We demonstrate a femtosecond laser microfabricated fiber Mach–Zehnder interferometer and reveal the dependences of the sensitivities of different environmental parameters on the specifications of the interferometer. A 30-mm-long fiber interferometer at a wavelength of $1593\mathrm{nm}$ exhibits a temperature sensitivity of $0.103\mathrm{nm}/°\mathrm{C}$ , axial strain sensitivity of $-1.35\mathrm{pm}/\mathrm{\mu \epsilon }$ , and refractive index sensitivity of $-15.294\mathrm{nm}/\mathrm{RIU}$ , respectively. In addition to dependence on interferometer length, the sensitivities are also strongly dependent on the operation wavelength of the selected interference order. When the operation wavelength is selected at $1525\mathrm{nm}$ , the sensitivities are $0.085\mathrm{nm}/°\mathrm{C}$ , $-0.09\mathrm{pm}/\mathrm{\mu \epsilon }$ , and $-13.824\mathrm{nm}/\mathrm{RIU}$ , respectively.

© 2011 Optical Society of America

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