Temperature sensor based on highly germanium-doped fiber with rounded tip

Lifeng Bao; Xinyong Dong; Perry Ping Shum; Changyu Shen

doi:10.1117/12.2505585

12 December 2018 Temperature sensor based on highly germanium-doped fiber with rounded tip

Lifeng Bao, Xinyong Dong, Perry Ping Shum, Changyu Shen

Proceedings Volume 10849, Fiber Optic Sensing and Optical Communication; 1084918 (2018) https://doi.org/10.1117/12.2505585
Event: International Symposium on Optoelectronic Technology and Application 2018, 2018, Beijing, China

Abstract

A compact temperature sensor with highly germanium-doped fiber (Ge-fiber) is experimentally demonstrated. It is based on an in-line Michelson interferometer, which is constructed by splicing a 1mm-long, 75 mol.% GeO₂-doped fiber to a single mode fiber (SMF) and fusing the tip into rounded shape. Since the differential refractive index of the Ge-fiber is much higher than that of normal fibers, length of the proposed sensor probe has been greatly reduced. The rounded surface provides as a concave mirror to enhance the reflection, thus leads to a high extinction ratio to the interference fringes. By monitoring wavelength shift of the reflection spectrum, temperature measurement was realized with a high sensitivity of 89.5 pm/°C, which is much higher than normal fiber based MI sensors owing to higher thermo-optic coefficient of the Ge-fiber. The advantages of the sensor are its compact size, facile fabrication and high sensitivity, which make it a potential candidate in point measurement of temperature.

Citation Download Citation

Lifeng Bao, Xinyong Dong, Perry Ping Shum, and Changyu Shen "Temperature sensor based on highly germanium-doped fiber with rounded tip", Proc. SPIE 10849, Fiber Optic Sensing and Optical Communication, 1084918 (12 December 2018); https://doi.org/10.1117/12.2505585

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