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IEVref:731-02-22ID:
Language:enStatus: 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 n3 is given by :

n3 = n2 + k (n1n2)

where :
n1 is maximum refractive index of the core,
n2 is refractive index of the innermost homogeneous cladding,
k is a constant (usually taken to be in the range 0 – 0.05).


Publication date:1991-10
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