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|Title:||MINIATURIZED FIBER MODAL INTERFEROMETERS AND THEIR APPLICATIONS AS FIBER SENSORS||Authors:||DONG BO||Keywords:||Miniaturized modal interferometer,fiber sensor,fiber down-taper,fiber up-taper,Er-Yb codoped phosphosilicate fiber,photonic bandgap fiber||Issue Date:||6-Aug-2015||Citation:||DONG BO (2015-08-06). MINIATURIZED FIBER MODAL INTERFEROMETERS AND THEIR APPLICATIONS AS FIBER SENSORS. ScholarBank@NUS Repository.||Abstract:||Fiber in-line miniaturized modal interferometers (MMIs) have attracted much attention due to their inherent advantages, such as simple and compact structure, small size, low cost, and easy fabrication, especially, they have wide applications in fiber filters and fiber sensors. In this thesis, four types of MMIs, based on dual single mode fiber (SMF) down-tapers, dual SMF up-tapers, Er-Yb codoped phosphosilicate fiber(EYPF), and ethanol-filled photonic bandgap fiber(PBF), are proposed and demonstrated. Their applications as fiber sensors are investigated theoretically and experimentally. The high extinction ratio (ER) SMF based down-taper MMI is a good candidate as a high-sensitivity temperature sensor. The EYPF down-taper MMI has the specific thermal characteristics. The high ER SMF dual cladding modes up-taper MMI is a good candidate for dual parameters (temperature and strain), micro-displacement, and acoustic pressure measurements. The ethanol-filled PBF based MMI is a good candidate as a high-sensitivity temperature sensor.||URI:||http://scholarbank.nus.edu.sg/handle/10635/121962|
|Appears in Collections:||Ph.D Theses (Open)|
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|Ph.D Thesis Final Dong Bo 071215.pdf||4.54 MB||Adobe PDF|
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