一种新型的低损耗激光单模光纤耦合器

本文报导了一种新型低损耗单模光纤的光学耦合器，叙述了应用光线矩阵法和梯度光学理论的设计方法，同时，从理论上讨论了耦合特性。     

光纤耦合波导器件中光波导深度的研究

声光波导光开关可以作为高速光通信网络中的开关器件,其中光纤-器件对接耦合损耗大是影响其性能的主要因素.从光波导模场椭圆度和不对称度对模场失配引起的耦合损耗出发,计算Ti:LiNbO3波导与光纤耦合损耗最小时对应的最佳Ti离子扩散深度.分析得到不同切型的Ti:LiNbO3,波导中扩散深度、光纤模场半径对耦合损耗的影响.结果表明,y切Ti:LiNbO3波导耦合损耗约为z切波导的3倍.研究结果为共面型声光波导调制器中光波导制作参数的设计提供帮助.     

SOI基波导与光纤耦合的进展研究

当前以电子作为信息载体的微电子技术遭遇到发展瓶颈。光传输具有带宽大、速率高的特点,将光子载体与电子载体相结合是未来信息传输发展的必然趋势。波导与光纤的高效耦合是实现光电子集成的关键。文章介绍了国内外几种典型耦合器的最新进展,包括楔形耦合器、GRIN(渐变折射率)透镜耦合器和垂直光栅耦合器,并对它们的性能指标、优缺点进行了比较分析,对进一步提高耦合效率的可行性进行了展望。结果表明,垂直光栅耦合器具有耦合效率高、带宽大、工艺成熟、工艺容差大和耦合步骤简单的优势,在光通信与集成光电子学领域有着广阔的应用前景。     

衍射器件实现单模光纤与光波导低损耗耦合

提出了一种集成化衍射光学模式转换器。利用衍射光学器件(DOE)实现模式转换，消除模式失配，实现单模光纤(SMF)与光波导的低损耗耦合。DOE的相位分布由数值迭代相位恢复算法优化得到。在迭代算法中引入一种新的混和远场约束，达到很高的模式转换质量。此方案适用于任何波导结构。分别针对不同尺寸及不同折射率对比度的方形波导、薄膜波导和脊形波导进行了设计，耦合损耗均降至0.12dB以下。     

光纤偏移对空间光-单模光纤耦合效率的影响

空间光-单模光纤耦合的关键技术是怎样确保耦合系统中光纤的准确定位。基于电磁场模场匹配理论,讨论了光纤偏移对空间光-单模光纤耦合效率的影响,结果显示耦合效率随着光纤偏移的增大显著下降。采用光纤调整架以及微透镜光纤可以显著改善耦合效率,讨论结果有助于空间光-单模光纤耦合器件的优化设计。     

单模光纤与SOI纳米线波导耦合设计

波导光栅在集成光学发展中扮演着重要的角色。与其他的耦合方法相比,光栅耦合器具有耦合效率高、制备封装成本低、无需芯片端面抛光、可以在任何地方实现信号输入输出等优点,成为纳米光波导最有潜力的耦合方法。本文提出利用OPTIFDTD软件仿真结合MATLAB编程的方法精确计算光栅耦合效率的新方法。仿真分析了光栅的周期、槽深、占空比、SiO2层厚度等光栅参数对耦合效率的影响,并给出了使输入光栅耦合器耦合效率达到42.6%;输出光栅耦合器的耦合效率达到72.3%的一组最佳光栅参数。     

光纤与波导的对接耦合

本文报道了利用Ｓｉ单晶各向异性的特点，在两块Ｓｉ单晶片上，择优蚀刻出排列形状不同的Ｖ形Ｓｉ槽，通过嵌入Ｖ形槽中的光纤，将间距为６０μｍ的１０个信号耦合到探测器的间距为１０００μｍ的１０个接收面上。     

SLED中熔锥形透镜光纤耦合设计

文章提出一种熔锥形透镜光纤的设计方法,与常用的圆锥形保偏单模光纤相比,熔锥形透镜光纤与超辐射发光二极管(SLED)管芯的耦合效率可由原来的45%提高到60%,工作距离由7 μm达到超过15 μm,且前者的耦合容差远远大于后者.对于新设计的熔锥形透镜光纤,文章还给出了偏移和偏心与耦合效率的关系曲线图.     

LD激光与单模光纤耦合时的失准容忍度分析

本文导出了ＬＤ激光与带端面微透镜的单模光纤直接（ＳＭＦ）耦合时的失准容忍不变量－失准容忍面积。并指出横向与角向的中心失准容忍度分别与ＬＤ的模斑尺寸、ＳＭＦ模斑对应的远场发散角成正比；而横向和角向的最大失准容忍量却分别与ＳＭＦ的模斑尺寸、ＬＤ的远场发散角成正比。最大失准容忍量是中心失准容忍量的Ｋ倍。     

共晶烧结技术的实验研究

随着微波混合集成电路向着高性能、高可靠、小型化、高均一性及低成本方向的发展,对芯片焊接工艺提出了越来越高的要求.本文对几种共晶烧结方法进行了实验比较,讨论了各种方法的适用范围,影响质量的因素并对实验结果进行了简单的讨论.     

