Abstract

A temperature-insensitive microfiber Mach–Zehnder interferometer (MZI) for absolute strain measurement is investigated theoretically and experimentally depending on the diameter of the microfiber. The thermo-optic quantity of the microfiber MZI is effectively controlled by optimizing the diameter of the microfiber within the MZI incorporating an external coating overlay. Consequently, the positive thermal property of the microfiber MZI is successfully compensated by the negative thermo-optic factor of the microfiber resulting in suppression of the temperature sensitivity of the microfiber MZI. The transmission spectra of the microfiber MZI with variations in temperature are converted to the spatial frequency spectra by using the fast Fourier transform. When the diameter of the microfiber is ∼7 μm, the temperature sensitivity of the spatial frequency of the microfiber MZI is dramatically mitigated to be $1.94 \times 10^{-6} \,{\rm nm}^{-1}\cdot ^{\circ}{\rm C}^{-1}$ . We apply the proposed microfiber MZI for absolute strain measurement and its strain sensitivity is measured to be $7.53 \times 10^{-4} \,nm^{-1}\cdot \mu \varepsilon ^{-1}$ in the spatial frequency domain.

© 2016 IEEE

PDF Article

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription