数字化扫描干涉仪用于保偏光纤偏振耦合检测

首先简要介绍了保偏光纤及其主要参数:模式耦合系数、拍长、偏振消光比和偏振串音等,并给出这些参数的定义和表达式;评价保偏光纤性能的拍长、模式耦合系数、偏振串音等参数也都与偏振耦合相关.讨论了偏振耦合测试技术,对成功应用于保偏光纤测试的波长扫描干涉法等七种方法作了比较.采用"白光"Michelson技术实现了光纤的寄生偏振耦合点空间分布位置测试仪,以该仪器完成了保偏光纤环扫描;偏振无源光器件测试;保偏光纤对轴;保偏光纤拍长测试;分布式(应力、位置、温度)传感;保偏光纤双折射色散测试等.并以保偏光纤环扫描为例给出实验结果,证明了仪器设计理论和实验结果的相符合性.     

光纤陀螺仪的光学器件偏振特性测试方法研究

介绍一种能够评价光纤陀螺中各种光学器件（保偏光纤、耦合器、去偏器和集成光学器件）的偏振特性的方法。试验装置用于评价保偏光纤的偏振特性，系统消光比高达55dB。测试3m长熊猫型保偏光纤，测得最大消光比24.6dB。     

双折射波导偏振耦合的短相干干涉测量

保偏光纤内部具有的高双折射,使其在内部传播的主模和耦合模之间存在一定的光程差。研究了高双折射波导中连续偏振耦合分布和分立点耦合的白光干涉测量法,推导出一种简明使用的公式,求出双折射波导的保偏参数,并且根据调制解调相关原理精确测量耦合点的强度和位置。实验测量了国产类矩形保偏光纤以及光纤偏振器。该方法最突出的优点是采用非破坏性方法测出保偏波导的每个局部的保偏参数,可用于检测集成波导器件和保偏光纤的质量、双折射波导之间的主轴对准、分布式光纤应变传感器等领域,并且可作为保偏光纤生产和使用的一种有效检测方法,大大提高集成波导器件及相关传感器的性能。     

保偏光纤偏振轴方位探测方法

保偏光纤偏振轴方位的探测和对准是保偏光纤耦合、连接及制作保偏纤维器件的前提.基于保偏光纤的物理特性和应力结构特征,本文分析了各种保偏光纤偏振轴方位探测和对准方法的原理和特点,讨论了该技术方法的现状和趋势.     

基于轴向张力法的保偏光纤动态n测量技术研究

保偏光纤因能保持传输中光的偏振状态而广泛应用于光纤陀螺等惯性导航器件.为了给保偏光纤的应用提供参考,准确评估表征保偏光纤机械可靠性、老化、寿命等性能的应力腐蚀敏感参数n非常重要,因此展开了基于轴向张力法的保偏光纤动态n测量技术研究.通过理论分析和实际试验验证,研究结果表明采用轴向张力法测保偏光纤动态n的最佳试验方案是按...     

保偏光纤偏振器的介质—金属复合光学膜系

本文介绍了一种保偏光纤偏振器的复合光学膜系，该膜系由一层ＭｇＦ介质缓冲膜层和金属Ａｌ膜构成，理论分析和实验研究表明，该光学膜系能去保偏光纤中的ＴＭ模，完成起偏振作用。利用此光学膜系已制成发给优良，实用的保偏光纤偏振器，消光比〉４０ｄＢ，损耗〈０．５ｄＢ。     

基于偏振消光的全光纤衰减器

提出了一种基于偏振消光原理的新型连续可调全光纤衰减器,用琼斯矩阵方法分析了保偏光纤偏振器组合的衰减器的衰减原理,模拟分析了偏振器的消光比对衰减器的动态范围的影响.实验证明用分辨率为5 000 step/rotation的伺服电机和两个消光比为30 dB的保偏光纤偏振器组成的衰减器能获得27 dB的衰减动态范围、0.126%的光强分辨率和0.5 dB的损耗,并具有结构简单、可靠性高、稳定性好、不改变光束特性等特点.该器件已经在惯性约束核聚变(ICF)的时间脉冲整形系统中获得应用.     

