Abstract

We demonstrate a fiber in-line Mach–Zehnder interferometer based on an inner air-cavity with open micro-channel for high-pressure sensing applications. The inner air-cavity is fabricated by combining femtosecond laser micromachining and the fusion splicing technique. The micro-channel is drilled on the top of the inner air-cavity to allow the high-pressure gas to flow in. The fiber in-line device is miniature, robust, and stable in operation and exhibits a high pressure sensitivity of $\sim 8,239\mathrm{pm}/\mathrm{MPa}$.

© 2015 Optical Society of America

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