Spatial Frequency Multiplexing of Fiber-Optic Interferometric Refractive Index Sensors Based on Graded-Index Multimode Fibers

Sensors

Li Liu¹  Yuan Gong¹  Yu Wu¹  Tian Zhao¹  Hui-Juan Wu¹ 

[1] Key Lab of Optical Fiber Sensing & Communications (Education Ministry of China), University of Electronic Science & Technology of China, Chengdu, Sichuan 611731, China; E-Mails:

关键词: fiber-optic sensors;    graded-index multimode fiber (GI-MMF);    Fabry-Perot sensor;    refractive index sensor;    spatial frequency multiplexing;   

DOI  :  10.3390/s120912377

来源: mdpi

【 摘 要 】

Fiber-optic interferometric sensors based on graded-index multimode fibers have very high refractive-index sensitivity, as we previously demonstrated. In this paper, spatial-frequency multiplexing of this type of fiber-optic refractive index sensors is investigated. It is estimated that multiplexing of more than 10 such sensors is possible. In the multiplexing scheme, one of the sensors is used to investigate the refractive index and temperature responses. The fast Fourier transform (FFT) of the combined reflective spectra is analyzed. The intensity of the FFT spectra is linearly related with the refractive index and is not sensitive to the temperature.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland.