Abstract

A novel two-mode fiber-optic interferometer employing a liquid-crystal-clad fiber as a modal filter is proposed. The liquid-crystal-clad fiber can guide one of the second-order modes, ${\mathrm{TE}}_{01}$, and leak out the other ${\mathrm{TM}}_{01}$ and ${\mathrm{HE}}_{21}$ modes. Thus two spatial modes, fundamental mode ${\mathrm{HE}}_{11}$ and second-order mode ${\mathrm{TE}}_{01}$ serve as the two arms of the interferometer to detect an external perturbation. The experimental results obtained when this interferometer was used to sense temperatures ranging from 20 to 100 °C are demonstrated.

© 2004 Optical Society of America

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