Spectral dependence of sensitivity of highly birefringent fibers to temperature, elongation and hydrostatic pressure

Interferometric measurement method was presented which allows for determining spectral dependence of sensitivity of modal birefringence in highly birefringent fibers to temperature, elongation and hydrostatic pressure. Modal birefringence was also measured versus wavelength for investigated fibers. Measurements were carried out for two elliptical core fibers and one fiber with stress induced birefringence in the spectral range from 630 nm to 840 nm. Strong wavelength dependence of modal birefringence and its sensitivity to external parameters was detected in elliptical core fibers. In the fiber with stress-induced birefringence wavelength dependence of all fiber characteristics was much lower.