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Explain about the single mode fibres in intermodal dispersion.
Into single mode fibers, the core size of the fibre is decreased to 3 to 9µm so that this supports simply axial modes, or consistently only one mode of travel (nevertheless both polarizations). Such fibers have V number less than 2.405 at the operating wavelength which is single mode operation, as
V = 2Πa/λ (√(n12 - n22)) = (2Πa/λ) < 2.405
Single mode fibers have negligible intermodal dispersion.
Single mode fibres in intermodal dispersion
Rayleigh-Jeans law For any blackbody at thermodynamic temperature T, the radiancy R onto a range of frequencies among nu & nu + dnu is provided by R = 2 pi nu 2 k T/c 2 .
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"It is explaining that at similar temperature and pressure equivalent volumes of all gases contain similar number of molecules".
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