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It it hypothesized a new approach to describe the chromatic dispersion of dispersion -shifted single -mode fibres (DS -SMF). Measurements on a commercial available DS -SMF support this hypothesis. This new approach has interest because it reveals that for both conventional and dispersion-shifted fibres, the same curve shape could be employed to specify the dispersion. INTRODUCCION Xs* AThe mesasuring wavelengths and the fitted coefficients of T5S , TLL and A0 and S0 as well are given in table I.

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