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What is different in case of cross-phase modulation from self-phase modulation?

What is different in case of cross-phase modulation from self-phase modulation? Correct Answer Overlapping but distinguishable pulses

In cross phase modulation, variation in intensity of one pulse width modulates the refractive index of the fiber which causes phase modulation of the overlapping phases. In self-phase modulation, this phase modulation broadens the pulse spectrum.

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