Title :
Fiber-Optic Fabry–Pérot Sensor Based on Periodic Focusing Effect of Graded-Index Multimode Fibers
Author :
Gong, Yuan ; Guo, Yu ; Rao, Yun-Jiang ; Zhao, Tian ; Wu, Yu
Author_Institution :
Key Lab. of Opt. Fiber Sensing & Commun., Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
In this letter, the periodic focusing effect of graded-index multimode fibers is used to improve the performance of fiberoptic Fabry-Perot (FFP) sensors. The maximum fringe contrast of the reflective spectrum of the FFP sensor in air is >32 dB. By detecting the fringe contrast variation and wavelength shift of the reflective spectrum, such an FFP sensor is used to measure the refractive index and temperature with sensitivities of ~45.05 dB/RIU and 11.5 pm/°C , respectively. It is also verified by the experiment that the simultaneous measurement of refractive index and temperature can be realized.
Keywords :
fibre optic sensors; gradient index optics; optical fibre dispersion; optical focusing; refractive index measurement; spectral line shift; temperature measurement; fiber-optic Fabry-Perot sensor; fringe contrast variation; graded-index multimode fiber; periodic focusing effect; reflective spectrum; refractive index measurement; temperature measurement; wavelength shift; Optical fiber communication; Optical fiber sensors; Optical fibers; Optimized production technology; Refractive index; Temperature measurement; Temperature sensors; Fabry–Pérot; fiber-optic sensors; graded-index multimode fiber (GI-MMF); periodic focusing effect;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2010.2082518
