Acousto-Optic Modulation Based on a Tilted Fiber Bragg Grating

• Main Authors: KU FAN, 古凡
• Other Authors: LIU, WEN-FUNG
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/hd7ph9

碩士 === 逢甲大學 === 電機工程學系 === 106 === In this thesis, the investigation of the acousto-optic modulation in a tilted fiber Bragg grating is proposed. This configuration in-cludes the use of lead zirconate titanate(Pb(ZrTi)O3, PZT) to achieve the source of acoustic waves in fiber gratings. The operating principle is that the vertical acoustic waves generated by PZT passes through a horizontal fiber grating to create a travelling long period grating on the optical fiber so that the optical fiber grating will superimpose the travelling long period grating to create the acousto-optic modulation for monitoring the coupling between the core mode and the cladding modes. The experimental results demonstrated the acousto-optic modulation in different tilting angles of FBGs with different coupling efficiencies. In the future, this phenomenon can be applied in the FBG vibration sensor to achieve the purpose of measuring the vibration signal.