Title :
Refractive Index Sensing of SMS Fiber Structure Based Mach-Zehnder Interferometer
Author :
Min Shao ; Xueguang Qiao ; Haiwei Fu ; Huidong Li ; Zhenan Jia ; Hong Zhou
Author_Institution :
Shaanxi Key Lab. of Opt. Inf. Technol., Northwestern Polytech. Univ., Xi´an, China
Abstract :
A Mach-Zehnder interferometer based on single-mode-thin-core-multimode-single-mode (STMS) fiber structure for refractive index (RI) measurement is proposed and experimentally demonstrated. It works on the basis of interference between the core mode and cladding mode. Using the multimode fiber core, the transmission spectrum of STMS structure is very sensitive to RI variations of the surrounding medium. The experimental results show that the sensor possesses a high sensitivity of 148.27 nm/RIU in the RI range of 1.333-1.403 and has a good linear response to the SRI.
Keywords :
Mach-Zehnder interferometers; fibre optic sensors; light interference; refractive index measurement; Mach-Zehnder interferometer; SMS fiber structure; cladding mode; core mode; light interference; multimode fiber core; refractive index measurement; refractive index sensing; single-mode-thin-core-multimode-single-mode fiber structure; transmission spectrum; Interference; Optical fiber LAN; Optical fiber dispersion; Optical fiber sensors; Refractive index; Sensitivity; Mach–Zehnder interferometer; multimode fiber core; refractive index sensor; thin-core fiber;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2013.2295375
