Photonic Crystal Fiber Interferometer for Sensing Applications

• Main Authors: Hu, Hao-Teng, 胡顥騰
• Other Authors: Tang, Jaw-Luen
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/68993103092386938861

碩士 === 國立中正大學 === 物理學系暨研究所 === 99 === We have fabricated fiber Mach-Zehnder interferometer (MZI) with 3 types of photonic crystal fiber (PCF) by using arc discharge. We changed the sensing length of the interferometer, and analyzed the properties of the interference spectrum, like fringe visibility, difference of the propagation constant and the fringe distance. The fringe distance, as predicted by theory, was found to be inversely proportional to the sensing length. In the study of refractive index sensing, the sensor resolution of 3 types PCF-MZI are about 10-3 -10-5, and the sensitivity of the PM-1550 type PCF-MZI, the highest among the others, is found to be 1246nm/RIU, and its sensor resolution is 1.17×10-5 RIU. Additionally, a quality factor Q was introduced to determine the quality of a refractive-index sensor. The Q of our PCF-MZIs are from 4 RIU-1 to 550 RIU-1. About strain sensing, the experimental results of the 3 types PCF-MZI show very high linearity, and the sensitivity is between 1.1 pm/με and 2.1 pm/με. We also found that the LMA-10 type PCF-MZI is very insensitive to temperature, therefore, we can neglect the cross-sensitivity of temperature when doing sensing of other physical quantities.