Abstract
It is shown that the dispersion sensitivity to core diameter and to refractive index of the core of ideal broadband-dispersion-compensated single mode fibres can be accurately extracted from optical properties of the cladding material. In SiO2-cladded dispersion flattened fibres, typical sensitivity coefficients are 1.25 ps/km nm and 0.4–0.8 ps/kmnm per percent change in core diameter and core index, respectively.

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