Question

Difference between coherent and non coherent source

Answer 1

Those sources in which phase difference is always constant with respect to time are called Coherent Sources.

While ,

Those sources in which phase difference changes with time arr called Non-Coherent Sources.

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Hope it was helpful.

Answer 2

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In coherent detection the local carrier generated at the receiver is phase locked with. the carrier at the transmitter. Hence it is also called synchronous detection. In non coherent detection the local carrier generated at the receiver not be phase. Locked with the carrier at the transmitter.