4.5 Article

Refractive Index Sensing of SMS Fiber Structure Based Mach-Zehnder Interferometer

Journal

IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 26, Issue 5, Pages 437-439

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2013.2295375

Keywords

Mach-Zehnder interferometer; multimode fiber core; thin-core fiber; refractive index sensor

Funding

  1. National Science Foundation of China [F050304, 61240028]
  2. National 863 Project of China [2009AA06Z203]

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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.

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