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Microstructured optical fibres: Fabrication, properties, and devices.

机译：微结构光纤：制造，性能和设备。

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摘要

In this thesis, several novel microstructured fibre-optic devices are investigated on their designs, fabrication techniques, characteristics, and applications. Firstly the dependences of the sensitivity and time response on the coating thickness of polyimide-coated fibre Bragg gratings (FBG) as well as factors influencing these properties are revealed. Intelligent sensing of multiple environmental parameters (salinity, saccharinity, and strain) with a single-fibre sensor system is achieved through the use of multiplexed FBGs with coatings of different polymers (acrylate and polyimide) and specifications. Simultaneous measurement of magnitude and direction of deflection using a FBG cantilever sensor with possible temperature compensation is realized based on Optical low-coherence reflectometry, which reveals the internal structure of the sensing FBG in correlation with its optical properties. Secondly, simultaneous wavelength locking and spectral filtering by a FBG embedded polarization maintaining fibre Sagnac loop mirror through temperature, strain, and polarization tuning is accomplished. The system is also applied to perform simultaneous temperature and axial strain measurement. Thirdly, various fibre Mach-Zehnder interferometers (FMZI) are fabricated using different light steering elements (fibre taper and fibre lateral-shifted junction) to form either a double elements (symmetrical and asymmetrical) or triple elements structure. Simultaneous measurement of temperature and refractive index or strain with a fibre Mach-Zehnder interferometry of high sensitivity is realized based on these FMZIs. Fourthly femtosecond laser induced micro-spots are fabricated inside optical fibres and their optical characteristics are investigated. FMZIs consisting of the femtosecond laser induced spot and either a fibre taper or another spot are fabricated for measurement of temperature, strain, and refractive index. Lastly a femtosecond laser microfabrication approach is adopted to create several all-fibre devices such as long period fibre gratings, fibre core mode attenuators, fibre bandpass filter, and fibre mode converter. The method takes advantage of the flexibility of femtosecond laser micromachining and the specifications of these devices which can be arbitrarily modified by changing the femtosecond laser illumination parameters.
机译：本文研究了几种新型的微结构光纤器件的设计，制造技术，特性和应用。首先揭示了灵敏度和时间响应对聚酰亚胺涂层光纤布拉格光栅（FBG）涂层厚度的依赖性以及影响这些性能的因素。通过使用具有不同聚合物（丙烯酸酯和聚酰亚胺）和规格的涂层的多路FBG，可以使用单纤维传感器系统智能感应多个环境参数（盐度，糖度和应变）。基于光学低相干反射技术，使用具有可能的温度补偿功能的FBG悬臂传感器，可以同时测量偏转的幅度和方向，从而揭示了传感FBG的内部结构及其光学特性。其次，通过FBG嵌入式偏振保持光纤Sagnac环形镜通过温度，应变和偏振调谐实现了同时波长锁定和光谱滤波。该系统还适用于执行温度和轴向应变的同时测量。第三，使用不同的光导元件（光纤锥度和光纤横向移位结）制造各种光纤马赫曾德尔干涉仪（FMZI），以形成双元件（对称和非对称）或三元件结构。基于这些FMZI，可以利用高灵敏度的光纤马赫曾德尔干涉仪同时测量温度，折射率或应变。第四，在光纤内部制作了飞秒激光诱导的微点，并研究了它们的光学特性。制造了由飞秒激光感应光斑和光纤锥度或另一个光斑组成的FMZI，用于测量温度，应变和折射率。最后，采用飞秒激光微细加工的方法来创建几种全光纤设备，例如长周期光纤光栅，光纤纤芯模式衰减器，光纤带通滤波器和光纤模式转换器。该方法利用了飞秒激光微加工的灵活性以及这些设备的规格，可以通过改变飞秒激光照明参数来任意修改。

著录项

  • 作者

    Lu, Ping.;

  • 作者单位

    Memorial University of Newfoundland (Canada).;

  • 授予单位 Memorial University of Newfoundland (Canada).;
  • 学科 Physics Optics.
  • 学位 Ph.D.
  • 年度 2011
  • 页码 208 p.
  • 总页数 208
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 普通生物学;
  • 关键词

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