IEVref: | 731-02-22 | ID: | |

Language: | en | Status: Standard | |

Term: | core area | ||

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Definition: | for a cross-section of an optical fibre the area within which the refractive index everywhere (excluding any index dip) exceeds that of the innermost homogeneous cladding by a given fraction of the difference between the maximum of the refractive index of the core and the refractive index of the innermost homogenous cladding
NOTE – The core area is the smallest cross-sectional area of a fibre excluding any index dip, which is contained within the locus of points where the refractive index
where: | ||

Publication date: | 1991-10 | ||

Source | |||

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Internal notes: | 2020-03-31: Editorial maintenance action approved via C00053: replace "cross section" by "cross-section". <i>k</i> corrected to be italic and decimal point replaced by decimal comma in 0.05. JGO | ||

CO remarks: | |||

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Domain1: | |||

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Domain5: |

*n*_{3} = *n*_{2} + *k* (*n*_{1} – *n*_{2})

where:

*n*_{1} is maximum refractive index of the core,

*n*_{2} is refractive index of the innermost homogeneous cladding,

*k* is a constant (usually taken to be in the range 0 – 0,05).