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A new depressed-clad triangular-index-profile single-mode fibre with dispersion minimum shifted to the 1.55 μm region is investigated. Fibres with high cutoff wavelength (≃1.1 μm) and low dispersion slope (≃0.052 ps/km nm2) at their minimum dispersion wavelength (≃1.55 μm) were fabricated. Results from 226.7 km of fibre show an average loss of 0.241 dB/km at 1.55 μm and 0.232 dB/km at the loss minimum.
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Shang et al. (1985) studied this question.
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