基于部分保偏器件的干涉型光纤传感器

在单模光纤构成的干涉型光纤传感器中,存在偏振衰落问题,将导致干涉效率降低.而为了消偏振衰落采用全保偏器件的光纤传感器成本过于高昂,影响其实用性.以马赫.泽德干涉仪为基础,用反馈信号控制偏振控制器加起偏器的结构消除了偏振衰落,构造了基于部分保偏器件的干涉型光纤传感器.实验得到系统输出信噪比稳定在60 dB左右.     

保偏光纤的偏振特性分析

在惯性制导用光纤陀螺中,用保偏光纤绕制的Sagnac环圈是其中的关键器件.文章首先介绍了保偏光纤中偏振光传输的概念与定义;然后,对保偏光纤偏振特性的表征参数:拍长、偏振串音和偏振保持参数(h)进行了详细的介绍;最后,分析讨论了h参数与偏振串音的关系.     

基于扭绞保偏光纤光栅的单纵模单偏振掺铒光纤激光器（英文）

提出并实现了一种基于扭绞保偏光纤光栅的单纵模单偏振掺铒光纤激光器。光纤激光器的线型激光谐振腔由两个均匀保偏光纤光栅构成并作为激射波长和纵模模式选择器件,均匀保偏光纤光栅采用248 nm KrF准分子激光直接刻写在不需要氢载的自制保偏光敏掺铒光纤上。利用保偏光纤光栅引起的偏振依赖损耗效应,通过对光纤激光器谐振腔进行适当扭绞,成功实现了稳定输出的单纵模单偏振掺铒光纤激光器。     

Multimode Fiber Devices for Optical Fiber Links, Printing, and Display

It is generally agreed that multimode graded index fiber has become the main fiber technology for optical communication applications. Multimode graded index fibers provide sufficient bandwidth for most applications without the critical tolerances of single mode fibers. In this paper, multimode fiber devices and components based on packaging miniaturized optical components for a GaAs laser array source package, and multichannel waveguides will be discussed. Experimental results, fabrication process and technology limitation for some of the multimode devices will be included. One major drawback of using multimode fibers is the difficulty to obtain simple and efficient switches and taps which are essential for data bus or other optical links. Some possible solutions for multimode fiber switches with miniaturized bulk wave devices will be presented.     

双芯光纤的制作及应用研究

双芯光纤是一种极其重要的无源光器件,它在光通信及光传感等方向发挥了不可替代的作用。首先介绍了目前主要存在的几种双芯光纤的结构、分类及其最新的制作工艺,然后根据双芯光纤独有的结构特性及两芯子之间耦合特性所表现出来的光谱特性在光纤传感与光通信领域的应用进行了叙述,最后通过数据知识平台的结果展示了近10年来与双芯光纤相关的热词并分析了双芯光纤近十年的发展趋势及其发展前景。     

Design and modeling of passive optical switches and power dividersusing non-planar coupled fiber arrays

Arrays of coupled waveguides such as the ubiquitous directional coupler are used extensively in optoelectronic devices, with demonstrated applications to optical communications networks, fiber interferometers, and optical homodyne receivers. In order to analyze the transmission characteristics of circular arrays of coupled optical fibers, we have developed a matrix representation of the coupled-mode formalism, allowing for varying fiber diameters and differing coupling strengths between the fibers in the array. The model is used to identify design criteria for application of such arrays as passive optical switches and power dividers     

Advances in Optical Fiber Communications: An Historical Perspective

Following a decade of intensive research, optical fiber transmission emerged in the late 1970's as a major innovation in telecommunications. This paper reviews the progress in the field of optical fiber communication. Advances in the areas of fibers, cables, passive components, active devices, and systems are presented in historical perspective. Recent research and development accomplishments that are likely to have important impact on future systems are emphasized.     

