Abstract
This study proposes an inline electric-arc induced Mach-Zehnder interferometer (MZI) in a thinned cladding fiber. The proposed MZI is used for refractive index (RI) sensing. At the diameter of 56μm and the length of 18mm, in the RI of 1.3348–1.3558, the sensitivity is ∼580nm/RIU, that is about 20 times greater than those of taper-based MZI sensors. Temperature characteristics of the MZI are investigated in 50–800°C. It is demonstrated that the proposed MZI is a good choice for high-temperature harsh environment sensing.
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