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標題: Adiabatic Fiber Taper with Incorporated an Air-gap Microcavity Fiber Fabry-Perot Interferometer
作者: Ching-I Tai
關鍵字: Adiabatic tapered fibers;Fiber Fabry-Perot interferometer;緩變錐形熔拉光纖;Fabry-Perot光纖干涉儀
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This study proposes a novel and sensitive fiber-optic sensor with valuable application. The sensing mechanism of the fiber sensor is based on an adiabatic single-mode fiber taper whose tapered waist is under a material dispersion control to make the effective index and the propagation characteristics of the fundamental-mode change. It was further incorporated with a simply probe-typed Fabry-Perot interferometer (FFPT) to form a hybrid device that has unique and highly sensitive characteristics of spectrum interference under such the dispersion control.
The study has verified that the spectrum of the interference peak power attenuation and material dispersion with varied temperature (T) were significantly changed. The sensing characteristics were highly sensitive by monitoring the power of optical interference fringes at a particular wavelength when measuring the temperature and refractive index of the surrounding. A high sensitivity of +3.65dB/°C to temperature (corresponding the refractive index sensitivity is +9759dB/RIU) has been achieved by the proposed hybrid configuration. Therefore, it can be predicated that a low cost narrowband light source such as a LED or LD would be utilized to replace the expensive broadband light source. Furthermore, the optical spectrum analyzer (OSA) also can be replaced by a photodetector (PD). These advantages are very useful with the great merits for the optical fiber sensing technology.

經實驗證實,本元件能在監控某一特定波長下之干涉條紋,頻譜之干涉峰值功率衰減與材料色散之溫度調變具有非常明顯的變化與感測能力,可用來量測環境的溫度或折射率變化,當監控某一波長峰值功率時,溫度靈敏度可高達到+3.65dB/°C(對應折射率靈敏度為+9759dB/RIU)。因此,若參數感測機制只需監控干涉光頻譜的某一峰值波長時,則預期可以利用一個便宜的窄頻光源例如: LED或LD,可以取代昂貴的寬頻光源,更可利用光功率計取代光譜分析儀,此特性為本研究最具貢獻之特點,具有應用價值性。
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