Communication Systems
Which of the following does not cause losses in optical fibre cables?

Stepped index operation
Microbending
Attenuation in glass
Impurities

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Communication Systems
In case of frequency modulation, modulating voltage remains constant if the modulating frequency is lowered, then

Amplitude of distant sidebands increases
Amplitude of distant sidebands first increases, then decreases
Amplitude of distant sidebands remains constant
Amplitude of distant sidebands decreases

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