Coherent

Coherent demodulation

Coherent demodulation
  1. What is coherent demodulation?
  2. What is meant by coherent detection?
  3. What is meant by coherent and non coherent detection?
  4. What is a synchronous or coherent demodulator?

What is coherent demodulation?

Coherent demodulation consists in multiplying the received signal with a sinusoid of the same frequency and phase of the carrier. A local oscillator generates this sinusoid.

What is meant by coherent detection?

Coherent detection originates from radio communications, where a local carrier mixes with the received radio frequency (RF) signal to generate a product term. As a result, the received RF signal can be frequency translated and demodulated.

What is meant by coherent and non coherent detection?

Non-coherent means optical transmission system does not require coherent local oscillator light; Coherent means optical transmission system that uses local oscillator light for coherent detection.

What is a synchronous or coherent demodulator?

For synchronous demodulation, a mixer is used. The incoming signal is fed into the signal input of the mixer, and a local oscillator signal on the same frequency as the carrier of the incoming signal is fed into the other.

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