Modulation is done in

The intensity of light from a continuously emitting laser source operating at 638 nm wavelength is modulated at 1 GHz . The modulation is done by momentarily cutting the intensity off with a frequency of 1 GHz . What is the farthest distance apart two detectors can be placed in the line of the laser light so that they can see the portions of the same pulse simultaneously ? ( consider the speed of light in air 3 xx 10^8 m//s )

Modulators

Modulators

Modulators

What is modulation index in frequency modulation?

What is modulation index in amplitude modulation?

The maximum value of modulation index in case of amplitude modulation system is