The stress-optic effect in optical fibers

The importance of the photoelastic effect in controlling polarization in optical fibers is discussed. Measurements of the stress-optic coefficient, its dispersion, and temperature dependence are reported using a fiber measurement method. The results compare closely to data obtained for bulk silica by an extrapolation technique. It is shown that the dispersion of the stress-optic coefficient can have a significant effect on the performance of birefringent fibers and of fiber birefringent devices. Furthermore, the temperature dependence is sufficiently large to be troublesome in fiber sensors.     

温度场对实芯光子晶体光纤的影响分析

光子晶体光纤可广泛用于光纤通信系统、光电信号检测等有源和无源光器件中.利用Edlen公式分析了温度场对实芯光子晶体光纤的空气孔折射率的影响并应用热传导模型对光子晶体光纤石英介质在温度场作用下产生的热应力及折射率分布变化进行了分析,讨论了温度场变化导致光子晶体光纤中光脉冲相位和模式双折射的波动影响.与传统单模光纤相比光子晶体光纤中传播的光脉冲对温度具有较弱的敏感特性,在光电信号检测等无源器件中更具优越性.     

从OFC2001会议看DWDM全光网中的无源器件

概述了在2001年OFC会议上出现的新型光无源器件，介绍了光无源器件的最新进展，着重分析了几种用于DWDM光网络中的最新型光无源器件的工作原理和结构。     

Methods for passive fiber chip coupling of integrated opticaldevices

A useful technique for high precision passive coupling of single mode optical fibers to integrated optical devices is crucial for cost effective packaging especially in multiport devices like switches (N×N) and other WDM components. These devices were fabricated on two different material bases, silicon on insulator (SOI) and polymers. In both cases the waveguides are based on the oversized rib waveguide concept and utilize silicon as a substrate. Two possible fabrication processes for this passive fiber chip coupling IN or ON silicon are presented and compared. The first approach involves a technology similar to flip chip fabrication using a sub- and superstrate, that allows separate processing of v-grooves for fiber alignment and the integrated optical devices. The self aligned mounting of the chip is achieved by a v-shaped rib-groove combination created by wet chemical etching, where the rib is the exact negative of the groove so that the flip chip is put on precisely defined crystal planes rather than on sensitive edges, which would be the case when using rectangular alignment ribs. The second approach utilizes the same chip for waveguides and fiber alignment structures which makes it possible to define both in the same lithographic step and thereby eliminating any vertical displacement. Processing difficulties arise primarily from completely different processing requirements of fiber aligning v-grooves and integrated waveguides. The need to define patterns of the size of only several microns (μm) in the proximity to deep grooves makes the use of an electrophoretic photoresist necessary that is deposited via galvanic means on the extremely nonplanar surface. Both processes allow for fiber chip alignment precisions in the sub-μm range which was also experimentally verified with coupling losses as low as 0.7 dB per end-face. The fabrication processes along with experimental and theoretical results are presented     

Characterization of special fibers and fiber devices

Methods for characterizing birefringent fibers (both those with high circular or linear birefringence and those with negligible intrinsic birefringence) are presented, and their relative merits are discussed. Fibers with high nonlinear coefficients exhibit interesting optical phenomena, and methods are developed to determine second harmonic, Pockels and Kerr effects, parametric phenomena, and the Verdet constant of silica and higher-loss, nonsilica fibers. Fibers containing rare-earth ions are of interest both as active (laser and amplifiers) and passive systems. Techniques are developed to characterize these devices, and conventional methods are modified to quantify dopant parameters within the fiber. Techniques for the measurement of the diverse properties of all these different fibers are presented with results, and, where appropriate, the problems with their characterization are discussed     

光缆接头盒机械性能试验若干问题的探讨

光缆接头盒是光纤通信线路中不可缺少的部件，它对光纤光缆的连接保护、光缆线路通信质量起重要的作用。为此，探讨了光缆接头盒机械性能试验的若干技术问题，如试样制备、试验条件和程序、设备和试样状态控制，以及与试验判据有关的几个问题。