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Abstract
A novel polarization maintaining fiber interferometer based on superimposed Mach–Zehnder and Sagnac interferences is presented. Higher order cladding modes are effectively excited to construct a Mach–Zehnder interference with the low order linear polarized modes in the Sagnac interferometer when fusing the single mode fiber and polarization maintaining fiber with a peanut structure. We also demonstrate its strain and temperature tunability. The Mach–Zehnder resonance peak is strain insensitive while the Sagnac resonance dip is highly sensitive to strain, and the Mach–Zehnder resonance peak exhibits an opposite thermal response compared to the Sagnac resonance dip. This can be applied for dual parameter measurement with high resolutions.
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