Hello ,

Researcher's saying that "It is really wrong to assume that the cladding index is 1 (ncl=1). The properties of PCFs are exactly different from step-index fibers because of the frequency dependent cladding index".

My question is how to calculate the exact value of cladding refractive index "nclad " when most of the part in cladding is air.

the waveguide is attached

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