Abstract

A new fiber in-line Mach–Zehnder interferometer based on a straight waveguide along the central axis of the no-core fiber sandwiched between single mode fibers is fabricated by a femtosecond laser. The device can be used for high temperature sensing with a sensitivity of $-278.86\mathrm{pm}/°\mathrm{C}$ and for bending sensing with a sensitivity of $0.28\mathrm{nm}/{\mathrm{m}}^{-1}$. The high mechanical strength, simple fabrication, and precisely controlled free spectral range make the device attractive for potential applications in high temperature monitoring.

© 2018 Optical Society of America

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