Vacuum-Assisted Microfluidic Technique for Fabrication of Guided Wave Devices

We report on a novel vacuum-assisted microfluidic (VAM) technique for guided wave device fabrication. Ultraviolet curable resins were used to demonstrate the effective VAM waveguide fabrication. Comparisons to a conventional soft molding technique demonstrate that the VAM approach results in lower propagation losses, lower crosstalk, and improved waveguide structures. More importantly, microscope analysis portrays improved device formation, sidewall edges, and the elimination of the polymer background residue inherent to traditional soft molding fabrication techniques. As a low-cost rapid prototyping technique, the VAM soft lithographic method allows guided wave devices to be implemented rapidly and inexpensively.     

平板显示设备贴附技术分析

随着国内平板显示设备日新月异的发展,其生产中的关键技术贴附技术也得到了长足发展。在整个平板显示器的生产过程中,很多地方都用到了贴附技术。由于材料及工艺的不同,选择的贴附方式也不尽相同。针对目前几种常见的贴附技术进行详细分析,提出不同贴附技术的优缺点及注意事项。在实际的生产过程中要根据材料及工艺要求选择合适的贴附技术。     

双包层光纤与抽运光的耦合方式研究

抽运耦合方式是决定光纤激光器／放大器性能的一个重要因素。文中对国内外现有的几种常用的抽运方式和嵌入反射镜侧面抽运耦合方式进行了综述。     

腔失调对模耦合的影响

综合分析了腔失配和腔失调对模耦合的影响，分别讨论了模的功率耦合系数与失配参量、失调位移及失调角的相互关系。     

Foreword to the Special Issue on Optical Guided Wave Technology

This Special Issue of the Journal of Quantum Electronics is the third in a series dedicated to optical guided wave technologies. The first two Special Issues were published in June 1981 and April 1982. The purpose of these three issues was to present the readership with an accurate snapshot of the technology, to illustrate the state-of-the-art and the research trends, and to provide a survey for the IEEE and the Optical Society as to the extent of activity in this field. The continued growth both of R&D and applications of guided wave technology has been made apparent by the responses these special issues. As a consequence of this survey and as result of the expressed interest of the memberships of the IEEE and the Optical Society, a new journal which is entitled, Journal of Lightwave Technology has been established. It is planned that this journal becomes the principal vehicle for the publication of works in guided wave related technologies. During the calendar year 1983, quarterly issues are planned, growing to at least bimonthly issues in 1984. Applications well as technological developments are expected to be covered in this new journal.     

Foreword to the Special Issue on Optical Guided Wave Technology

During the past decade, optical guided wave technology has progressed from a laboratory endeavor to a commercial activity. With guided wave technology, one can realize greatly improved data handling and passive sensing capabilities with completely new devices such as represented by the family of sensors being developed using fiber-optical components. Building upon the substantial technological base developed in the 1970's, long, very high bandwidth unrepeatered links appear possible and will find application in long intercity links and undersea transmission cables. The componentry base already permits implementation of many practical intracity, intrabuilding, and intraplatform (e.g., aircraft, ships) links. A competitive and healthy market has been developed to service these opportunities. Just evolving is the fiber-sensor area in which magnetic, acoustic, gyro, temperature, acceleration, pressure, fluid level, flow, etc., sensors can be fabricated using optical fibers as sensing elements. While this area has not yet transitioned to commercial production, the capabilities demonstrated recently in several laboratories indicate that previously unachievable levels of sensor performance can now be realized, thus ensuring future commercial involvement.     

光纤固定软钎焊焊点的三维形态模拟

本文在建立光纤固定软钎焊焊点模型及能量边界条件的基础上,利用有限元方法对焊点三维形态进行数值模拟并分析材料及结构等参数对焊点形态的影响规律.基于能量最小原理并利用形态模拟数据,得出钎料量及焊盘尺寸对光纤与焊盘间隙高度的影响规律,以及光纤横向偏移量对回复力的影响规律.研究结果表明:针对一定的焊盘相对尺寸,当钎料量大于临界值,最小间隙高度随着钎料量的增加而成线性增加;光纤横向偏移量小于一定值时,回复力随着偏移量的增加成线性增加.研究结果对于通过调整结构及工艺参数来控制光纤对准偏移具有指导意义.     

高功率双包层光纤激光器侧面耦合技术的研究进展

双包层光纤侧面耦合技术将泵浦光从光纤侧面耦合进入内包层,与端面耦合技术相比,更有利于高功率光纤激光器的实现.介绍了角度磨抛、微棱镜、V形槽、内嵌反射镜、衍射光栅多种侧面泵浦耦合技术的结构、原理以及系统性能参数,并分析了各种技术方案中需要解决的问题.