Optical communication coursework
A step index, multimode, silica fibreis found, from measurements, to have a maximum acceptance (conehalf angle) of 6.5°. Calculate the numerical aperture (NA) of thefibre, the coupling efficiency for light from a typical laser diodeand the corresponding refractive index difference between the coreand cladding regions of the fibre. A cladding region refractiveindex of 1.45 should be assumed where necessary.
Make an approximate estimate of thedifference in phase velocity between the slowest and fastest modesin the fibre and comment on the relevance of this difference topulse spreading.
Describe briefly, with the aid ofappropriate diagrams, how
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