Sensitivity of Bragg grating imprinted in a three-mode elliptical core fiber to temperature and to strain

Sensing characteristics of Bragg grating imprinted in a three-mode elliptical core fiber were investigated in details. The grating sensitivities to temperature and to strain were measured for each polarization and spatial mode. The experimental results show that the grating sensitivity to temperature and strain is almost identical for all modes. We also modeled the sensitivity of the host elliptical core fiber to these two parameters. We noticed relatively good agreement between the sensitivities of the grating determined in our experiment and the calculated sensitivities of the host fiber for respective modes.