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Whats the difference between frequency modulation and phase modulation?

April 26, 2017difference Frequency modulation phase

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Whats the difference between frequency modulation and phase modulation?

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Because of the mathematical relationship between frequency and phase, phase modulation isn’t possible without frequency modulation and vice versa. Phase modulators are used to vary the phase of an optical beam. Sinusoidal phase modulation at a frequency W generates frequency sidebands at multiples of W about the central cw optical frequency, W.