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Simultaneous measurement of temperature and strain was demonstrated using a polarization-maintaining few-mode Bragg grating (PM-FMF-FBG) based on the wavelength and phase modulation of the even L P 11 mode. The wavelength shift sensitivity and the interrogated phase sensitivity of the temperature and strain were measured to be 10 pm·°C -1 and 0.73 pm·με -1 and -3.2 × 10 -2 rad·°C -1 and 4 × 10 -4 rad·με -1 , respectively, with a discrimination efficiency of 98%. The polarization interference led to selective polarization excitation of the reflection spectra, and the calculated phase sensitivity agreed with the experimental results.

Simultaneous Temperature and Strain Measurements Using Polarization-Maintaining Few-Mode Bragg Gratings