Abstract
A novel cladding-mode-resonance-based polarization-maintaining photonic-crystal-fiber
Sagnac interferometer (PMPCF-SI) and its application for fiber sensor are
demonstrated. By introducing a mode field diameter mismatch at a splicing
joint of an inbuilt single-mode fiber (SMF)-PMPCF-SMF structure connected
in an SI, an intermodal interference is constructed by the excited cladding
modes and the polarization modes of the PMPCF. With such a PMPCF-SI, simultaneous
strain and temperature measurements are demonstrated. The SI behaves as a
sensor and a filter simultaneously. By measuring the wavelength variation
and transmissivity difference between two almost symmetrical resonance peaks
in the spectral response of the SI, simultaneous strain and temperature measurements
are achieved.
© 2011 IEEE
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