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Fabrication and development of carbon dioxide laser-written long period fiber grating and its application to vibration measurement.

机译：二氧化碳激光笔迹长周期光纤光栅的研制与开发及其在振动测量中的应用。

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摘要

Development of fiber gratings in has lead to its application as a narrowband filter in dense wavelength division multiplexing (DWDM) optical networks in optical communication, as well as sensors capable of detecting temperature, strain, displacement and other parameters. In this dissertation, a class of fiber grating called long period grating (LPG) fabricated by periodic perturbation via CO2 laser is introduced. The fabrication process and characterization of such device is discussed. By cascading the CO2-written LPG within an acoustic-optic tunable fiber (AOTF), a tunable band-pass filter, as well as a vibration sensor is built and demonstrated. The operating principle of both devices, which is based on energy mode coupling, is reviewed.;Thru computer automation, a highly compact (1.2 cm) long-period fiber gratings (LPGs) exhibiting strong grating effect (>30dB loss) and low insertion loss (0.25dB) inscribed by a continuously scanned CO2 laser. The LPG resonances are also probed using acousto-optics tunable fiber (AOTF). The results show that these CO2 laser side-exposed LPGs predominantly couple to anti-symmetrical cladding modes.;By utilizing the cascading effect of the LPG-AOTF device described earlier, a compact, all-fiber frequency shifter is shown by cascading a CO2-written long-period grating with a flexural acoustic wave induced micro-bending grating on a single-mode fiber. Carrier and image sideband suppression of 30.0 and 28.1dB, respectively, are measured. An all-fiber vibrometer based on this frequency shifter capable of nanometer resolution at frequencies up to MHz is also demonstrated.;In addition, an efficient thermally controlled loss-tunable LPG is fabricated by bonding an etched fiber onto a periodic-corrugated metal fixture. The attenuation is thermally tuned using a thermo-electric cooler. At a fiber diameter of 52mum, a 25dB change in transmission is achieved with a change of temperature of 18°C. Also by fusion splicing a 3.25mm long two-mode fiber sandwiched between two single mode fibers to form an all-fiber Mach-Zehnder interferometer, a fiber sensor is developed capable of detecting temperature change from ambient to 425°C with temperature sensitivity of 58pm/°C, and 0.45muW/°C with 360muW of input power, respectively.
机译：光纤光栅的发展已经导致其在光通信中的密集波分复用（DWDM）光网络中用作窄带滤波器，以及能够检测温度，应变，位移和其他参数的传感器。本文介绍了一种通过周期性的CO2激光扰动制造的称为长周期光栅（LPG）的光纤光栅。讨论了这种装置的制造过程和特性。通过将写有CO2的LPG级联在声光可调光纤（AOTF）中，可调谐带通滤波器以及振动传感器得以构建和演示。回顾了两种基于能量模式耦合的设备的工作原理。通过计算机自动化，高度紧凑（1.2厘米）的长周期光纤光栅（LPG）表现出强大的光栅效应（损耗> 30dB）和低插入连续扫描的CO2激光造成的损耗（<0.25dB）。还使用声光可调光纤（AOTF）探测LPG共振。结果表明，这些CO2激光器侧面暴露的LPG主要耦合到反对称包层模式。;通过利用前面所述的LPG-AOTF设备的级联效应，可以通过级联CO2-来显示一种紧凑的全光纤移频器在单模光纤上用挠曲声波诱导的微弯曲光栅编写的长周期光栅。测得的载波和图像边带抑制分别为30.0和28.1dB。还展示了基于这种移频器的全光纤振动计，该频率计能够在高达MHz的频率下具有纳米分辨率。此外，通过将蚀刻的光纤粘合到周期性波纹金属夹具上，可以制造出一种有效的热控损耗可调LPG。使用热电冷却器对衰减进行热调谐。在直径为52μm的光纤上，温度变化18°C时，传输变化达到25dB。此外，通过将夹在两个单模光纤之间的3.25mm长的双模光纤熔融拼接以形成全光纤Mach-Zehnder干涉仪，开发了一种光纤传感器，能够检测温度从环境温度到425°C的变化，温度灵敏度为58pm /°C和0.45muW /°C，分别具有360μW的输入功率。

著录项

  • 作者

    Chan, Hon Man.;

  • 作者单位

    University of California, Irvine.;

  • 授予单位 University of California, Irvine.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 109 p.
  • 总页数 109
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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