Abstract

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 1593nm exhibits a temperature sensitivity of 0.103nm/°C, axial strain sensitivity of 1.35pm/με, and refractive index sensitivity of 15.294nm/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 1525nm, the sensitivities are 0.085nm/°C, 0.09pm/με, and 13.824nm/RIU, respectively.

© 2011 Optical Society of America

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