The group birefringence and chromatic dispersion of a polarisation maintaining bow-tieerbium-doped silica fibre have been measured in the wavelength range 1.2–1.68 μm by an interferometric measurement technique without any polarisers. The group birefringence is lower than that of a conventional bow-tie fibre and the zero dispersion wavelengths of the two polarisation modes are shifted to 1.613 and 1.630 μm.
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Deutsch et al. (1992) studied this question.
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