Calculate the difference in phase velocity between the slowest and fastest modes in the fibre and comment on the relevance of this difference to pulse spreading. Describe briefly, with the aid of appropriate diagrams, how the dielectric polarisation of a general material varies with frequency. Identify the contributions from the various forms of resonant absorption shown by the medium.
Calculate the difference in phase velocity between the slowest and fastest modes in the fibre and comment on the relevance of this difference to pulse spreading. Describe briefly, with the aid of appropriate diagrams, how the dielectric polarisation of a general material varies with frequency. Identify the contributions from the various forms of resonant absorption shown by the medium.
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Transcribed Image Text:Calculate the difference in phase velocity between the slowest and fastest modes in the fibre
and comment on the relevance of this difference to pulse spreading.
Describe briefly, with the aid of appropriate diagrams, how the dielectric polarisation of a
general material varies with frequency. Identify the contributions from the various forms of
resonant absorption shown by the medium.
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