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Twin core photonic crystal fiber based temperature sensor with improved sensitivity over a wide range of temperature

机译：Twin core photonic crystal fiber based temperature sensor with improved sensitivity over a wide range of temperature

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摘要

This article presents the twin-core photonic crystal fiber (TC-PCF) for temperature sensing application. The twin solid cores in the cross-section of TC-PCF structure, separated by one vertical elliptical air hole, act as two independent waveguides. This novel arrangement of circular and elliptical air holes in our proposed structure gives an edge over other existing structures to attain high sensitivity. The proposed sensor is highly birefringent and operates on the principle of mode coupling between the two fiber cores. It is practically possible to realize this TC-PCF based temperature sensor by coupling one fiber core to a broadband source on the input end while the other fiber core to an optical spectrum analyzer on the output end. The finite element method has been employed to simulate and quantitatively analyze the proposed TC-PCF temperature sensor. Numerical simulation shows that, the 3 cm long TC-PCF sensor has been optimized to have a high temperature sensitivity of around 21.5 pm/degrees C over a wide temperature sensing range of 0-1200 degrees C. Also the impact of diameter variation of air holes on sensitivity of proposed model is studied.

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