一个很重要的参数。光纤中光能分布情况可用高斯公式描述。在这种情况下,我们可算出两根待接光纤的模场直径不同所引起的接续损耗。通过试验数据的分析,可以看出试验结果和理论计算较为接近。本文仅涉及模场直径对单模光纤接续损耗的影响。     

A study on the development of transmission-type extrinsicFabry-Perot interferometric optical fiber sensor

The conventional reflection-type extrinsic Fabry-Perot interferometric (EFPI) optical fiber sensor has good sensitivity and resolution compared with other types of optical fiber sensors. However, they have the disadvantage that the distinction of strain direction of EFPI is difficult because of measurement method by only fringe counting. This paper presents the newly developed transmission-type EFPI (TEFPI) optical fiber sensor, which has been improved by additional functions, and whose measuring system differs from that of the reflection-type EFPI optical fiber sensors using a single-mode fiber (SMF) and multimode (MMF) fibers as light guides and reflectors, respectively. The output signal of the TEFPI optical fiber sensor was analyzed with the uniform plane wave-based model, the SMF power distribution-based model and the splice loss-based model; the analyzed signals were then verified experimentally. Based on the results of analysis, the TEFPI optical fiber sensor was fabricated using two single-mode fibers connected to the light source and optical receiver; this was then used in strain measurement. The strain measured by the TEFPI optical fiber sensor was compared with that measured by the electric strain gauge     

光纤带光纤接头损耗的探讨

阐述了传输波长对光纤接头损耗的影响以及光纤带光纤接头存在芯轴横向错位时模场直径对接头损耗的影响,引入了模场重叠率概念.探讨了纤芯与包层同心度误差、光纤带翘曲度对光纤带光纤接头损耗的影响.     

光缆施工中的接续技术探讨

在光缆施工工程中,光纤接续技术和接头损耗的测量是影响工程质量的一个重要因素。文中首先对光纤熔接损耗产生的具体原因进行了分析,然后从光缆的选择、施工的环境、工具的选用等方面提出了有效降低光缆施工中接续损耗的措施,最后针对带状光缆的特点,对如何降低带状光缆的接续损耗和提高损耗测试精确度提出了相关建议。     

浅谈光纤光缆接续损耗的降低

随着光纤通信的迅猛发展,用户终端对信号传输的质量要求越来越高。为了提高光缆线路接续质量,降低光纤的接续损耗,分析了光纤接续损耗的原因,结合实践经验针对熔接接续、活动接续和机械接续三种光缆接续方式介绍了降低其接续损耗的措施。     

Vectorial wave analysis of stress-applied polarization-maintaining optical fibers by the finite-element method

A vectorial wave analysis of stress-applied polarization-maintaining optical fibers is presented using a vectorH-field finite-element method. In this approach, the divergence-free constraint forHis imposed and the spurious, nonphysical solutions which are included in the solutions of earlier vectorial finite-element methods do not appear in a guided region. In order to verify the accuracy of solutions, numerical results for a step-index circular-core fiber are presented and compared with exact ones. We also propose an approximate method for calculating the splice loss between two optical fibers and show the normalized radiated power caused by transverse offset between two stress-applied optical fibers.