Abstract: Spectral properties of two elliptical core fibers were investigated using interferometric methods. Phase and group modal birefringences were measured versus wavelength in the spectral range from 633 nm to 830 nm. We also measured sensitivity of phase and group modal birefringence to temperature and hydrostatic pressure in the same spectral range. Strong wavelength dependence of modal birefringence and its sensitivity to external parameters was detected in investigated fibers.!4
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