Abstract
A vector solution is obtained for fields of fundamental modes of an elliptical three-layer optical fibre, which is valid for small ellipticity of boundaries between the layers and for arbitrary differences of core and cladding indices. The modal birefringence is investigated as a function of fibre parameters on the basis of this solution. It is shown that the two-step fibre birefringence is larger than the W-fibre birefringence for equal differences of the core and inner cladding indices. The relationship is inverse for equal differences of the core and outer cladding indices. The correlation between the birefringence value and the effective diameter of the single-mode fibre is discussed.
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Kalosha, V.P., Khapalyuk, A.P. Polarization characteristic calculation of three-layer elliptical single-mode fibres. Opt Quant Electron 17, 253–261 (1985). https://doi.org/10.1007/BF00620450
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DOI: https://doi.org/10.1007/BF00620450