The sensitivity to hydrostatic pressure, temperature, and strain of elliptical-core, D-shaped, bow-tie highly birefringent fibers is experimentally investigated. Both polarimetric and polarization sensitive LP01–LP11 intermodal interferometric responses are studied. The sensitivities are expressed in terms of the experimental parameters Tx,j describing a 2π phase shift in the cosine response. It is found that bow-tie fibers exhibit a linear response to all the studied external perturbations except for the polarimetric response of the fundamental mode to temperature, while elliptical-core and D-shaped fibers are characterized by a nonlinear sensitivity to both temperature and hydrostatic pressure. The application to fiber-optic sensors of each type of fiber is discussed.
© 1993 Optical Society of America
Wojtek J. Bock and Tinko A. Eftimov, "Polarimetric and intermodal interference sensitivity to hydrostatic pressure, temperature, and strain of highly birefringent optical fibers," Opt. Lett. 18, 1979-1981 (1993)