Size Effect Analysis and Gas Sensing of Corrugated Long Period Fiber Grating

Autor: Yu-Cheng Zheng, 鄭宇程
Druh dokumentu: 學位論文 ; thesis
Popis: 100
In this paper, we propose the size effect and gas sensor of the etched long period fiber gratings .. The fiber etched process is divided into two parts, one kind of this fabrication is using Buffer Oxide Etch (BOE) that we called Corrugated Long Period Fiber Grating（CLPFG）, another is using Inductive Couple Plasma etcher (ICP) that we called Notched Long Period Fiber Grating（NLPFG）. Using the Buffer Oxide Etch on fiber etching requires the use of SU-8 thick-film photoresist as the etching barrier layer, the researchers focused on the analysis of the spectral characterization of Corrugated Long Period Fiber Gratings with different diameter and different grating period. According to the results of this paper, when the fiber diameter decrease 10μm, the resonant wavelength will red shift about 9.33nm,the R-square is up to 0.974; when the grating period increase 10μm, the resonance wavelength will red shift about 14.8nm, the R-square is up to 0.999. Using the Inductive Couple Plasma etcher on fiber etching requires the use of iron plates as the etching barrier layer, the researchers focused on the analysis of the spectral characterization of Corrugated Long Period Fiber Gratings with different diameter and different grating period. According to the results of this paper, when the fiber diameter decrease 10μm, the resonant wavelength will red shift about 14nm,the R-square is up to 0.926; when the grating period increase 10μm, the resonance wavelength will red shift about 14.4nm,the R-square is up to 0.996. In this paper, the gas sensor based on Corrugated Long Period Fiber Gratings overlaid with the nano-structure layer is presented. When the gas pass through the cavity, gas particles can be attached to the fiber surface and lead to spectral changes. The monitoring result of Nitric oxide (NO) and Carbon dioxide (CO2) can be up to 6dB of change, initially proved effective in terms of gas sensing.
Databáze: Networked Digital Library of Theses & Dissertations
Externí odkaz: