Refractive index contrast, in an optical fiber, is a measure of the relative difference in refractive index of the core and cladding. Refractive index contrast, Δ, is given by Δ = (n12- n22)/(2n12), where n1 is the maximum refractive index in the core and n2 is the refractive index of the homogeneous cladding. Normal optical fibers have very low...
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http://en.wikipedia.org/wiki/Refractive_index_contrast
a measure of the relative difference in refractive index of the core and the cladding of an optical fibre, given by : where n
1 and n
2 are, respectively, the maximum in the core and the refractive index of the innermost homogeneous cladding
Found on
http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=731-02-20
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