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Miniaturized fiber in-line Mach–Zehnder interferometer based on inner air cavity for high-temperature sensing

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Abstract

We demonstrate a miniaturized fiber in-line Mach–Zehnder interferometer based on an inner air cavity adjacent to the fiber core for high-temperature sensing. The inner air cavity is fabricated by femtosecond laser micromachining and the fusion splicing technique. Such a device is robust and insensitive to ambient refractive index change, and has high temperature sensitivity of 43.2pm/°C, up to 1000°C, and low cross sensitivity to strain.

© 2012 Optical Society of America

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