Measurement of Radiation for Discontinuity Interface of Second Order Fiber Bragg Gratings

• Main Authors: Chih-Liang Tseng, 曾智良
• Other Authors: Nai-Hsiang Sun
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/z6qkez

碩士 === 義守大學 === 電機工程學系 === 106 === In this thesis, we measure and analyze the radiated angle of the second-order photosensitive hydrogen-loaded fiber Bragg gratings (FBGs). The previous researches by our team found that three radiation angles of second-order FBGs are detected, where the three narrow beam divergences angles are 41.4°, 90°, and 133.2°. In this study, we use the stepper motor measurement system developed by our team to measure the radiation angles. The aluminum foil is used to cover the grating region at different positions to observe radiation efficiency versus radiated angles. We explore the position of fiber gratings, Moreover, we verify that the discontinuous interface between grating region and non-grating region causes radiated angles of 41.4° and 133.2°.